Machined Piston Seals

Profile

Name

Operating Range

Summary

The KB01 profile is an asymmetric single acting/uni-directional hydraulic piston u-cup seal. The seal has a shortened dynamic lip which offers improved low friction sealing and compression set characteristics in comparison to standard symmetrical u-rings.
The seal has an interference fit along the inside diameter to ensure a stable fit in the housing and to provide a tight static seal across the inside diameter.

The KB01 profile is available in several of M Seals high performance materials to provide the designer or repairer with exceptional extrusion resistance, low compression set and outstanding wear properties.

KB01A profile is an asymmetric single acting/uni-directional hydraulic piston working u-cup seal.

The seal has a shortened dynamic sealing lip and increased groove depth and groove width which offers increased seal deflection while providing improved friction and compression set characteristics in comparison to standard symmetrical u-rings.

It has an interference fit along the inside diameter to ensure a stable fit in the housing and to provide a tight static seal across the inside diameter of the seal groove.

This profile is available in several of our high-performance seal materials to provide both design engineers or repairers with exceptional extrusion resistance, low compression set and outstanding wear properties.

KB01B profile is an asymmetric single acting/uni-directional hydraulic piston u-cup seal.

The seal has sharp dynamic sealing lips which help provide positive fluid film removal from the cylinder bore. The outer sealing lip has also been reduced in length to provide improved friction and compression set characteristics in comparison to standard symmetrical u-rings.

It has an interference fit along the inside diameter to ensure a stable fit in the housing and to provide a tight static seal across the inside diameter of the seal groove.

This profile is available in several of our high-performance seal materials to provide both design engineers or repairers with exceptional extrusion resistance, low compression set and outstanding wear properties

The KB02 profile is an asymmetric single acting / uni-directional hydraulic piston u-cup seal complete with a pressure activated back-up ring to enable use up to 700 bar as standard and higher if required with the correct choice of back-up ring.

The seal has a shortened dynamic lip which provides improved low friction sealing and compression set characteristics in comparison to standard symmetrical u-rings and has an interference fit to ensure a stable fit in the housing and to provide a tight leak free static seal across the inside diameter.

This seal is available in several of M Seals high performance materials to provide the designer or repairer with exceptional extrusion resistance, low compression set and outstanding wear properties.

The KB02A profile is an asymmetric single acting / uni-directional hydraulic piston working u-cup seal which is designed for applications where groove space is limited and comes complete with a triangular pressure activated back-up ring to enable use up to 700 bar as standard and higher if required with the correct choice of back-up ring.

The KB02A has an interference fit along the inside diameter to ensure a stable fit in the housing and to provide a tight leak free static seal across the inside diameter and is available in several of M Seals high performance materials to provide the designer or repairer with exceptional extrusion resistance, low compression set and outstanding wear properties.

The KB02B profile is an asymmetric single acting / uni-directional hydraulic piston working u-cup seal which is designed to help reduce the frictional footprint of the seal in dynamic applications via the inclusion of a secondary PTFE sealing element within the back heel of the main seal body.

Like other asymmetric seals the KB02B has an interference fit along its inside diameter to ensure a stable fit in the housing and to provide a tight leak free static seal across the inside diameter. The inclusion of the secondary PTFE sealing ring not only provides another sealing edge, but it also acts as a lubrication reservoir helping to reduce friction and help reduce the chance of stick-slip.

The KB03 profile is an asymmetric single acting / uni-directional hydraulic piston working u-cup seal complete with an O-Ring energiser which is recommended for low pressure or soft start systems. The O-Ring provides further sealing force across the sealing lips to ensure tight leak free performance even at low or zero pressure. The seal has a shortened dynamic lip for improved low friction sealing and compression set characteristics in comparison to standard symmetrical u-rings and has an interference fit along the inside diameter to ensure a stable fit in the housing and to provide a tight leak free static seal.

This seal is available in several of M Seals high performance materials to provide the designer or repairer with exceptional extrusion resistance, low compression set and outstanding wear properties.

Our KB03A profile is an asymmetric single acting / uni-directional hydraulic piston u-cup seal complete with both an O-Ring energizer and multiple sealing lips. The O-Ring energiser helps sealing at low pressures, while the multiple sealing lips provide some sealing redundancy and lubrication reservoirs to help reduce friction in dynamic applications.

This seal has been used with great success as a replacement for static O-Rings that may see occasional dynamic movement and can be manufactured to suit most internationally recognised O-Ring groove sizes.

It is available in several of M Seals high performance materials to provide increased extrusion resistance, low compression set and outstanding wear prorerties.

The KB04 profile is a modification of both the KB02 and KB03 profiles. The inclusion of the pressure activated back-up ring offers extrusion resistance and ensures safe use at higher pressures.

The use of the KB04 profile also allows the design engineer to use larger radial clearances where metal to metal contact must be avoided in applications that may have potential side-load/misalignment issues.

The O-Ring energizer offers increased sealing ability in low pressure or soft start systems where standard rod seals would allow low pressure fluid bypass.

The KB05 Profile is used in pneumatic sealing systems where low friction and high sealing performance are critical. The low footprint, radiused sealing lip gathers fluid film and the undercut on the outside diameter locks in initial lubrication. These features are unique in pneumatic rod seal design and help to considerably lower frictional values.

The seal is manufactured with an interference fit along the inside diameter which provides it with excellent stability in the groove while it reciprocates against the cylinder bore.

The KB05 profile is available in a variety of our high-performance materials, but our lubricated polyurethane s are most common due to the extra lubrication and abrasion resistance provided.

The KB05A Profile is for use in pneumatic sealing systems where sealing performance is chosen over frictional output.
The radiused sealing lip gathers fluid film to help lower frictional values while the piston is reciprocating at high speed.

The seal is manufactured with an interference fit across the inside diameter which provides the KB05A with stability in the groove helping to prevent any possible seal roll while under pressure.

The KB05A profile is commonly used in our standard Nitrile rubber material, but others are available if the application requires.

Profile KB08 seal is a compact double acting / bi-directional composite piston Seal which consists of a main PTFE or Hard PU sealing element and elastomer O-Ring energiser.

The O-Ring energises the sealing element and provides an effective leak free barrier around the inside diameter of the seal groove under static conditions.

The KB08 can be used in conjunction with our KB08B profile to provide a complete leak free sealing configuration or where sealing redundancy is required.

By using the combination of a PTFE sealing element and an elastomer O-Ring this product can be made suitable for a wide range of situations including low friction, high temperature or where aggressive chemical media is the main system fluid.

The KB08A profile is a heavy-duty piston composite seals which is a modification of our standard KB08 profile. Originally designed for un-standard housing sizes for the hydraulic cylinder repair market but also commonly used in large diameter heavy duty applications where extra sealing force or increased stability in the groove is required.

The seals energiser is an elastomer profile which prevents seal roll in the groove and provides the seal with added stability in comparison to standard O-Ring energisers.

This double acting piston seal is available in many combinations of our high-performance materials to provide the design engineer or repairer with the optimum solution for their sealing application.

Profile KB08B is a compact single acting / uni-directional composite Piston Seal which consists of a main PTFE or Hard PU sealing element and elastomeric O-Ring energiser.

The O-Ring energises the sealing element and provides an effective leak free barrier around the inside diameter of the seal groove under static conditions.

The special design of the KB08B profile allows trapped fluid pressure to be released back into the system when the piston is on its return stroke. Because of this feature this seal can be used in multiple or in conjunction with our KB08 profile to provide a complete leak free sealing configuration or where sealing redundancy is required.

By using a combination of a PTFE sealing element and the correct choice of elastomeric O-Ring energizer this product can be made suitable for a wide range of situations including low friction, high temperature or where aggressive chemical media is the main system fluid.

Our KB08C profile is a heavy-duty modification of the standard KB08B piston composite seal profile. Originally designed for non-standard housing sizes for the repair market but now commonly used in large diameter heavy duty applications where extra sealing force or increased stability in the groove is required.

The energizer is an elastomer profile which prevents roll in the groove and provides the seal with added stability in comparison to standard O-Rings.

This seal is available in many combinations of our high-performance materials to provide the design engineer or repairer with the optimum solution for their sealing application.

Profile KB08D seal is a compact double acting / bi-directional composite piston seal which consists of a Hard PU sealing element and elastomer O-Ring energiser.

The O-Ring energises the sealing element and provides an effective leak free barrier around the inside diameter of the seal groove under static conditions and the hard PU sealing element provides a highly abrasion resistant positive seal against the cylinder bore counter face.

The KB08 can be used in conjunction with our KB08B profile to provide a complete leak free sealing configuration or where sealing redundancy is required.

Profile KB08E is a modification of our standard KB08 profile. The side walls of the seal are tapered away from the groove walls and the clearance gap between the mating hardware. This feature helps the seal withstand higher pressures than the normal design or allows the design engineer freedom to increase the clearance gap between the metalwork helping to prevent possible metal-to-metal contact and subsequent damage.

The seal is a compact double acting /bi-directional piston composite seal which consists of either a main PTFE or Hard PU sealing element and an elastomeric O-Ring energiser.

The O-Ring energises the sealing element and provides an effective leak free barrier around the outside diameter of the seal groove.

By using the combination of a PTFE sealing element and the correct elastomer O-Ring this product can be made suitable for a wide range of situations including low friction, high temperature or where aggressive chemical media is the main system fluid.

Designed for use on one-piece solid pistons the KB09 is a 4-piece double acting/bi-directional piston seal comprising of a central polyurethane sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.

The precision machined guide/wear rings allow higher working pressures and larger clearance gaps between the hardware components.

The central sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions

KB09 is commonly used when repairing hydraulic cylinders that have had the bore honed to a non-standard size.

Designed for use on one-piece solid pistons the KB09A is a 4-piece double acting/bi-directional piston seal comprising of a central filled PTFE sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.

The precision machined guide/wear rings allow higher working pressures and larger clearance gaps between the hardware components.

The central sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions

The KB09A can be offered in several material combinations for use in high temperatures and/or to provide enhanced chemical resistance

Designed for use on one-piece solid pistons the KB09B is a high-pressure modification of our standard KB09 profile.
Like its sister product It is a 4-piece double acting/bi-directional piston seal comprising of a central polyurethane sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.

The precision machined guide/wear rings allow higher working pressures and larger clearance gaps between the hardware components and wrap around the sidewalls of the seal for protection.

The central sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions

Designed for use on one-piece solid pistons the KB09C is a more standard 5-piece piston seal profile.

It is a double acting/bi-directional piston seal comprising of a central elastomeric sealing element, precision machined thermoplastic guide rings and back-up rings which are split to allow assembly onto the solid piston.

The central sealing element provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions

Designed for use on one-piece solid pistons the KB09D is a modification of our KB09C profile, commonly used in hydraulic cylinders found in off-highway applications.

It is a double acting/bi-directional piston seal comprising of a central elastomeric sealing element and precision machined thermoplastic back-up rings which are split to allow assembly onto the solid piston.

The central sealing element provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness.

Designed for use on one-piece solid pistons the KB09E is a 6-piece double acting/bi-directional heavy-duty piston seal.

The seal is commonly used in large diameter, long-stroke applications that have high bearing loads and require larger clearance gaps between the hardware components to prevent metal-to-metal contact.

The central sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions

The KB09A can be offered in several material combinations for use in high temperatures and/or to provide enhanced chemical resistance.

The KB112 chevron packing set is an old and trusted sealing solution for piston applications.

The special design of this set provides automatic pre-load which means the engineer doesn’t have to make manual adjustments to the seal gland which is common when using rubber & fabric packing sets.

The intermediate V-ring/s are stacked on top of each other to provide redundant sealing capability which is useful when the primary seal fails. The choice of too many V-rings though can see the packing set ‘burnout’ through increased friction; we recommend 1 ring for piston applications and a maximum of 2. If more rings are necessary then our KB112B profile should be utilised in one of our high performance internally lubricated Polyurethanes.

The female header ring is normally manufactured from a common engineering plastic or hard grade Polyurethane to provide extrusion resistance and to provide stability in the gland. The force of the system pressure into the primary male pressure ring increases sealing force by ensuring that the V-rings are energised and further activated under pressure.

Common materials are PU and POM, but a variety of materials can be provided to suit most applications – Please talk to our technical department if you need assistance with your applicati

The KB112B chevron packing set has been specifically modified to improve the frictional footprint of the intermediate sealing V’s. A simple lubrication reservoir has been added into the side wall of the sealing element to aid lubrication in long stroke or high-frequency applications.

The design of this set provides automatic pre-load which means the engineer doesn’t have to make manual adjustments to the seal gland or crush the seal which is common when using older rubber & fabric packing sets.

The intermediate V-rings can be stacked on top of each other to provide redundant sealing capability which is useful when the primary seal fails. We recommend a maximum of 2 sealing rings, but up to 4 can be used with this profile, but we suggest that the seal be manufactured in one of our high performance internally lubricated Polyurethanes to help prevent stick-slip caused.

The female header ring is normally manufactured from a common engineering plastic or hard grade Polyurethane to provide extrusion resistance and to provide stability in the gland. The force of the system pressure into the primary male pressure ring increases sealing force by ensuring that the V-rings are energised and further activated under pressure.

Common materials are PU and POM, but several different materials can be provided to suit most applications – Please talk to our technical department if you need assistance with your application.

The KB112E chevron packing set has been modified with radiused intermediate chevron rings to improve high-pressure sealing.

The design of this set provides automatic pre-load which means the engineer doesn’t have to make manual adjustments to the seal gland or crush the seal which is common when using older rubber & fabric packing sets.

The intermediate V-ring/s can be stacked on top of each other to provide redundant sealing capability which is useful when the primary seal fails. The choice of too many V-rings though can see the packing set ‘burnout’ through increased friction; we recommend 1 ring only for piston applications and a maximum of 2.

Common materials are PU and POM, but several different materials can be provided to suit most applications – Please talk to our technical department if you need assistance with your application.

Profile KB11E is the intermediate high-pressure chevron packing ring from our KB112E profile and is commonly used in high-pressure applications such as pressure washers. It can be used individually in certain circumstances where the profiled female support ring may already be profiled as part of the metallic hardware. This is sometimes appropriate in fluid sealing systems such as large presses used in steel plants and pressure washing systems.

To offer the KB11E individually we must have confirmation of the mating hardware dimensions, specifically the radius where the non-pressure side of the seal will be seated.

The KB14 seal is a special spring energised seals primarily intended for dynamic applications where reciprocating or moderate rotating movement is present. The P14 is used in applications where a standard cross section of seal cannot be used or where the seal requires an in-built stand-off ring to avoid crushing under potential back-pressure build up.

It can be used in applications where large gland tolerances exist or where there is a need for higher deflection due to expansion caused by high pressure duty. The seal is commonly used in foundries in place of standard rubber and fabric chevron seals where fluid compatibility is an issue or where extreme high temperature is present.

The seal consists of a U-shaped jacket and 2 cantilever springs which are available in 301 Stainless steel, Hastelloy® C-276 and Elgiloy® as standard. The cantilever spring design offers a moderate load versus deflection which is suitable for most applications. The design of the cantilever spring places the spring load at the front of the sealing lip making the KB14 seal an excellent option should a scraper lip be required for abrasive media sealing or scraping

Commonly referred to as a Cup seal or Dish ring our KB16 design is a single acting/uni-directional seal with a positive, flared lip design to provide good dynamic sealing force.

The Cup seal is traditionally used in older hydraulic or pneumatic equipment and seals from one direction only, it is generally returned to position by a spring situated on the none-pressure side.

The P16 is useful in friction critical applications due to its flexible low contact sealing lip.

The P16 is available in several of our high-performance materials to cover a multitude of applications

Commonly referred to as a Cup seal or Dish ring our KB16A design is a single acting/uni-directional seal with a positive, flared lip design to provide good dynamic sealing force.

The Cup seal is traditionally seals from one direction only, it is generally returned to position by a spring situated on the none-pressure side.

The KB16A is useful in friction critical applications due to its flexible low contact sealing lip and radiused back heel which helps preserve a fluid film on the cylinder bore.

Designed for use on split/2-piece pistons, the KB17 is a double acting/bi-directional piston seal comprising of a central sealing element and precision machined thermoplastic guide rings.
These rings allow higher working pressures and larger clearance gaps between the hardware components.

The central sealing element provides initial radial compression upon installation to provide low pressure sealing and when subjected to system pressure the seal energises to provide further compressive force and leak tightness. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions

KB17 is commonly used in British agricultural machinery and hydraulic cylinders found in the steel industry.

This seal is available in almost all of our materials and can be optimized to suit particular applications.

The KB19 seal is primarily intended for dynamic applications where reciprocating movement is present but can also be used in static applications where large gland tolerances exist or where there is a need for higher deflection due to expansion caused by high pressure duty. The seal consists of a U-shaped jacket and a cantilever spring both of which can be tailored to suit both high-temperature and conditions where good chemical compatibility is required.

The design of the cantilever spring places the spring load at the front of the sealing lip making the CSE series an excellent option should a scraper lip be required for abrasive media sealing.

It is designed for non-standard groove sizes in repair situations

KB20 is a compact double acting piston seal designed for both low and high-pressure heavy-duty applications. The seal comprises a T-shaped sealing element with pressure activated non-extrusion rings.

The seal is manufactured with an interference fit on the inside diameter to help prevent seal roll and spiral failure. The seal also has two active anti-extrusion rings to ensure the sealing element is protected from extrusion when hardware clearances are large or pressures are high. The active anti-extrusion rings can be manufactured from several durable materials allowing a superior resistance to extrusion.

The KB20 seal is designed for use across a range of industrial and mobile equipment. It is particularly suited for use in cylinders, accumulators, actuators, valves and other demanding fluid power applications.

The KB20 can be manufactured to suit most internationally recognised O-Ring grooves in both metric and imperial sizes.

KB20-AES profile is a double acting (Bi-Directional) Springseal that was primarily designed for static applications in the Oil and Gas industry and is commonly referred to as the S-Seal.

The seal is comprised of an elastomeric sealing element complete with unique over-moulded metallic anti-extrusion springs to help it withstand high pressures and large extrusion/clearance gaps between hardware surfaces. It is manufactured with an interference fit on the inside diameter to provide good static sealing and to help prevent seal roll and spiral failure. It is an excellent choice for static and/or stab-in applications where separate back-up/anti-extrusion rings may get sheared or cause galling of mating metallic components.

The KB20-AES seal can be used across a wide range of industrial applications, but it is particularly suited for use in oilfield equipment such as well-heads, downhole tools, high pressure pipelines, riser systems, and end-cap seals within piston accumulators

KB20-ILS profile is a double acting (Bi-Directional) seal commonly referred to as the Interlocking T-Seal and was primarily designed for wellhead applications and downhole tools used within the Oil and Gas industry.

The seal is comprised of an elastomeric sealing element complete with unique locked-in thermoplastic anti-extrusion rings to help it withstand high pressures and large extrusion/clearance gaps between hardware surfaces. It is manufactured with an interference fit on the inside diameter to provide good static sealing and to help prevent seal roll and spiral failure under reciprocating conditions and is the perfect choice for static and/or stab-in (engage/disengage) applications where separate back-up/anti-extrusion rings may normally become sheared or cause galling of mating metallic components at installation point.

The KB20-ILS seal can be used across a range of industrial applications, but it is particularly suited for use in oilfield equipment such as well heads, downhole tools, high pressure pipelines, riser systems, and end-cap seals within piston accumulators

Profile KB20-LF is similar to our standard KB20 profile but has been modified for use in applications requiring a lower frictional footprint while still providing a positive sealing action.

Due to the modified compression on the KB20-LF, it is best suited to dynamic applications operating in both low and high-pressure applications. Like its sister seal the KB20-LF has the ability to operate at both high and low temperatures and in a multitude of different media through the correct choice of material combination.

We recommend choosing the standard KB20 profile where possible for a more positive sealing effect.

The KB20A is a single acting / uni-directional seal used for both static and dynamic applications and is designed to be installed into common international sized O-Ring grooves.

Profile KB20A excels in both low and high-pressure applications while also having the ability to operate at both high and low temperatures and in a multitude of different media through the correct choice of material combination.

It provides superior resistance to extrusion through its specially designed active Back-Up rings. Under system pressure the seal flange lifts the Back-Up Rings to block the clearance gap, protecting the sealing bulb at all times.

Profile KB20A-LF is similar to our standard KB20A profile but has been modified for use in dynamic applications requiring a lower frictional footprint while still providing a positive sealing action.

Due to the modified compression on the KB20A-LF, it is best suited to dynamic applications operating in both low and high-pressure applications. Like its sister seal the KB20A it has the ability to operate at both high and low temperatures and in a multitude of different media through the correct choice of material combination.

We recommend choosing the standard KB20A profile in single acting applications for a more positive sealing effect.

KB20W is a low-friction piston seal which provides a reduced frictional footprint under operation thanks to its small contact sealing bulb. The sealing face is supported by two tapered back-up rings which help prevent seal extrusion damage, rolling and spiral failure while under system pressure.

The low contact footprint of the sealing element provides good leakage control while offering a seal that is capable of increased operating speeds when compared to our standard KB20 profile. Like its sister seal the KB20W has the ability to operate at both high and low temperatures and in a multitude of different media through the correct choice of material combination.

The KB21 profile is a symmetrical sharp-lipped O-Ring energised U-Cup seal and is commonly used in the hydraulic repair market as it can function in both rod and piston applications.

The O-Ring energiser in this seal provides further sealing force across the sealing lips to ensure leak free performance even at low or zero pressure.

This profile can be provided in any of our high-performance materials, talk to our technical department about the best choice for your application.

The KB21Q is a modification of our standard KB21 profile and has been designed to help provide a more positive sealing effect directly to the main seal lips.

The X-Ring energiser used in this seal is less susceptible to being blown out from the energiser cavity as can sometimes happen when pressure bypasses and becomes lodged behind the more common O-Ring energiser .

Talk to our technical department about the best choice of materials for your application.

KB22 is a pressure activated packing set that comprises of a main U-ring sealing element and a male pressure/support ring.

The main U-Ring sealing element is designed to provide initial sealing force across the sealing faces upon installation. Sealing force is increased under system pressure through the pressure/support ring being forced into the U-shaped cavity, this spreads the sealing lips further to add increased seal contact force.

Although the KB22 is an old design of seal and the use of a more advanced sealing solution is recommended, it is still favoured by users of older hydraulic equipment commonly used in the steel industry

KB22A is a packing set that comprises of a main U-ring sealing element and a male pressure/support ring.

The main U-Ring sealing element is designed to provide initial sealing force across the sealing faces upon installation. Sealing force is increased under system pressure through the pressure/support ring being forced into the U-shaped cavity, this spreads the sealing lips further to add increased seal contact force.

The KB22A can also be used in an adjustable gland/housing and compressing the seal slightly in its groove. Over compression of the seal however will result in increased seal wear which in-turn decreases seal life. If the user wishes to utilise the compression method, we suggest using one of our lubricated polyurethane materials to help reduce frictional generated heat damage to the seal.

Designed for use on one-piece solid pistons and commonly used in mobile hydraulics in machinery such as excavators, the KB23 is a 4-piece double acting/bi-directional piston seal comprising of a central polyurethane sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.

The precision machined back-up rings allow higher working pressures and larger clearance gaps between the hardware components.

The central polyurethane sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness.

The KB23 requires guide/wear rings to be placed either side of the seal to keep the piston centralised in the cylinder bore while reciprocating under system pressure

Designed for use on one-piece solid pistons and commonly used in mobile hydraulics in machinery such as excavators, the KB23A is a 4-piece double acting/bi-directional piston seal comprising of a central filled PTFE sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.

The precision machined back-up rings allow higher working pressures and larger clearance gaps between the hardware components.

The central filled PTFE sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness.

The KB23A requires guide/wear rings to be placed either side of the seal to keep the piston centralised in the cylinder bore while reciprocating under system pressure.

Designed for use on one-piece solid pistons the KB23B is a high-pressure modification of our standard KB23 profile.
Like its sister product It is a 4-piece double acting/bi-directional piston seal comprising of a central polyurethane sealing element, elastomeric energising ring and precision machined thermoplastic back-up rings which are split to allow assembly onto the solid piston.

The precision machined back-up rings allow higher working pressures and larger clearance gaps between the hardware components and wrap around the sidewalls of the seal for protection.

The central sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness.

KB25 profile is a heavy-duty spring energised seal commonly used in heavy industry such as steel plants as a good replacement for rubber fabric seals that fail due to compatibility issues. The seal requires a 2-piece housing for installation purposes and correct function.

The helical spring energiser within the seal provides the initial pre-load for static sealing while the system pressure enhances the sealing function by further energising the sealing lips. The seal is used in areas where high temperatures can be seen and/or where a seal is required that has broad fluid / media compatibility.

The seal has a useful operating speed and can be manufactured from non-abrasive PTFE materials to protect hardware components from wear and abrasion.

Our KB26 profile is a double acting/bi-directional seal and a good choice when a compact seal which can be utilised in both static and slow-moving applications is required.

It is commonly used as a direct replacement for O-Rings In both static and dynamic applications due to its ability to resist rolling and twisting in the groove under dynamic movement.

The seal is easy to install into closed grooves and with its high-pressure capability it is a very popular and economical head seal replacement where a combination of O-Rings and Back-Up rings would normally be used together.

The KB26 offers superior pressure, wear and extrusion resistance in comparison to standard O-Rings when one of our high-performance polyurethane materials is specified.

The KB27 design is a double acting/bi-directional seal that combines the attributes of our standard KB16 profile but in both directions.

The KB27 should be simply attached by retaining plates and locking nut

Profile KB28 is a single acting /uni-directional U-Cup seal.

Its symmetrical lip design offers the choice of both piston or rod use and the positive shaped lip provides excellent fluid film removal from the mating metal component while providing minimal friction resistance.

Commonly used on both pneumatic and hydraulic actuators it is a good choice for applications where both positive sealing and low friction are required.

KB28 is commonly specified in one of our lubricated PU materials although it is available in many of our high-performance materials and is available for rapid delivery.

KB29 is a single piece double-acting / bi-directional sealing body that is normally utilised for piston sealing applications but can also be used for sealing rods on its inside diameter.

It can also be combined with bearing / guide rings to provide a full piston or rod seal assembly for use in environments that require a compact sealing solution.

The use of a 2-piece / split piston is suggested for easier installation.

KB29A is a modification of the standard KB29 profile. The sealing contact points have radiused edges to provide a lower frictional footprint and allow easier installation into mating hardware.

A single piece double-acting / bi-directional sealing body that is normally utilised for piston sealing applications but can also be used for sealing rods on its inside diameter.

It can also be combined with bearing / guide rings to provide a full piston or rod seal assembly for use in environments that require a compact sealing solution.

The use of a 2-piece / split piston is suggested for easier installation.

The XB51 profile is an asymmetric single acting / uni-directional hydraulic piston working u-cup seal complete with a combined pressure activated guide / back-up ring to enable use up to 700 bar as standard and higher if required with the correct choice of ring material.

The seal has a shortened dynamic lip which provides improved low friction sealing and compression set characteristics in comparison to standard symmetrical u-rings and has an interference fit to ensure a stable fit in the housing and to provide a tight leak free static seal across the inside diameter.

This seal is available in several of M Seals’s high performance materials to provide the designer or repairer with exceptional extrusion resistance, low compression set and outstanding wear properties.

XB60 is a double acting / bi-directional compact hydraulic piston seal produced in a choice of our high-performance polyurethane materials. The seal incorporates an elastomeric O-Ring energiser to provide pre-load for initial sealing at low and start-up pressures.

The unique design helps protects the O-Ring from possible damage caused at the installation stage and the polyurethane sealing element provides a positive sealing effect across the inside diameter contact point.

XB62 is a double acting / bi-directional piston seal designed for hydraulic and pneumatic dynamic applications and to be installed and operate in standard AS4716 O-Ring and Back-up Ring groove sizes.

The seal provides good low-friction dry running properties and reduces stick-slip in operation while being a compact design, which make it ideal for pneumatic applications.

The XB63 can be supplied in one of our high-performance PTFE materials complete with O-Ring energiser to operate in aggressive high temperature applications.

Profile XB64 is a compact double acting / bi-directional composite piston seal used for media separation.

It consists of a low-friction PTFE sealing element an elastomeric O-Ring energiser and a low-friction elastomeric media separator seal located in the PTFE sealing cap.

The media separator allows the separation of two types of media, a fluid on one side and a gas on the other – situations normally encountered in piston accumulators.

Profile XB64 is a compact double acting / bi-directional composite piston seal used for media separation.

It consists of a low-friction PTFE sealing element, two elastomeric O-Ring energisers and a low-friction elastomeric media separator seal located in the PTFE sealing cap. The media separator allows the separation of two types of media, a fluid on one side and a gas on the other – situations normally encountered in piston accumulators.

The use of two energising O-Rings optimises the sealing contact points and helps to reduce gas permeation through the inside of the groove and O-Ring. Using the combination of a PTFE sealing element and the correct choice of elastomer parts, this product can be made suitable for a wide range of situations including low friction, high temperature or where aggressive chemical media is the main system fluid

The XB65 profile is a modification of our standard XB64 profile. Originally designed for non-standard housing sizes for the hydraulic accumulator repair market but also commonly used in large diameter heavy duty applications where extra sealing force or increased stability in the groove may be required.

The seals energiser is an elastomer profile which prevents seal roll in the groove and provides the seal with added stability and the media separator allows the separation of two types of media, a fluid on one side and a gas on the other – situations normally encountered in piston accumulators.

This double acting piston seal is available in many combinations of our high-performance materials to provide the design engineer or repairer with the optimum solution for their sealing application.

Profile XB66 is a heavy duty compact double acting / bi-directional composite piston seal which consists of a main Hard PU sealing element and an elastomeric square section energiser. It operates as per our standard KB08D seal but has a rectangular energiser for use when the groove has become non-standard after repair.

The energiser provides positive compression onto the sealing element and provides an effective leak free barrier around the inside diameter of the seal groove.

The XB73 profile is a double-acting / bi-directional modification of our standard KB02B piston working u-cup seal which is designed to help reduce the frictional footprint of the seal in dynamic applications via the inclusion of a secondary PTFE sealing element within the back heel of the main seal body.

Like other asymmetric seals the XB73 has an interference fit along its inside diameter to ensure a stable fit in the housing and to provide a tight leak free static seal across the inside diameter. The inclusion of the secondary PTFE sealing ring not only provides another sealing edge, but it also acts as a lubrication reservoir helping to reduce friction and help reduce the chance of stick-slip while in operation.