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Piston Seals
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The Right Piston Seal for Optimum Performance
The main function of piston seals is to provide a reliable sealing between the piston and the cylinder tube to ensure efficient and low-friction movement of the piston. It is crucial that the seals fulfill their function even under extreme conditions such as high pressures, strong temperature fluctuations and chemical influences.
In addition to high wear resistance of the seal itself, gentle sliding of the seal on the counter surface of the cylinder tube also contributes to the longevity of the cylinder. Piston seals are an indispensable component in many industrial applications in which hydraulic or pneumatic systems are used. The respective requirements and operating conditions determine the type of piston seal used.
High Functionality Through Suitable Materials
Freudenberg Sealing Technologies uses piston seals in a variety of modern sealing systems that are specially adapted to the respective application conditions and requirements. The choice of material plays a decisive role here.
Materials such as polyurethane, PTFE and polyamides are predominantly used for piston seals, which, in combination with the company's proven geometries, always offer the optimum solution. Extensive test series and millions of customer applications confirm the performance and reliability of our seals.
Thanks to our hydraulic selector, customers can quickly and easily configure the right sealing system for their needs.
Omegat OMK PU Made of 98 AU 30500 as an Alternative to PTFE Piston Seals in Mobile Hydraulics
Freudenberg Sealing Technologies presents an innovative solution for sealing pistons in hydraulic cylinders as an alternative to PTFE piston seals. The profile ring of the two-component piston seal is made of the new, hydrolysis-resistant high-performance polyurethane 98 AU 30500 and is supported in its sealing function by an O-ring as a preload element. Learn more on our High Performance Piston Seals.
The material 98 AU 30500 has further advantages compared to conventional polyurethane solutions, including higher wear resistance, lower abrasion of the counter surfaces, lower dynamic friction and high media resistance. The sum of its properties makes the new material the ideal candidate for replacing PTFE sealing solutions. Learn more about the material.
Our Products in Detail
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Merkel® Chevron Seal EK/EKV
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Merkel® Compact Seal L 27
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Merkel® Compact Seal T 42
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Merkel® Compact Seal T 44
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Merkel® U-ring 0215
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Merkel® U-ring 0217
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Merkel® Nutring 0504
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Merkel® Nutring TMP 21
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Merkel® Omegat OMK-DR HB
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Merkel® Omegat OMK-ES
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Merkel® Omegat OMK-ES PR
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Merkel® Omegat OMK-MR
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Merkel® Omegat OMK-QR
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Merkel® Omegat OMK-S
Merkel® Chevron Seal EK/EKV
Multi-element piston seal, consisting of thrust ring, a sleeve and a back-up ring. For robust areas of application, mainly for the supply of replacement parts for existing installations.
Merkel® Compact Seal L 27
Multi-element piston seal for pistons that are pressurizable on both sides. Major gap bridging. Activated back rings offer significant protection against extrusion.
Merkel® Compact Seal T 42
Multi-element piston seal for pistons that are pressurizable on both sides. Suited for use in mining (rams, advancing cylinders in progressive extension).
Merkel® Compact Seal T 44
Multi-element piston seal for pistons that are pressurizable on both sides. Suited for maximum pressure loads in mining (rams, advancing cylinders in progressive extension).
Merkel® U-ring 0215
Single-action, two-element piston seal for use in hydraulic and pneumatic applications. Fabric reinforcement on the running surface.
Merkel® U-ring 0217
Single-action, two-element piston seal for use in hydraulic and pneumatic applications. Shortened fabric reinforcement on the running surface.
Merkel® Nutring 0504
Two-element piston seal with asymmetrical polyurethane profile ring and back ring. Among other purposes, usable as an individual seal in a pressure range up to 50 MPa and for the bridging of large seal gaps.
Merkel® Nutring TMP 21
Single-action piston seal made of abrasion-resistant polyurethane. For heavy pneumatic demands and high operating requirements.
Merkel® Omegat OMK-DR HB
Merkel® Omegat OMK-DR HB Three-element piston seal for combined lifting and turning movements. Protection against joint rotation in the event of turning movements, due to profile contact surface on the O-ring.
Merkel® Omegat OMK-ES
Two-element piston seal for pistons that are pressurizable on one side. Especially suited to large diameters and suited to heavy-duty hydraulic applications.
Merkel® Omegat OMK-ES PR
Two-element piston seal, consisting of one PTFE profile ring with pressure release function and skids as well as an elastomer profile ring as a pre-stress element. For heavy-duty, demanding applications.
Merkel® Omegat OMK-MR
Two-element piston seal, consisting of a PTFE profile ring and an O-ring as a pre-stress element. For pistons that are pressurizable on two sides.
Merkel® Omegat OMK-QR
Two-element piston seal, consisting of a PTFE profile ring and an elastomer profile ring as a pre-stress element. For pistons that are pressurizable on two sides, demanding applications and large diameters.
Merkel® Omegat OMK-S
Two-element piston seal, consisting of a PTFE profile ring and an elastomer profile ring as a pre-stress element. For heavy-duty hydraulic applications.
Related Topics
3D Animations
Discover our innovative sealing solutions for use in Hydraulic Applications
in the new 3D animations!
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Solutions Sheets
OMK-PU AU 30500 - Alternative to PTFE Piston Seals
A two piece piston seal produced in Freudenberg’s new hydrolysis resistant, high performance polyurethane combined with an Oring energizer as a potential alternative to piston seals with a PTFE sealing element.
HDP 330 High-Pressure Piston Seals
The special polyamide HDP 330 seal complements the Merkel® piston seal program for the installation space DIN ISO 7425-1. This seal withstands the most extreme pressures (up to 800 bar) and allows for use of rougher cylinder liner surfaces, which can cut cylinder production costs.
TR200 T-Ring
The Freudenberg Sealing Technologies TR200 T-Ring is an innovative actuating low-friction piston seal used in directional control valves for pneumatic cylinder applications.
D-JACK Seals
D-JACK seals were developed for all piston applications. D-Ring meets PTFE: a match made in your engine. The D-Jack is a friction optimized seal for all dry lubricated piston applications.
Bonded piston seals
Bonded piston seals (BPS) from Freudenberg Sealing Technologies prove to be an exceptional value for the life of your transmission. By combining special elastomers, metal treatment, adhesive solutions, and manufacturing processes, these seals demonstrate superior performance throughout the life of the transmission. The BPS Lead Center is dedicated solely to the bonded piston seal product line, concentrating on in-depth solutions to a critical transmission component.
Merkel® Omegat OMK-ES
Merkel® Omegat OMK-ES is a two-piece seal set for sealing single-acting pistons, consisting of a PTFE profile ring and an elastomer profile ring as a pre-stress element.
Merkel® Omegat OMK-MR
Merkel® Omegat OMK-MR is a two-piece seal set for sealing pistons, consisting of a PTFE Profile ring and an O-ring as the pre-stressing element.
Merkel® Omegat OMK-S
Merkel® Omegat OMK-S is a two-piece seal set for sealing pistons, consisting of a PTFE profile ring and an elastomer Profile ring as a pre-stress element.
Merkel® V-Packing Set EK/EKV
Merkel® V-Packing Set EK/EKV is a multi-part piston seal set comprising one pressure ring, one or two V-shaped rings and one support ring.
The Perfect Cylinder Program for Hydraulic Seals
The Freudenberg-NOK PERFECT CYLINDER program for hydraulic seals optimizes sealing technology to help customers reduce their costs and improve the performance of their machinery.
Related Documents
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