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The design includes an integrated rubber quad ring seal in the outer filled-PTFE cap to ensure positive sealing and drift-free operation in medium- to heavy-duty service application. Designed to separate and seal two different media, e.g. fluid/gas. Commonly used in piston accumulators, mobile hydraulics and where low-friction, high-pressure drift-free sealing performance is required. Retro fits seals of similar design.

– Non-symmetrical piston seals are more stable and provide better sealing performance than symmetrical seals like U-cups or polypak type seals do.

Cap seal providing low friction and long service life over a wide range of light- to medium-duty bi-directional service applications. The K8E retrofits into standard O-ring grooves designed for no back-up, single, or two back-up rings without modification. The specially designed filled-PTFE cap resists extrusion and twisting of the O-ring under higher pressure.

O-ring-energized low-friction uni-directional filled-PTFE piston cap seal provides smooth movement, low-friction sealing for low- to medium-duty service applications. Retro fits seals of similar design.

The basic design of a piston seal significantly affects the overall function of the seal, especially at low pressures. One of the most challenging applications is linear dynamic sealing at low pressure while providing low breakaway and running friction. AHPSeals provides a series of low-friction piston seals for these challenging applications.

Heavy-duty squeeze-type no-drift piston seal, L-shaped heavy-duty load bearing active back-up rings handle larger clearances, elevated temperatures, misalignment and high pressures. Rubber energizer allows for fitting on a one-piece piston design.

Squeeze-type piston seal with integrated L-shaped wear rings for use on vertical or no-drift piston. Energizer allows fit on one-piece pistons. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost.

Wiper seal

Low-Friction Bi-Directional Hydraulic Piston Seal Cap seal providing low friction and long service life over a wide range of light- to medium-duty bi-directional service applications. The K8E retrofits into standard O-ring grooves designed for no back-up, single, or two back-up rings without modification. The specially designed filled-PTFE cap resists extrusion and twisting of the O-ring under higher pressure.

Heavy-duty squeeze-type piston seal for use on vertical or no-drift piston. L-shaped heavy-duty back-up rings handle larger clearances, misalignment and high pressures and are also easier to assemble. Maximum pressure rating 10,000psi dynamic and 20,000psi static. Requires split piston design for smaller diameters for easier fitment.

– Extrusion gaps, clearances: The extrusion gap is defined as the maximum radial clearance on one side between the seal housing opposite of pressure and the sealing surface. The extrusion gap is the most pressure-limiting factor to any seal. Larger extrusion gaps will always reduce a seal’s pressure capability.

Low-Friction High-Pressure Bi-Directional Hydraulic Piston Seal Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation of hydraulic cylinders over a wide range of medium- to high-pressure sealing applications. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Medium-Duty Bi-Directional Piston Seal with Live Wear Rings Squeeze-type piston seal for use on vertical or no-drift piston. Rubber energizer allows for easier fit on a one-piece piston. Live wear rings handle greater side load and extrusion gaps. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost. Ideally suited to cylinders constantly operating at a vertical angle.

Materials: high-performance polyurethanes, PTFE, PTFE, engineered thermoplastics, NBR, Nitrile, FKM, Viton®, H-NBR, EPDM, FDA-compliant food grades, low- and high-temperature grades, including proprietary Duralast™, Duraloy™, and Permachem™ compounds.

Materials: PTFE, PTFE, high-performance polyurethanes, engineered thermoplastics, NBR, Nitrile, FKM, Viton®, H-NBR, EPDM, FDA-compliant food grades, low- and high-temperature grades, including proprietary Duralast™, Duraloy™, and Permachem™ compounds.

Heavy-Duty Bi-Directional Piston Seal with Live Back-Up Rings Squeeze-type piston seal for use on vertical or no-drift piston. Positive actuated live back-up rings to eliminate seal extrusion in high-pressure applications or larger extrusion gaps. Requires split piston design for smaller diameters for easier fitment.

Premium Long-Life Low-Friction Hydraulic Piston Seal Non-symmetrical uni-directional design provides longest service life in medium – to high – pressure hydraulic piston sealing applications. Beveled lip for maximum fluid sealing ability and a stretch fit ensures stability and a tight static seal on the piston. ISO 5597 and many other sizes available.

Non-symmetrical piston seal designed to eliminate seal extrusion in high-pressure systems. The integrated positive actuated live rectangular back-up ring eliminates extrusion, yet allows this seal to be fitted when fitment and assembly are more difficult.

Squeeze-type piston seal for use on vertical or no-drift piston. Positive actuated live back-up rings to eliminate seal extrusion in high-pressure applications or larger extrusion gaps. Rubber energizer allows for an easier fit on one-piece pistons.

High-Pressure Bi-Directional Hydraulic Piston Seal O-ring-energized cap seal design. The specially designed hard wearing, 60 shore D, self-lubricated polyurethane cap is much easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes up to 10,000psi. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

– Temperature: Higher operating temperatures will soften the seal and back-up ring material reducing its pressure capability. This affects most traditional seal materials when operating above 70% of their specified maximum operating temperature. Some of our high-performance sealing materials are designed to operate at 90% of their specified temperature without significant loss in hardness. Conversely, lower operating temperatures can increase the extrusion resistance of seal materials.

Premium Low-Friction High-Pressure Bi-Directional Hydraulic Piston Seal Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation for hydraulic cylinders over a wide range of high-pressure sealing applications. Back-up rings handle larger clearances, elevated temperatures, misalignment, high pressures and ultra-high pressure spikes. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

Low-Friction Hydraulic Piston Seal O-ring-energized low-friction uni-directional filled-PTFE piston cap seal provides smooth movement, low-friction sealing for low- to medium-duty service applications. Retro fits seals of similar design.

O-ring-energized filled-PTFE cap seal design provides smooth movement, low friction and wear in low- to medium-duty piston sealing applications. The small axial seal height reduces piston height, weight and cost. Commonly used in hydraulic presses, machine tools, injection molding machines and mobile hydraulics. Retro fits seals of similar design.

Piston Seal additive

– Non-symmetrical piston seals provided by AHPSeals are not centered in the piston groove (Fig.2) and provide sealing contact with the piston across the entire surface of the static inside seal diameter (Fig. 2a) for improved static and low pressure sealing.

Heavy-Duty No-Drift Bi-Directional Hydraulic Piston Seal The design includes an integrated rubber quad ring seal in the outer filled-PTFE cap to ensure positive sealing and drift-free operation in heavy-duty service application for large diameter piston sealing applications. Designed to separate and seal two different media, e.g. fluid/gas. Commonly used in piston accumulators, mobile hydraulics and where low-friction, high-pressure drift-free sealing performance is required. Retro fits seals of similar design.

The design includes an integrated rubber quad ring seal in the outer filled-PTFE cap to ensure positive sealing and drift-free operation in heavy-duty service application for large diameter piston sealing applications. Designed to separate and seal two different media, e.g. fluid/gas. Commonly used in piston accumulators, mobile hydraulics and where low-friction, high-pressure drift-free sealing performance is required. Retro fits seals of similar design.

Non-symmetrical uni-directional design provides longest service life in medium – to high – pressure hydraulic piston sealing applications. Beveled lip for maximum fluid sealing ability and a stretch fit ensures stability and a tight static seal on the piston. ISO 5597 and many other sizes available.

High-Pressure Hydraulic Piston Seal Non-symmetrical piston seal designed to eliminate seal extrusion in high-pressure systems. The integrated positive actuated live rectangular back-up ring eliminates extrusion, yet allows this seal to be fitted when fitment and assembly are more difficult.

Medium-Duty Bi-Directional Piston Seal with Live Wear Rings Squeeze-type piston seal for use on vertical or no-drift piston. Live wear rings handle greater side load and extrusion gaps. Requires split piston design for smaller diameters for easier fitment. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost. Ideally suited to cylinders constantly operating at a vertical angle.

High-pressure compact piston seal design. The design utilizes two positively actuated live anti-extrusion back-up rings to support very high pressure from both sides. Available in Viton®, Nitrile, H-Nbr, Aflas® and other materials to retrofit standard O-ring grooves designed for no back-up, single, or two back-up rings. Retro fits seals of similar design.

*Maximum values depend on seal material, seal configuration, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Data provided are guidelines for ideal operating conditions. Seals cannot be operated at their upper pressure and speed ratings at the same time. For maximum seal life expectancy, do not operate your seal beyond 75% of any of its operating limits. Please consult engineering or call 1-800-283-7140 for advice.

Heavy-Duty Bi-Directional Compact Piston Seal with Wear Rings Squeeze-type piston seal with integrated L-shaped wear rings for use on vertical or no-drift piston. Energizer allows fit on one-piece pistons. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost.

Low-Friction Bi-Directional Hydraulic Piston Seal O-ring-energized filled-PTFE cap seal design provides smooth movement, low friction and wear in low- to medium-duty piston sealing applications. The small axial seal height reduces piston height, weight and cost. Commonly used in hydraulic presses, machine tools, injection molding machines and mobile hydraulics. Retro fits seals of similar design.

T-Seal High-Pressure Bi-Directional Piston Seal High-pressure compact piston seal design. The design utilizes two positively actuated live anti-extrusion back-up rings to support very high pressure from both sides. Available in Viton®, Nitrile, H-Nbr, Aflas® and other materials to retrofit standard O-ring grooves designed for no back-up, single, or two back-up rings. Retro fits seals of similar design.

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Any purchases resulting from information provided by American High Performance Seals, Inc., including proposals, recommendations and quotes, are subject to “AHPSEALS TERMS AND CONDITIONS OF SALE.”

O-ring-energized cap seal design. The specially designed hard wearing, 60 shore D, self-lubricated polyurethane cap is much easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes up to 10,000psi. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

Long-Life Light-duty Piston Seal Non-symmetrical uni-directional design provides longest service life in light-duty, low-friction hydraulic and pneumatic applications. The thin, flexible lip design quickly responds to low pressure and provides smooth movement with less breakaway force. Beveled lip for maximum fluid sealing ability and a stretch fit ensures stability and a tight static seal on the piston.

– Non-symmetrical piston seals are seals where the shape of the outside diameter lip differs from the inside diameter (see Fig.1, outside lip shorter than inside lip).

Designed with integrated positive actuated live trapezoidal back-up ring to eliminate seal extrusion in high-pressure applications where cushioning can take place and exposes the seal to ultra-high pressure spikes and where low-pressure start up may be present. To avoid potential seal failure, do not use energizer-loaded seals for back-to-back bi-directional piston sealing applications.

Heavy duty, linear and reciprocating dynamic sealing applications. Capable of handling high pressure spikes, larger running clearances and extrusion gaps.

– Seal material: Typically, a harder seal material will increase the extrusion resistance and pressure rating of a seal compared to a softer seal material. The typical hardness range for dynamic elastomeric hydraulic seals is 85-95 Shore A (similar to car tires). AHPSeals offers a variety of high-performance sealing materials in different hardness to meet the most challenging high-pressure sealing applications.

Premium Ultra-High Pressure Bi-Directional Piston Seal with Load-Bearing Live Back-Up Rings Heavy-duty squeeze-type no-drift piston seal, L-shaped heavy-duty load bearing active back-up rings handle larger clearances, elevated temperatures, misalignment and high pressures. Rubber energizer allows for fitting on a one-piece piston design.

– Squeeze Seals typically incorporate an energizing rubber element and are generally characterized by high friction, high wear and good low-pressure sealing. Squeeze type seals with a PTFE cap are characterized as low friction seals under pressure. To avoid a pressure trap between two seals and potential seal failure, do not use squeeze seals for back-to-back bi-directional piston sealing applications.

Designed for very low friction, extreme temperature service (cryogenic to high temperature), or chemically aggressive environments. Spring provides constant load to the beveled seal lip for best sealing performance under harsh conditions. A variety of different seal lip and spring configurations are available to meet specific sealing requirements. Go to Spring-Energized PTFE Seals for detailed information.

Split Ultra-High Pressure Bi-Directional Hydraulic Piston Seal Split piston cap seal for high-pressure heavy-duty piston sealing applications. The hard wearing, self-lubricated Nylon cap is step cut for easy installation without special installation tools and provides high extrusion resistance for ultra-high pressure spikes up to 12,500psi. This seal is capable of repeatedly passing over cylinder ports. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface.

Pressure: up to 10,000psi (700bar)*. For pressures exceeding 5,000psi (350bar), please contact engineering for clearances. Pressure rating can be increased by reducing clearances.

Ultra-High Pressure Bi-Directional Piston Seal with Load-Bearing Live Back-Up Rings Heavy-duty squeeze-type piston seal for use on vertical or no-drift piston. L-shaped heavy-duty back-up rings handle larger clearances, misalignment and high pressures and are also easier to assemble. Maximum pressure rating 10,000psi dynamic and 20,000psi static. Requires split piston design for smaller diameters for easier fitment.

Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation for hydraulic cylinders over a wide range of high-pressure sealing applications. Back-up rings handle larger clearances, elevated temperatures, misalignment, high pressures and ultra-high pressure spikes. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

Non-symmetrical uni-directional design provides longest service life in light-duty, low-friction hydraulic and pneumatic applications. The thin, flexible lip design quickly responds to low pressure and provides smooth movement with less breakaway force. Beveled lip for maximum fluid sealing ability and a stretch fit ensures stability and a tight static seal on the piston.

Premium Ultra-High Pressure Hydraulic Piston Seal Non-symmetrical single-acting seal design with integrated positive actuated live trapezoidal back-up ring to eliminate seal extrusion in high-pressure systems, or if the seal experiences ultra-high pressure spikes, larger extrusion gaps and/or elevated temperatures. ISO 5597 and many other sizes available.

Low-Footprint Bi-Directional Piston Seal Squeeze-type piston seal for use on vertical or no-drift piston applications. Small footprint allows for fitment in confined areas. Economical double-acting hydraulic piston seal.

– Lip Seals are without any energizing rubber elements. Therefore, they provide a more flexible dynamic seal lip and are generally characterized by lower friction, resulting in reduced wear, longer seal life and moderate low-pressure sealing capabilities.

Medium-Duty Bi-Directional Compact Piston Seal with Wear Rings Squeeze-type piston seal with integrated L-shaped wear rings for use on vertical or no-drift piston. Requires split piston design for smaller diameters for easier fitment. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost.

This is a proprietary urea grease of NSK featuring low dust emission exclusively for ball screws and linear guides which are used in clean rooms.

PTFE cap seal providing low friction and long service life over a wide range of light-duty bi-directional service applications. The thin PTFE cap is more responsive to low-pressure sealing applications and can be used for pneumatic and light-duty hydraulic sealing.

Spring-Loaded PTFE Piston Seal Designed for very low friction, extreme temperature service (cryogenic to high temperature), or chemically aggressive environments. Spring provides constant load to the beveled seal lip for best sealing performance under harsh conditions. A variety of different seal lip and spring configurations are available to meet specific sealing requirements. Go to Spring-Energized PTFE Seals for detailed information.

– Back-up rings: The proper design of a seal with a back-up ring will increase the pressure rating of a seal as long as the back-up ring is made of material with a higher modulus than the seal (typically noted as a harder material). AHPSeals offers specific rod and piston seals with integrated back-up rings to increase pressure capability.

Pressure: up to 5,000psi (350bar)*. For pressure above 3,800psi (260bar), please contact engineering for clearances. Pressure ratings can be increased by reducing clearances.

Squeeze-type piston seal for use on vertical or no-drift piston. Live wear rings handle greater side load and extrusion gaps. Requires split piston design for smaller diameters for easier fitment. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost. Ideally suited to cylinders constantly operating at a vertical angle.

– Beveled seal lip, or chamfered seal lip, is the most aggressive seal lip design. Most of our piston seals feature this lip design as it provides the best fluid film-breaking ability, which provides the best sealing performance. Sealing lips for all AHPSeals’ piston seals are precision machined for a sharp sealing edge that cannot be achieved by a net-molding process (Fig.3).

Premium High-Pressure Bi-Directional Hydraulic Piston Seal Rectangular energized cap seal design for high-pressure piston sealing applications. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The specially designed hard wearing cap is easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Non-symmetrical single-acting seal design with integrated positive actuated live trapezoidal back-up ring to eliminate seal extrusion in high-pressure systems, or if the seal experiences ultra-high pressure spikes, larger extrusion gaps and/or elevated temperatures. ISO 5597 and many other sizes available.

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Application-specific and proprietary piston seal designs are available. Please contact engineering to get the best seal for your piston sealing applications.

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Non-symmetrical seal design provides long service life in applications with worn rods and old equipment. Good contamination exclusion but reduced sealing performance due to the knife-edge seal lip design.

– Wear rings: The use of wear rings always leads to larger extrusion gaps compared to a close-tolerance sliding bearing design without wear rings. The above-metal exposed portion of the wear ring and tolerances are the dominating factors for the need for larger clearances between the two sealing surfaces.

Low-Friction No-Drift Bi-Directional Hydraulic Piston Seal The design includes an integrated rubber quad ring seal in the outer filled-PTFE cap to ensure positive sealing and drift-free operation in medium- to heavy-duty service application. Designed to separate and seal two different media, e.g. fluid/gas. Commonly used in piston accumulators, mobile hydraulics and where low-friction, high-pressure drift-free sealing performance is required. Retro fits seals of similar design.

Split piston cap seal for high-pressure heavy-duty piston sealing applications. The hard wearing, self-lubricated Nylon cap is step cut for easy installation without special installation tools and provides high extrusion resistance for ultra-high pressure spikes up to 12,500psi. This seal is capable of repeatedly passing over cylinder ports. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface.

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Squeeze-type piston seal for use on vertical or no-drift piston applications. Small footprint allows for fitment in confined areas. Economical double-acting hydraulic piston seal.

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Rectangular energized cap seal design for high-pressure piston sealing applications. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The specially designed hard wearing cap is easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

– Rounded seal lip is the least aggressive sealing lip and is typically used in pneumatic applications to maintain a microscopically thin oil or grease film on the bore to keep the piston bearing and seal lubricated (Fig. 6).

Squeeze-type piston seal for use on vertical or no-drift piston. Positive actuated live back-up rings to eliminate seal extrusion in high-pressure applications or larger extrusion gaps. Requires split piston design for smaller diameters for easier fitment.

Premium Ultra-High Pressure Loaded Hydraulic Piston Seal Designed with integrated positive actuated live trapezoidal back-up ring to eliminate seal extrusion in high-pressure applications where cushioning can take place and exposes the seal to ultra-high pressure spikes and where low-pressure start up may be present. To avoid potential seal failure, do not use energizer-loaded seals for back-to-back bi-directional piston sealing applications.

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Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation of hydraulic cylinders over a wide range of medium- to high-pressure sealing applications. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

American High Performance Seals manufactures a comprehensive range of piston seal designs, including lip seals, PTFE cap seals, compact-squeeze type seals and application–specific designed seals made from high-performance elastomers and engineered plastic materials to offer maximum durability and sealing performance.

The function of the piston seal is to ensure that pressurized fluid or other media does not by-pass the piston as the system pressure pushes the piston down the cylinder during a pressure cycle.

Hydraulic Piston Seal for Contamination Exclusion Non-symmetrical seal design provides long service life in applications with worn rods and old equipment. Good contamination exclusion but reduced sealing performance due to the knife-edge seal lip design.

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Low-Friction Bi-Directional Piston Seal PTFE cap seal providing low friction and long service life over a wide range of light-duty bi-directional service applications. The thin PTFE cap is more responsive to low-pressure sealing applications and can be used for pneumatic and light-duty hydraulic sealing.

American High Performance Seals assumes no obligation or liability for any advice furnished or results obtained with respect to these products. All such advice is given and accepted at the buyer’s risk.

Piston seal types

Squeeze-type piston seal with integrated L-shaped wear rings for use on vertical or no-drift piston. Requires split piston design for smaller diameters for easier fitment. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost.

Pneumatic piston seal

This information, based on our experience, is offered as part of our service to customers. It is intended for use by persons having technical skill, at their own discretion and risk. We do not guarantee favorable results, and we assume no liability in connection with its use.

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Heavy-Duty Bi-Directional Piston Seal with Live Back-Up Rings Squeeze-type piston seal for use on vertical or no-drift piston. Positive actuated live back-up rings to eliminate seal extrusion in high-pressure applications or larger extrusion gaps. Rubber energizer allows for an easier fit on one-piece pistons.

– Knife-edge and straight seal lip designs offer good scraping properties but reduced sealing performance and are used for sealing applications with high fluid contamination (Fig.4 and 5).

Squeeze-type piston seal for use on vertical or no-drift piston. Rubber energizer allows for easier fit on a one-piece piston. Live wear rings handle greater side load and extrusion gaps. Compact design includes piston wear ring for small axial seal height, reducing piston height, weight and cost. Ideally suited to cylinders constantly operating at a vertical angle.

Rod seal