The Best Way to Seal with ShinWon

Contents

OUR MISSION STATEMENT

Shin Won Co., Ltd. would like to thank you for your interest in our company. We appreciate your business and will continue to work diligently to earn your business.

Shin Won Co., Ltd. is a learning company that has embraced the challenge to explore and develop a variety of high quality of sealing products for high technological sealing systems and committed to serving you with reliable technical advise and quality service and most of all, a positive "Yes we can ！" attitude. Our mission is to create and introduce advanced total sealing system by maintaining continuous improvement of our staff, product, service. Our future is in our customer's success ！

Basic Seal

1. O-ring

History

An O-ring is a torus or doughnut shaped object, with a circular cross section. Usually made from an elastomer, although such materials as metal or plastic are sometimes used.

The O-ring is the most widely adapted seal in history because of its simplicity, low cost,

ease of installation, and small space requirements without supporting structures. It is suitable for dynamic or static seals within the temperature limits of elastomeric materials. Successful use depends upon proper groove dimensions and selection of the right compound, or from one's prior experience with similar application.

Early O-ring seals were made of natural rubber. This limited usage to water and other fluid that do not deteriorate rubber. Dupont's "Neoprene" of the 1930's and standard Oil Co. of New Jersey's "Perbuna N" of the 1940's helped advance the state of the art by providing oil resistant elastomers that could be made into satisfying Compounds for general use. Since that time, many useful elastomers (Polymers) have been developed to produce O-ring materials that satisfy even higher operating conditions...higher pressures, higher temperatures and better chemical and physical property resistance to more and more unusual and exotic fluid.

Through the years, manufactures have developed thousands of elastomeric O-ring Compounds...... each useful for solving a seal problem. Today, billions O-ring are sealing every conceivable apparatus all over the world, in the air, on land, sea, and in outer space.

Major Classifications

All O-ring seal applications are categorized in terms of relative motion. In situations involving little or no motion relative to the seal, The O-ring application is static. In situations involving reciprocating, rotating, or oscillating motion relative to the seal, the O-ring application is dynamic.

Static seal

A static seal is one in which the metal parts do not move with relation to each other. This is a gasket-type seal, further divided as follows.

Type 1.

Axial squeeze : The squeeze is on the top and bottom of the ring like a flat gasket. The seal is made by bolting the flanges together.

Type 2.

Radial squeeze : The squeeze is between the ID and OD of the ring like that of piston or piston rods. The radial clearance gap influences the pressure that can be sealed.

Dynamic seal

A seal in which one or more parts moves in relation to the O-ring is a dynamic seal, further divided as follows.

Type 1.

Reciprocating seal : Where the rod or piston moves back and forth through or with the O-ring.

Type 2.

Rotary seal : Where a shaft rotates with relation to the O-ring.

Type 3.

Oscillating Seal : Where a shaft turns and return with relation to the O-ring.

(One that combines oscillating and reciprocation motion is classed as an oscillating- reciprocating seal) Sealing a rising valve spindle is an example.

2. O-ring elastomers

1) FKM, FPM(Viton^Ⱂ Viton is DuPont Dow registered name)

Compound of this polymers exhibit excellent resistance to petroleum products, low compression set and high temperature resistance, the low temperature capability is somewhat restricted, however, in some cases the flow temperature sealing capability may be increased by specific requirements of Military Specifications Mil-R83248 and Aerospace Specifications AMS 7278, AMS 7279, and AMS 7280. They are especially good for hard vacuum service and low gas permeability. The normal temperature service range is -20F to +204℃ ∼ +232℃.

 2) Nitrile (NBR)

Compounds of these polymers are the backbone of the O-ring line. Polymers vary from

18% to 50% acrylonitrile content. Resistance to petroleum products increase as acrylonitrile increases : conversely, low temperature flexibility decrease. Government specifications require low acrylonitrile.

Nitrile Compounds can exhibit excellent compression set, tear and abrasion resistance.

Unless especially compounded, they do not have good resistance to ozone, sunlight or

weather. They should be stored near motors or other ozone generating electrical equipment. They should be kept from direct sunlight. Compounds from nitrile rubber can exhibit a temperature range of -54℃ to +149℃, although no one formulation may exhibit the total range.

 3) Ethylene Propylene (EPDM)

This material was introduced in 1961 and found broad acceptance in application requiring excellent resistance to Skydrol and other phosphate ester fluids at higher temperatures. In addition, compounds of this material exhibit excellent resistance to automotive brake fluid and steam. The temperature service range for these compounds is -54℃ to +149℃.

 4) Hydrogenated Nitrile (HNBR)

This material is a highly saturated nitrile. HNBR exhibits excellent abrasion, compression set, tensile strength, and tear properties. Unlike standard nitriles, it exhibits resistance to ozone, sunlight, and other atmospheric conditions. This material also exhibits vastly improved resistance to heat in the 149℃ range and, for short periods, up to 175℃. presently available material exhibits a low temperature range to -40℃.

 5) Slicone (VMQ)

The silicone compounds exhibit the best overall temperature range of all currently available elastomers. Silicones are noted for their excellent heat resistance, and are utilized in applications which exposes seals to high temperature dry heat. They are not recommended for dynamic applications due to their relatively poor tensile and tear strength. They exhibit the best low temperature flexibility of all elastomers and can be used in static applications to -100℃. Silicones should be considered to be non-petroleum resistant, but can be used in specific high aniline point petroleum oils. The temperature service range for silicone compounds is -60℃ to +250℃.
( All silicone formulations do not exhibit the capability of this entire range )

6) Teflex O-ring (FEP/PFA O-ring)

Seamless FEP(Fluorinated Ethylene Propylene), PFA(Perfluoroalkoxy) encapsulated Viton, fluoroelastomer to MIL-R83248 75 DURO or Silicone O-ring.

Primarily intended for static application. Teflex O-Ring are silicone, fluoroelastomer O-Rings encapsulated with FEP or PFA are designed primarily to solve the growing problems of sealing corrosive fluids in industry. Teflex O-Ring combines the best qualities of two materials, FEP or PFA on the outside with its chemical inertness and an elastomer on the inside for resilience. This unique combination forms a superior seal.

For high temperature applications to 260℃, Teflex O-Ring is made with PFA over silicone or fluoroelastomer. PFA has higher mechanical strength than FEP or TFE at elevated temperatures and has excellent crack and stress resistance.

Standard Teflex O-Rings in round cross-sections are manufactured in sizes to AS 568A standards JIS series P/G/V used by industry and the military and conform to most foreign standards. Additional sizes are available from Shin Won in custom applications.

FEP-encapsulated O-Rings are

Chemical resistance of FEP

Low coefficient of friction

Resilience with elastomeric core

Low compression set

Temperature range -60℃ to 205℃

Unlimited sizes

PFA-encapsulated O-Rings ; same as FEP above except,

High temperature applications to +260℃

Higher mechanical strength

Better flex-life

Excellent stress and crack resistance

Longer wearability

Temperature Range

FEP Encapsulated : -60℃ ∼ 205℃

PFA Encapsulated: : -60℃ ∼ 260℃

Sizes & Tolerances

Minimum ID of 10mm to 6000mm or whatever is required in all standard and metric cross-sections. Over 10 different cross-sections from 1.9mm to 10mm. ID tolerances to AS 568 standards and conforming to most foreign standards. Cross-section tolerances to same standards ±0.025mm.

7-1) Metallic O-ring

This O-rings are used when elastomers and other non metallic seals will not seal properly or do not offer the requited reliability for the application, usually as a result of temperatures, pressures, or the environment. This seals are long lasting seals and unlike non-metallic seals, they are not subject to failure due to incompatibility with the environment, out gassing or from deterioration due to age. It is generally fabricated from tubing. Typical tubing material consists of stainless steel or high temperature alloys such as Inconel. These materials are frequently used because they offer resilient properties that enable the seal to "spring Back".

This seals are used as static face type seals and should not be used as a dynamic seal. While the majority of seals are circular, many seals are produced in rectangular racetrack and other various shapes and configurations.

Shin Won high performance seals provides superior performance for most internal, external and axial applications such as:

Pressure : Ultra high vacuum ∼ high pressure 6500 bar

Temperature : - 252℃ ∼ high temperature 1100℃

Because of these capabilities, Shin Won high performance seals are widely used in critical and demanding applications, including :

- Missile & Space systems Nuclear Reactor & Waste containment systems

- Jet engines, Controls, & Instruments Diesel engines

- High temperature Aircraft systems, Chemical, Petrochemical processing systems

Material

Metal O-Ring are produced of metal tube and solid wire material. The material is shaped and welded to rings or other figurations. The O-Ring consists of stainless steel304, 316, 321(-252℃~+260℃), inconel 600(+260℃~+430℃), inconel X-750(+430℃~+980℃) and electroplated with indium(80℃), PTFE(220℃), copper(500℃), silver(800℃), gold(850℃), nickel(980℃).

O-Ring size and Groove dimensions

thickness (mm)	outside dia.(mm)	groove depth	groove width	groove O.D.	groove I.D.	ring tolerance
0.9	6.4 ~ 100	0.60~0.68	1.4	B+0.10/0.20	A-0.10/0.20	±0.08
1.6	16.0 ~ 250	1.15~1.25	2.3	B+0.10/0.20	A-0.10/0.20	±0.08
2.4	25.4 ~ 500	1.80~1.95	3.0	B+0.15/0.25	A-0.15/0.25	±0.13
3.2	50.8 ~ 1000	2.40~2.60	4.0	B+0.20/0.35	A-0.20/0.35	±0.13
4.0	76.2 ~ 1250	3.05~3.25	5.0	B+0.25/0.40	A-0.25/0.40	±0.15
4.8	100 ~ 1500	3.70~3.90	6.2	B+0.25/0.40	A-0.25/0.40	±0.18
6.4	127 ~ 2500	5.00~5.20	8.2	B+0.30/0.50	A-0.30/0.50	±0.20

 
* groove O.D. : for internal pressure, B is max. outside dia.(mm)
* groove I. D. : for external pressure, A is min. inside dia.(mm)

Surface finish

- Ra = 0.4 ㎛, N5 : for uncoated O-Ring

- Ra = 0.8 ~ 2.54 ㎛, N6 ~ N8 : for coated O-Ring

- Ra = 0.4 ㎛, N5 : for gases, vacuum, liquids of low viscosity, water

- Ra = 0.8 ㎛, N5 : for medium

7-2) Metal Boss Seal

Application

Advancements in Aerospace performance has resulted in increased engine temperature for longer distances and at higher altitudes. These demand hydraulic systems that are more reliable while operating at higher pressure. Leakage and loss of pressure caused by the degradation of elastomeric or polymer based seals are a problem and the primary reasons for failure in hydraulic systems. The Boss seal is designed to handle high pressures and temperature for long service cycles.

Material

Boss seals are produced from the high temperature alloy X750 (AMS 5598). A soft on the seal is highly recommended to eliminate galling and fretting between the seal and metallic mating components. Silver plating to the AMS 2410 specification with a thickness of .0025mm is recommended. other plating and coating ; Copper, Gold, Soft Nickel, PTFE.

The Boss seal specifications

Materials : Alloy X750(AMS 5598) Silver (AMS 2410)

Temperature range : -55℃ ∼ +650℃

Pressure : Up to 650 bar

Features

Pressure energized for enhanced sealing

Metallic insert captures seal and ensures proper alignment

7-3) Metallic C-Ring

Pressure fluctuations and heat are constant concerns for designers of aircraft engines, valves, pressure transducers exhaust manifolds and fuel injectors. A combination of these two factors can result in premature failure or short seal life. C-ring seals can help overcome both heat and pressure pulsating sealing problems. Key to the seal's performance is the high spring back characteristic due to the C-shaped construction. These highly resilient seals can be used for internal, external and axial pressure under extreme conditions that preclude the use of gaskets made of organic materials. This uniquely fabricated seal configuration is capable of producing relatively high levels of spring back. The compression of the seal in a controlled groove or between two radial interfaces, produces a counter load, generating an effective sealing action that is ideal for these special application.

Basic design characteristics

C-ring seals will undergo plastic deformation when installed at the 20% recommended compression. These C-ring seals may be reusable in their original cavities or in cavities that are nearly the same depth as the original. C-ring seals have much lower initial flange load requirements than O-rings. However, it is still high enough to provide effective smearing of the plating or coating used on the sealing surfaces. Deflection capability is excellent and it is normally assumed to be about half of the spring back, however, this is a function of the operating conditions and the required leakage rate.

Determining factors in seal selection

In the seal selection process, the designer should always keep in mind the following rules.

- There is a direct relationship between seal O.D. and free height

- Larger free height always provides a better performing, more consistent seal.

The seal selection is a process of optmising design limitation, size, available load, spring back, design requirements and cost.

The most important factors in C-ring seal design are :

- Maximum pressure and direction

- Extreme operating temperature.

- Allowable leakage rate.

- Available flange load.

High performance Metallic seal type :

- Internal pressure

- External pressure

- Axial pressure

Deflection capability

We define this as the ability to continue to seal as the flanges separate under pressures.

This function is related to free height, material type, heat treatment and diameter. All things being equal, the larger the free height the more resilient the seal. More resilient seals allow for some tolerance on flanges which are out flat and parallel.

8) Material types, platings and Coatings

It can be made of almost any alloy that can be formed. However, because strength and temperature properties are the primary technical consideration, we produce our seals primarily from Alloy X750 or 718 materials. Other high temperature alloys are also available.

8) Quad-Ring

Description

This seal is used today around the world for a wide variety of static and dynamic sealing

applications, The four-lobed design provides twice the sealing surface of a comparable standard O-ring and because of this double-seal action, less squeeze is required to maintain an effective seal. This reduction in squeeze means less friction and therefore, improved seal life. Unlike O-ring, where parting lines are on the sealing surface, Quad-ring^Ⱂ seals' parting lines lie between the lobes, away from the sealing surface. This design eliminates the problem of leakage often resulting from a parting line's irregular surface. Quad-ring^Ⱂ seals can be used as compression-type seals in high speed rotary applications, eliminating the need for costlier spring-loaded seals. They offer low friction for long life in hydraulic system with speeds of up to 4.5 m/sec.

Advantages

1) With Quad-ring^Ⱂ, the requisite diametrical compression is less than that for O-rings, thus reducing friction and, hence, wear during dynamic application.

2) The four sealing lips give increased sealing efficiency and, at the same time, provide a lubricating groove, which is an added benefit for dynamic sealing applications.

3) The most important is its superior stability during dynamic applications, especially with

reciprocating seals. Where, in specific applications, O-ring roll and twist in the grooves, resulting in accelerated ageing, the Quad-ring^Ⱂ will only slide, which does not affect its sealing performance.

Range of application

Working pressure (for vacuum duties) : up to 50 bar. in connection with PTFE back-up rings 400 bar, for applications at pressures exceeding 50 bar.

Rubbing speed : up to 0.5 m/s, reciprocating

Temperature range : -50℃ ∼ +200℃, depending on type of compound.

In common with O-rins, many Quad-rings are manufactured in conformance with US standard AS568A. The cross section, i.e. the AS number, indicates the relevant size. The Quad-ring order number is made up of the relevant O-ring number plus the prefix. 4.

Installation dimensions for Quad-rings

- In the event of eccentric piston arrangement or rod bending during vacuum and low-pressure applications, the groove diameter can be adjusted.

- If the Quad-ring compound is likely to be subjected to increased swell, the groove width can be enlarged by approx. 15%.

- The groove dimensions for other Quad-ring sizes will be provided upon request.

- After installation, the cross section of the Quad-ring should be compressed approx.10-15%.

- Citical applications and the employment of small cross sections require the degree f compression to be brought in conformity with the tolerance.

9) Chemraz

Description

Perfluorelastomers are fully fluorinated hydrocarbons that can withstand exposure to almost any chemical. Green Tweed has developed 70, 75, 80, 85, 90 and 95 shore A. materials with high temperature performance of +324℃. Chemraz^Ⱂ perfluorelastomers remain flexible to -30℃. Relative to other elastomers, Chemraz^Ⱂ perfluorelastomers exhibit good compression set value. In addition they provide excellent sealing performance in aggressive chemical application.

Chemraz^Ⱂ has the broadest chemical resistance of any elastomeric material. It combines the resilience and sealing force of an elastomer with chemical resistance approaching that of PTFE. Chemraz^Ⱂ o-rings, quad-rings, gaskets and custom elastomeric shapes last longer and seal completely in harsh environments and a wide range of temperatures. Chemraz^Ⱂ is the cost effective solution to the most difficult sealing problems in many industries

Compounds

505 Grade :

-30℃ ~ 220℃. A field proven universal compound having a broader range of chemical resistance than any other single compound on the market. Chemraz^Ⱂ 505 is the elastomer of choice used to seal better than 90% of the most demanding services found in the chemical process and refining industries.

615 Grade :

-18℃ ~ 324℃. The highest temperature perfluoroelastomer on the market. Chemraz^Ⱂ 615 can handle continuous operating temperatures up to 324℃ with outstanding resistance to fatal thermal related compression set.

605 Grade :

-20℃ ~ 260℃. A high temperature compound with superior physical properties and chemical resistance comparable to Chemraz^Ⱂ 505. This compound excels in demanding dynamic applications and exhibits unparalleled performance in high temperature steam and water. Recently received USP Class VI Certification 605.

526 Grade :

-20℃ ~ 260℃. This specialty black compound was formulated for incredible resistance to explosive decompression damage common in high pressure gas services. Chemraz^Ⱂ 526 is also used in monomer services where polymerization attacks and ruptures common elastomeric seals.

584, 585 Grade :

-30℃ ~ 220℃. These specialty cream Chermaz^Ⱂ compounds are formulated to withstand the most demanding chemical process applications. Chemraz^Ⱂ 584 and 585 are the elastomers of choice for strong oxidation fluids and hot aqueous solutions.

517 Grade :

-30℃ ~ 220℃. The white industrial compounds are for applications where contamination from carbon black must be prevented.

Quality by design

Our quality philosophy is based upon reducing process variation at all levels. What's more, quality is designed into the product from the very beginning, and a clear understanding of customer quality requirements in the basis of our process design. From initial concept design to production and delivery. Our employees all have a common goal: customer satisfaction. We are dedicated to working with our customers to establish clear quality requirements for both functional and dimensional characteristics our organization. All of our facilities are ISO 9001, UL certified.

Piston Seal

1. Eriflon^Ⱂ Piston Seal

Eriflon^Ⱂ piston seal, whose outstanding features include minimum friction and compact installation dimensions, find successful application in the fields hydraulic, pneumatic & mechanical engineering.

The seals consisted of two separate components ;

- An Eriflon^Ⱂ seal serving as dynamic element.

- A rubber back-up ring serving as a static seal between the Eriflon seal and the groove.

The preload pressure of the Eriflon^Ⱂ seal and that of the rubber ring in the groove ensure that the Eriflon^Ⱂ seal is made to contact the mating surface, with its sealing performance increasing as the hydraulic pressure rises.

Eriflon^Ⱂ is modified PTFE compound featuring excellent wear resistance and sealing characteristic. The compound has an extremely low friction coefficient and high chemical resistance. It's resistance to high temperature is very good, too. By using different fillers, the Eriflon^Ⱂ compounds can be specially suited to specific operating conditions, thus rendering Eriflon^Ⱂ seals eminently suitable for applications where friction should be minimized or where the lubricating conditions are minimal.

As regards the profile, a distinction is made between :

- double acting piston seal : Eriflon^Ⱂ PDA seal

- single acting piston seal : Eriflon^Ⱂ PSA seal

Range of application

- Operating pressure : 80 MPa (800 bar)

- Surface speed : 15 m/s (reciprocating)

- Temperature : -54℃ ∼ +250℃, depending on O-ring compound

Surface finish

A profor finish of the surface against which the Eriflon^Ⱂ seal is to seal is essential.

A rough surface causes increased friction and, in addition, accelerated wear.

- Running surface Ra 0.1~0.3 Rt 1~3

- Groove bottom < 1.8 < 10

- Groove walls < 3 < 16

Friction

Initial service of the Eriflon^Ⱂ seals will cause a minute friction of PTFE to be deposited in the machining grooves of the mating surface, which will reduce the seal friction even more.

Installation data

When fitting Eriflon^Ⱂ seals, care should be taken to ensure that the proper fits are used and that proper rod and cylinder lead-in chamfers have been provided.

Care should also be taken to ensure that ;

- parts and tools with sharp edges are avoided

- keyways and threads are covered

- any dust, dirt and machining chips have been removed

- if permitted, thin oil can be used to facilitate installation.

The Eriflon^Ⱂ seal can be made more supple by heating it in water 80℃ or oil 120℃

Installation

Eriflon^Ⱂ piston and rod seals can be easily fitted to one-piece pistons and in closed grooves. during installation, the compound can be immediately deformed and compressed : it will recover its original shape within 24 hours. If this period is too long, the ring's recovery to its original shape can be accelerated with the help of a calibrating sleeve. Expansion and compression of the ring can be repeated several times without affecting the condition to the ERIFLON^Ⱂ compound.

2. U-CUP

Material

- Polyurethane (PUR) 93 sh.A

- Colour : Blue

Field of application

- Field of application : Hydraulic cylinder and other hydraulic application

- Motion : Linear alternative movement

- Media : Mineral oils (DIN 51 524)

Hydraulic fluids (HFA, HFB, HFC)

Conditions of use

- Pressure : up to 300 bar ( or more on request )

- Temperature : from -30C to +100C for mineral oils

up to +40C for hydraulic fluids

- Surface speed : up to 0.5 m/s

ROD SEAL

1. Eriflon^Ⱂ Rod Seal

Eriflon^Ⱂ rod seal, whose outstanding features include minimum friction and compact installation dimensions, find successful application in the fields hydraulic, pneumatic & mechanical engineering.

The seals consisted of two separate components ;

- An Eriflon^Ⱂ seal serving as dynamic element.

- A rubber back-up ring serving as a static seal between the Eriflon seal and the groove.

The preload pressure of the Eriflon^Ⱂ seal and that of the rubber ring in the groove ensure that the Eriflon^Ⱂ seal is made to contact the mating surface, with its sealing performance increasing as the hydraulic pressure rises.

Eriflon^Ⱂ is modified PTFE compound featuring excellent wear resistance and sealing characteristic. The compound has an extremely low friction coefficient and high chemical resistance. Its resistance to high temperature is very good, too. By using different fillers, the Eriflon^Ⱂ compounds can be specially suited to specific operating conditions, thus rendering Eriflon^Ⱂ seals eminently suitable for applications where friction should be minimized or where the lubricating conditions are minimal.

As regards the profile, a distinction is made between :

- Single acting rod seal ( Eriflon^Ⱂ RSA seal )

- Double acting rod seal ( Eriflon^Ⱂ RDA seal )

Range of application

- Operating pressure : 80 MPa (800 bar)

- Surface speed : 15 m/s (reciprocating)

- Temperature : -54 ℃ ~ +250℃ depending on O-ring compound

Surface finish

A profor finish of the surface against which the Eriflon^Ⱂ seal is to seal is essential.

A rough surface causes increased friction and, in addition, accelerated wear.

- Running surface Ra 0.1 ~ 0.3 Rt 1 ~ 3

- Groove bottom < 1.8 < 10

- Groove walls < 3 < 16

Friction

Initial service of the Eriflon^Ⱂ seals will cause a minute friction of PTFE to be deposited in the machining grooves of the mating surface, which will reduce the seal friction even more.

Installation data

When fitting Eriflon^Ⱂ seals, care should be taken to ensure that the proper fits are used and that proper rod and cylinder lead-in chambers have been provided.

Care should also be taken to ensure that ;

- parts and tools with sharp edges are avoided

- key ways and threads are covered

- any dust, dirt and machining chips have been removed

- if permitted, thin oil can be used to facilitate installation.

The Eriflon^Ⱂ seal can be made more supple by heating it in water (80C) or oil(120C)

Installation

Eriflon^Ⱂ piston and rod seals can be easily fitted to one-piece pistons and in closed grooves.

During installation, the compound can be immediately deformed and compressed : it will recover its original shape within 24 hours. If this period is too long, the ring's recovery to its original shape can be accelerated with the help of a calibrating sleeve.

Expansion and compression of the ring can be repeated several times without affecting the condition to the ERIFLON^Ⱂ compound.

2. U-CUP

Material

- Polyurethane (PUR) 93 sh.A

- Colour : Blue

Field of application

- Field of application : Hydraulic cylinder and other hydraulic application

- Motion : Linear alternative movement

- Media : Mineral oils (DIN 51 524)

Hydraulic fluids (HFA, HFB, HFC)

Conditions of use

- Pressure : up to 300 bar ( or more on request )

- Temperature : from -30C to +100C for mineral oils up to +40C for hydraulic fluids

- Surface speed : up to 0.5 m/s

Wiper Seal

1. DAS Wiper

Description

Wiper rings are used to protect seals, preventing contamination from dirt particles, dust, mud, water, etc. The lip of the wiper removes even the first dirt from the piston rod. Such dirt particles can cause damage to hydraulic or pneumatic systems during stroke movement. Even if they appear in good condition, wipers should always be replaced when changing seals.

Many applications are :

- earth moving equipments

- lift trucks

- hydraulic presses

Standard Seal Type

1) DAS : with ground outer metal housing

2) DP6 : without metal insert

3) DP7 : with rubber covered metal insert

4) DP8 : without metal insert, special profile

5) DRS : with rubber covered metal insert

6) DWR : without metal insert, inch sizes

7) DK17 : with two flexible lips without metal insert

< Interchange Table >

2. Eriflon wiper

The Eriflon wiper is used for high temperature applications in combination with NBR or Viton O-ring. Also for use in aggressive fluids or in relations with low friction or high speed.

Type : 930 type & 920 type

Advantage : Extremely abrasion-resistant

Very good external and internal wiping effect.

Operating range : speed, max. 15 m/s.

Temp. - -50℃ ~ +200℃

WEAR RING / BEARING

The proper performance of sealing elements depends to a great extent on the proper guidance of the piston rod in the cylinder. In the field of hydraulic and pneumatic engineering, metal guides are increasingly being replaced by plastic guides. Two types can be selected.

1. ER-39 Wear-Ring ; Eriflon PTFE compound

Supplied in rolls, this guide strip is cut to size during installation. Guide rings made of Eriflon PTFE guide strip, which also have excellent anti-friction properties under dry-running conditions, offer low-cost application.

- Permanent, relatively very low friction during operation when used as rod and / or piston guides.

-Virtually no static friction, requiring minimum force during start-up.

- Continued lubrication efficiency, if thin media are employed or if lubrication by the medium is inadequate.

2. ACM Wear-Ring ; Acetal based compound

We have developed a range of advanced composites. These are fibre reinforced plastic laminates which are ideally suited to highly loaded bearing applications in a variety of environments. The material is available in tube and sheet form as well as in fully finished components such as bushes, tubes, washers, wear rings, sphericals, wear pads, wear strip, spherical bearings, bridge bearings and wear rings. We also supply custom components such as our new spherical bridge bearings. ACM offers real advantages over traditional bearing materials such as nylon, phosphor bronze, phenolic asbestos and even hardened steel.

When you talk to ACM about your application requirements, you will get technical advice you can rely on. If there are any problems we will tell you. We only put ACM into successful applications and at ACM, good advice comes before a sale! These rings are made to size with a straight cut and allow ease of installation. The pressure resistance of POM is higher than that of Eriflon guide strip, but slightly lower than that of laminated-cloth guide rings. POM guide rings are characterized by low friction, high dimensional stability and high wear resistance. The wear resistance is often superior to that of a metal guide.

Density ; All approximately 1.3 g/cc unless used with metallic fillers or modifying additives.

Nominal Composite Hardness - All approximately 100 Rockwell M unless used with metallic fillers or modifying additives.

ROTARY SEAL

1. Oil Seal, Rotary shaft seal

type ( in accordance with DIN 3760 )

- A : Rubber covered O.D., metal insert, sealing lip with garter spring

- AS : Rubber covered O.D., metal insert, sealing lip with garter spring and additional dust lip

- B : Outer metal case, sealing lip with garter spring

- BS : Outer metal case, sealing lip with garter spring and additional dust lip

- C : Outer metal case with reinforce cap, sealing lip with garter spring

- CS : Outer metal case with reinforcing cap, sealing lip with garter spring and

additional dust lip

A type AS type B type BS type

C type CS type A-DUO DINA seal

Working principle

The area between the sealing edge and the shaft is the most important. The sealing effect is achieved by preloading the sealing lip, making its internal diameter slightly smaller than the shaft diameter. The garter spring ensures constant pressure and maintains the radial force to the shaft, flattering the sealing edge to a defined width. Underneath this flattened area a thin fluid film is formed. its thickness must be between 1 and 3 micron to avoid leakage. The meniscus acts as an interface between the outside air and the fluid. Any break in the meniscus will result in leakage. This can occur if the shaft contains scratches along the seal path.

* Metal case

The metal insert or case is used to give strength and rigidity to the seal.

- Normally it is made of cold rolled steel in accordance with DIN 1624

To avoid rust or chemical attack, stainless steel can be used.

- Chrome Nickel AISI 304(DIN 1.4301-V2A)

- Chrome Nickel Molybdene AISI 316 TI (DIN 1.4571-V4A)

* Garter spring

The garter spring maintains the radial force exerted by the sealing lip around the shaft surface. Normally produced in harmonic spring steel wire C. 72 or stainless steel wire Chrome Nickel AISI 302 (DIN 1.4300). For special application also stainless steel springs in AISI 316 TI(DIN 1.45710V4A) are available. All our standard shaft seals produced in FPM (Viton) compound are fitted with stainless steel spring in AISI 302.

Installation and Operating

* Shaft

The shaft surface finish is of primary importance for efficient sealing and for achieving a useful life. Basically the hardness should increase with increasing peripheral speed. According to DIN 3760 minimum hardness require is 45HRC. At a peripheral speed of 4m/s the hardness should be 55HRC and at 10m/s 60HRC. Lubrication is also very important. Surface finish as specified by DIN 3760 must be R=1 to 4 micron. Rougher surfaces generate higher friction, hence higher temperatures. Machining defects and scratches on the shaft must be avoided. Even very small defects could be sufficient to increase the film thickness, eventually rupturing the meniscus and causing leakage. It is also important to avoid spiral grinding or rectifying marks, because they can cause a pumping effect and leakage.

.

The best working conditions is to have shaft rotating perfectly centered and concentric to the axis of the rotary shaft seal. Obviously this is not possible and inevitably some eccentricity is always present. Therefore the sealing lip must compensate for it. The higher the rotation speed is, the smaller can be the permissible eccentricity which can be compensated by the sealing lip, because the inertia of the sealing lip prevents it from following the shaft movements. It is therefore advisable to install the seal immediately adjacent to the bearing and minimize bearing whip.

Eccentricity between shaft and housing bore must be avoided as much as possible so as to reduce unilateral load(wear) of the sealing lip.

* Housing bore

A good press fit of the shaft seal onto the housing bore is vital. The result is a stable installation. Machining tolerance of the housing bore diameter for rotary shaft seals are H8 according to ISO standards UNI-6388-68.

The maximum surface roughness of the housing according to DIN 3760 is : Rt=16 micron. We recommend the use of a shoulder or a spacer ring against which the seal can be located. Should this not be possible one has to pay special attention that the seal is installed perpendicularly to the shaft axis. To ease installation the entrance of the groove should have a chamfer inclined 5-10 degrees and 1 mm deep for rings up to 10 mm thickness and 1.2 - 1.5 mm deep for rings thicker than 10 mm(See figure below).

Also the mounting end of the shaft should have a chamfer inclined by 15-25 degrees, with rounded and polished edge.

* Lubrication

Lubrication is very important for good functioning of the seal. The sealing lip does not actually run on the shaft directly, but on an oil film, called meniscus. The thickness of the meniscus is usuallly between 1-3 micron, but is influenced by many factors such as oil viscosity, shaft surface finish and seal radial load. The first few hours of operation is called the "bedding-in" time. This is necessary not only for the meniscus to for, but also for the sealing edge to flatten. During this time limited leakage is possible. Adequate lubrication strongly reduces friction between sealing lip and shaft and also acts as a coolant to the generated heat. The lower the temperature can be kept, the longer will be the life expectancy of the seal. Should the fluid have poor lubricating capability (water and aqueous solution), dust lip-type (AS, BS or CS) rotary lip seals must be used. In such a case make sure to fill the space between the two lips with grease. The friction heat also depends on the peripheral speed on the shaft.

Friction not only can be detrimental to the lip material, but also can cause a power loss which could be quite significant if low power is transmitted.

* Temperature

The temperature on the sealing lip is the medium temperature increased by the temp. caused by friction heat. The higher the effective operating temperature is, the faster the ageing of the elastomer will be, thus affecting the performance of the sealing lip and the shaft. Frictional heat depends on peripheral speed, sealing lip preloading, shaft surface finish, lubrication, medium, etc.

* Pressure

In most application there is no or little differential pressure. Where the rotary shaft seal is exposed to pressure, however, the sealing lip is pressed against the shaft, thus increasing temperature. In some cases, the pressure can even cause overturning of the

sealing lip. Over 0.2 bar at higher peripheral speeds or over 0.5 bar at low peripheral speeds back up ring or special designed rotary shaft seals with stronger sealing lip and supporting metal insert must be used. For the latter we refer to our P-types (e.r. AS-P).

Nevertheless permissible over pressures with P-type shaft seals are limited.

On request we can supply shaft seal with special reinforced lip to withstand pressure over the indicated value. If back up rings are installed standard rotary shaft seals can be used. However, back up rings increase costs and often the necessary space for installation is not available. Sometimes the use of back up rings is even not possible, Since it requires a very accurate fitting as well as very low eccentricity of the shaft. Specially designed rotary shaft seals (P-types) re therefore preferred, even if more accurate fitting and lower eccentricity of the shaft than in normal cased is required.

Production and Quality Assurance

Our rotary shaft seals are manufactured according to German Standard DIN 3760 and Quality assurance standard ISO 9002. All production phases are checked and all measurements are recovered and stored for eventual tracing.

* Press fit allowance and permissible eccentricity in accordance with German Standard DIN 3760

The outer diameter should be measured at two locations, offset by 90 degrees, according to DIN 3761 part 6. The applicable value is the average value of the two measurements, provided that permissible eccentricity is not exceeded by either measurement.

* Final Inspection Standard

In accordance with our production standard and DIN 3761 part 4. The contact band width of the sealing lip is defined, according to DIN 3761 part 4,

Types for special Application

1) Radiaseal

Radial seal is a ritary shaft seal with fabric reinforced outer diameter, rubber sealing lip and fitted with stainless steel garter spring AISI 302 (DIN 1.4300). Radiaseal has been designed for use as bearing seal for roll neck application of metal rolling mills, paper mills, heavy duty gear-boxes and for marine applications.

Radiaseal has several advantages :

- Accurate machining of housing bore is not essential.

- Easy assembly.

- No corrosion problems.

- Easy replacement.

There are 4 different types of Radiaseal in both endless or split version.

- D5 standard

- D5S with additional dust lip

- D6 with ports in base usually twin fitted back to back, with anular groove in the housing allowing lubricant to pass around to the sealing lips.

- D7 with anular groove in addition to ports, allowing lubricant to pass around to the sealing lips. Usually twin fitted back to back.

Radiaseal is standard produced in NBR elastomer. Upon request it is also available Viton.

Fitting Instructions

- Shaft tolerance ISO h9.

Surface finish roughness Rt 4 micron

Hardness of the shaft surface 55 HRC or more.

- Housing bore tolerance ISO H8.

Surface finish roughness Rt 16 micron.

- Radiaseal is manufactured with oversized O.D and the housing must be provided

with retaining plate to give controlled axial compression to the seal, to correctly

located the seal in the housing, giving good sealing on the O.D.

d = nominal shaft diameter

D = nominal bore diameter

H = shaftseal height

L = nominal bore depth

Split Radiaseal should be installed with the split on the top and should not be used where static fluid level is highier than the lowest point of the seal. Where two Split Radiaseal are fitted together, the splits should be staggered at 30℃ on each side of the top. The bore entrance and the shaft should be provided with lead-in chamfer to facilitate

proper entrance of the seal into the cavity and to avoid lip damage. Length and angle of the chambers should be according to drawing and table now.

2) Splitring

Splitring is a rotary shaft seal without metal insert, split, fitted with stainless steel coil garter spring AISI 302 (DIN 1.4300). Splitring is used where a standard endless hard shaft seal cannot be fitted due to the presence of flanges or abutments. Splitring can be also used to avoid high strip down costs.

Splitring should be fitted with the split at the highest point of the shaft and should not be used where static fluid level is higher than the lowest point of the seal. Clean the housing recess and remove all burrs and sharp edges. Strength the coil garter spring around the shaft and join it by screwing the conical end into the open. Place the splitring around the shaft and stretch the spring into the groove on the sealing lip. Compress the Splitring slightly against the shaft by pressing its outside diameter and feed the seal into the housing bore starting near to the split and working around the entire periphery until the Splitring has been entered into the housing and then push the seal fully home. The housing must be provided with retaining plate to give axial compression to the seal.

3) DINA Seal

This is a specially designed rotary shaft seal to be used for needle bearing applications. DINA Seal is reinforced with steel insert and has a single thin lip without spring that, together with minimal interference, has low frictional loss. To fit better into the bore DINA Seal has rubber waved Outer Diameter, except small seals up tp 7 mm O.D which have ground metal O.D.

Standard DINA Seal materials are NBR elastomer and Carbon insert. For special applications also VITON and Silicone elastomers and or stainless insert are available upon request. DINA Seal can be used to prevent lubricant leakage if mounted with the front face near to the needle bearing, or to protect the bearing from dust and dirt entry if mounted with the back face near to it.

Storage and Handling

Some storage precautions must be taked in order to avoid deterioration of the material. Rotary shaft seals should be stored in a dust free and dry atmosphere and must be kept in their original wrapping which should only be opened just before installation. Samples should be repacked after inspection. Excessive humidity will deteriorate some elastomers as well as cause corrosive damage to metal casing and spring. Do not drop rotary shaft seals on shelves or boxes, nor hang seals on hooks, wires or nails, since in either case the sealing lip can be damaged. Seals should be stored in a horizontal position. Seals should be used on a first-in first-out basis to avoid ageing on the shelf. Avoid storage near sources of heat or near electrical equipment that may generate ozone. Also keep away from direct sun light.

2. V-RING (Frontseal)

V-ring is an all elastomer axial seal for shafts and bearings. It seals aaxially against a counterface. This type of seal has been used widely for several applications and has proved to be reliable and effective against dust, dirt, water and oil splash and other media. The ring consist of three parts :

a - The seal body, installed with interference to the shaft.

b - The hinge, acting as a sprung connection between the body and the lip.

c - The conical self adjusting lip which provides the actual dynamic sealing against the counterface.

The counterface can be the outside of the bearing cap, a washer or any suitable metal pressing.

Standard Seal Types

VA type : is the most common profile. It has a perpendicular rear face.

wide range of sizes, from 3 to 2020 mm shaft.

VS type : with wide body to ensure higher radial force than VA type.

Range of sizes from 5 to 210 mm shafts.

VL type : this seal is intended for applications where space available is limited.

Range of sizes from 135 to 630 mm shafts.

VE type : is our heavy duty large diameter seal, used in steel mills, paper mills

and rolling mills as a dirt/water excluder seal. A standard clamping

band can be used to improve axial fixation.

Elastomeric Sealing Materials

NBR, Nitrile rubber

This elastomer is a copolymer of butadience and acrylonitrile and is used for the majority of conventional fluid sealing applications.

- Working temperature range : -40℃ ~ +120℃ in oil / +90℃ in water

- Tensile strength : up to 15 MPa

- Standard colour : black

* Advantage :

- Good resistance to mineral oil and grease

- Good resistance to water and radiator fluid

- High tear strength

* Limitation :

- Poor resistance to high-alloyed hypoid oil

- Not resistance to polar fluids (glycol based)

- Poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichlorethylene)

- Poor resistance to aromatic solvents.

FPM, FKM, Fluorinated rubber

Mostly know under the trade name Viton from Du Pont, Technoglon from Montedison and Fluorel from 3M. It has good chemical resistance and is recommended for high temperature application.

- Working temperature range : -30℃ ~ +200℃

- Tensile strength : up to 15 MPa

- Standard colour : brown

* Advantages :

- Excellent resistance to mineral oil and above all high-alloyed hyppoid oils.

- Excellent acid resistance

- Good resistance to aromatic and chlorinated hydrocarbons

- Excellent resistance to ageing, ozone and weathering

* Limitations :

- Limited cold flexibility

- Poor resistance to polar fluids (ketones, ethers, esters).

CR, Chloroprene rubber

- Working temperature range : -40℃ ~ +80℃

- Tensile strength : up to 15 MPa

* Advantages :

- Excellent resistance to ageing, weathering and ozone

- Moderate resistance to mineral oils and greases

* Limitations :

- Tends to harden or stiffen at low temperatures.

- Not resistant to non-mineral automotive brake fluids.

Installation and operation

Fitting

Fitting of the V-ring is very simple. The ring must be slightly streched and pushed along the shaft. It can either be done manually or with a simple tool, in a way that the distance to the counterface can be maintained constant using little pressure.

Eccentricity / Misalignment

The V=shafe of V-ring provides an effective and reliable sealing even with oval section or eccentrically turning shafts. Sealing is not even affected by a slightly tilted counterface.

Counterface

The counterface finish is very important for an efficient sealing and for useful of the seal. The surface must be smooth, free of scratches and sharp peaks, finish Rt = 1 to 4 micron. Serveral materials can be used : soft metals, (light alloy, cast metal, etc.) only in well lubricated applications. For unlubricated applications the surface should be treated with a dry lubricant such as Molykote spray.

Peripheral speed

At peripheral speed up to 8 m/s the lip of the V-ring has a good pressure against the counterface and it has the function of a light contact seal. Over 8 m/s the seal must be supported axially and above 12 m/s radial retention is necessary, mounting the V-ring in an axial groove or applying an adequate support.

Production and Quality Assurance

Our V-ring is manufactured according to Quality Assurance Standard ISO 9002. All production phases are checked and all measurements are recorded and stored for eventual tracing. Our V-ring is individually inspected to ensure that sealing edge and sealing band are without faults. Also small cracks and shorts which could cause a split during mounting our functioning of the seal are not accepted.

Storage and Handling

Some storage precautions must be taken in order to avoid deterioration of the material. V-ring should be stored in a dust free and dry atmosphere and they must be kept in their original envelope which should only be opened just before installation. Samples should be repacked after inspection. Do not drop V-ring an shelves or boxes, nor hang seals on hooks, wires or nails, since in either case the seal can be damaged. Seals should be stored on a first-in first-out basis to avoid ageing on the shelf. Avoid storage near sources of heat or near electrical equipment that may generate ozone. Also keep away direct sunlight. Avoid unnecessarily compressing the lip during storage.

SPECIAL SEAL

1. Eriseal, Spring energized modified PTFE seal

The Eriseal, spring energized PTFE seal is the newest generation of spring actuated Teflon seals. These seals consist of a special precision jacket/lip made of Teflon or other high performance polymers, and a corrosion resistant stainless steel spring. In this combination, the spring is forcing the seal lips against the gland and the rod walls. The pressure assists the spring force. The spring compensates the lip wear, hardware tolerances, eccentricities and provides permanent resilience to the seal lips. The GFD design with sealing lip and spring arrangement guarantees more leakage protection than conventional lip seals. More than 50 different PTFE compounds (and other high performance polymers) are available or can be composed for jacket fabrication within a very short time. The standard designs cover radial and axial seals for dynamic as well as static applications. In addition to standard designs, we are also able to produce designs made to specification for special applications (silicone filled, sanitary seals, ultra low friction seals, etc.). A wide variety of materials, dimensions, and designs provide the opportunity to solve difficult sealing problems.

Application

Eriseals are employed where traditional seals with a rubber element can not be used owing to operating conditions involving chemicals, toxic substances or particularly high or low temperatures and consequently, they find wide application in the medical, chemical, petrochemical and food processing industries.

The wide variety of types provide the opportunity to meet all sealing requirements for axial and radial seals. Not all maximum stresses can be applied to the seal at one time.

The variety of designs, jacket and spring materials, together with several springs and dimensions allow sealing applications within the following working ranges:

- Temperatures from -250℃ ~ +316℃

- For rotation and reciprocating movement up to 5 m/s

- For static applications up to 3500 bar pressure

- For dynamic applications up to 550 bar pressure

- Universal chemical-resistant

- For vacuum and UHV applications

- Diameter from 2 mm up to 2000 mm

Advantages

- Ensure optimum sealing efficiency, even under chemically or thermally arduous operating conditions.

- Empolyed for dynamic applications are characterized by extremely low friction and absence of stick-slip.

- Excellent dry-running properties.

- Prevent contamination of media.

- Don't age during prolonged storage.

- Can be incorporated in standard O-ring grooves to AS568A or BS 1806, or employed to replace V-packing, gland packing, etc.

Type

Material

1) Seal jacket material

* PTFE-virgin (code no. 01)

: Recommended for low to moderate dynamic or static service. Low gas permeability.

FDA approved. Good cryogenic(low temperature) properties.

* PTFE-virgin modified (code no. 1X)

: Recommended for low to moderate dynamic or static service. Lowest gas permeability

FDA appproved. Higher creep resistance, very high chemical resistance.

* PTFE-reinforced with Carbon & Graphite (code no. 03)

: Very good universal properties for higher temperatures and resistance to wear.

Especially suitable for hot water and steam service as well as for poor lubrication.

* PTFE-fillled with Glass fiber with MoS₂ (code no. 06)

: Ertremely abrasion resistant, recommended for high pressure hydraulic. water and steam service. All high speeds and with soft metal surfaces may be abrasive wear possible.

* UHMW-PE modified (code no. 08)

: Excellent wear resistant, but limited chemical and heat resistance. Especially suitable

for abrasive media and water based liquids. FDA approved.

* PTFE-reinforced with special filler (code no. 10)

: Superior wear and heat resistance. may also be used for soft metals. No abrasive wear. Recommended for static and dynamic service, high temperatures and high speeds.

* PTFE-filled with graphite (code no. 12)

: Excellent general purpose material with low friction, good wear and heat resistance.

Non-abrasive. Good for water service, dry or poorly lubricated applications.

* PTFE-filled with Bronze (code no. 39)

: Very good compressive strength and hardness, good thermal conductivity, excellent resistance to tracking, very good abrasion resistance.

* Additional sealing materials in stock. We can compound seal jacket materials for optimal performance. This is why we are able to offer a wide variety of sealing materials. We can offer more than 50 different compounds. only the most frequency used compounds have been listed above.

2) Spring Energizer materials

* Standard spring material - 301 stainless steel(1.4310) (code no. C)

* Special spring material - Elgiloy (2.4711) (code no. E)

Inconel (2.4668) (code no. I) Hastelloy (2.4602) (code no. R)

* For other stainless steels, such as 316, 302, 17-7PH ask technical service.

Surface Finish, Rod & Housing

The life expectancy of the seal and the sealing quality is also directly dependent upon the quality of the sealing surface. We recommend the following surface finish.

The life expectancy of the seal and the sealing quality is also directly dependent upon the quality of the sealing surface.

Applications Sealing Medium

Gases, Cryogenics Fluids

Dynamic Ra = 0,2 ~ 0,3 μm(N3~N4) Ra = 0,2 ~ 0,4 μm (N3~N5)

Rt = 0,5 ~ 1,2 μm Rt = 0,8 ~ 1,6 μm

Static Ra = 0,3 ~ 0,8 μm(N4~N6) Ra = 0,4 ~ 1,6 μm (N5~N7)

Rt = 1,2 ~ 3,2 μm Rt = 1,6 ~ 6,3 μm

Other non-sealing surfaces approximately Ra = 0,4 ~ 6,3 μm (depending on dimension)

Installation

The installation in split grooves is the easiest way. Seals can usually be installed in partially closed grooves (with retainer) without any problems. Depending on diameters and cross sections, the type 103 seals can be installed in closed (non split design) grooves. In such cases, we recommend contacting our technical service. The mating surfaces should be smooth, free of burrs and sharp edges. Lead-in chambers should be available for shafts and cylinders. When assembling over grooves and threads, a sleeve should be used to protect the seal. Light oiling or greasing makes the assembly easier.

2. Lipseal

In the chemical and food processing industries, Lip seals are employed as pump and agitator shaft seals to provide positive sealing of liquids, powders and gases. The standard sizes corresponded to those of the oil rings in accordance with DIN3760. Of comparatively simple design the Lip seal successfully provides an effective seal at relatively high pressures, extreme temperatures, high pressures, high speeds, as well as with corrosive, abrasive and aggressive liquids, gases and powders.

Lipseal, the universal sealing system for shaft seals of all kinds. The basic element for an all-purpose shaft seal is lip seal. In daily use, with high temperatures, high peripheral speeds and corrosive media. A variety of standard materials assure a wide basis in gearboxes, ventilators, screw motion, wipers, chemical devices, pumps, agitators, mixers, mills, compressors, dryers, centrifuges and many more.

Operating range

* Pressure range

- up to 12 bar pressure (Lip combination : up to 30 bar)

- up to 0.1 mbar vacuum

* Temperature range : -180℃ ~ +280℃

* Circumferential speed up to : 30 m/s

The new generation of rotary shaft lip seals were especially developed for use under difficult and extreme conditions. The superior properties of PTFE as lip material combined with a corrosion resistant stainless steel housing provide the particular advantages of these rotary shaft lip seals.

Lowest friction and power draw, long seal life because of wear resistant lip materials, almost universal chemical resistance (depending on lip material), suitable for dry running and poorly lubricated conditions, exchangeable with standard lip seals according to DIN 3760, for food or pharmaceutical industry

Lip Materials

DL5000

Resistant to chemicals and solvents, temperature resistant, wear resistant, black.

DL6010

Special blend for mechanical, thermic and chemical use. light brown. Extremely wear resistant, Highly resistant within a wide temperature range, Permanent temperature resistant, High creeping strength, Caustic solutions.

DL6020

Teflon with filler, FDA approved, a material for the foodstuffs and pharmaceutical industries. white.

Bonded seal

Bonded seal are static sealing elements for bolt heads, lock nuts, cap nuts, rivets, screwed couplings and flanged connections. Bonded seal are composed of a metal outer ring and a trapezoidal synthetic rubber inner ring. These parts have been bonded by a vulcanizing procedure. The steel ring has been treated with a rust-preventing agent. Bonded seal can be used for working pressures up to about 650 atm. with a safety factor = 3, irrespective of pressures being against constant or pulsatory. They are suitable for sealing against oil, nitrogen, oxygen, hydrogen, water, mixtures of water and ethylene glycol, hydraulic fluids, silicone based lubrications, lubricating oils, petroleum products, gasoline, kerosine, alcohol, various gases ( for instance propane, methane and ethene) and a large variety of chemical subsidences. The temperature range is -40℃ ~ +110℃.

Sealing Principle

Bonded seals are installed between the parallel surfaces of parts to be bolted together. due to the bolt tightening procedure the trapezoidal rubber ring will be transformed into a sealing element with a hollow inside circumference facing the pressure. The radial pressure will force the edges of the hollow circumstance against the surfaces to be sealed. In case of vibrations Bonded seal will also protect threaded connections from loosening. Pulsating pressures will not affect the sealing performances.

Fitting instructions

The inside diameter of the ring must be 0.5 to 1mm larger than the outside diameter of the screw thread concerned. Bonded seal must under no circumstances sit close on the inside, as they might then be damaged by the thread. The sealing surfaces must be even and parallel. Thanks to the nature of the sealing ring the surfaces to be sealed need no be refinished. The bolt must be tightened until a metal-to-metal joint has been achieved between the ring and the sealing surfaces. Excessive tightening of the bolts is not necessary and even undesirable, as the performance of the Bonded seal would not be increased and subsequent unscrewing would be more difficult. If installed with care, Bonded seal can be re-used more than once. When used for sealing flanged pipe couplings, Bonded seal should preferably be placed in a recess to ensure proper location.