Standard & Custom Hydraulic Seals

Hydraulic Seals & Custom Sealing Solutions

EPM supplies hydraulic seals for hydraulic cylinders, pumps, valves, and industrial equipment, including rod seals, piston seals, O-rings, wipers, wear rings, U-cups, buffer seals, and rotary shaft seals. Available in a range of profiles, sizes, and materials, our sealing solutions help prevent fluid leakage, maintain pressure, and support reliable equipment performance.

From standard replacement seals to custom solutions for hard-to-find or obsolete components, EPM helps customers identify suitable sealing options for their specific requirements. Whether you have a part number, drawing, dimensions, or an existing seal sample, we can help you explore the next steps.

Hydraulic Seal Types

Different sealing profiles perform specific functions depending on equipment design, pressure, movement, and operating conditions. EPM's hydraulic seal range includes:

• Rod Seals: Help prevent fluid leakage along moving piston rods.
• Piston Seals: Maintain pressure between the piston and cylinder bore.
• Symmetrical Seals: Suit compatible rod or piston sealing arrangements.
• U-Cup Seals: Provide dynamic sealing in suitable hydraulic applications.
• V-Rings: Provide sealing or contaminant protection in compatible applications.
• Wiper Seals: Help prevent contaminants from entering hydraulic cylinders.
• Rotary Shaft Seals: Help retain lubricants around rotating shafts.
• Wear Rings and Guide Rings: Guide components and reduce metal-to-metal contact.
• O-Rings and Static Seals: Seal mating components in suitable applications.
• Back-Up Rings: Help reduce seal extrusion under pressure.
• Buffer Seals: Help protect primary seals from pressure spikes.
• Oil and Grease Seals: Help retain lubricants and control contamination.
• Cast Iron Piston Rings: Provide sealing and guidance in compatible equipment.
• Gaskets: Help prevent leakage between stationary mating surfaces.

Need a specific profile or a replacement for an existing component? EPM can help you identify the relevant seal type and requirements.

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Single-Acting and Double-Acting Hydraulic Seals

Hydraulic seals are designed for different pressure directions and movement requirements. Single-acting seals are designed to seal pressure acting primarily from one axial direction, while double-acting seals are designed to seal pressure from either direction in compatible applications involving reciprocating movement.

The right configuration depends on the cylinder design, seal profile, pressure conditions, and intended application.

Hydraulic Seal Materials

EPM's hydraulic sealing solutions can involve a variety of elastomers, thermoplastics, and engineered compounds. Material selection depends on hydraulic fluid compatibility, operating temperature, pressure, friction, wear resistance, and the demands of the application.

• Nitrile Rubber (NBR): Commonly used for resistance to many petroleum-based oils.
• Polyurethane (PU): Offers abrasion resistance and mechanical strength.
• FPM / FKM: Used where resistance to elevated temperatures and compatible fluids is required.
• EPDM: Suitable for certain water-based fluids and other compatible media.
• Silicone: Offers flexibility across a broad temperature range in suitable applications.
• PTFE: Provides low friction and broad chemical resistance.
• Bronze-Filled PTFE: Used for enhanced wear and deformation resistance in suitable designs.
• Nickel-Filled PTFE: Provides specialized composite properties depending on formulation.
• Glass-Filled PTFE: Offers increased stiffness and dimensional stability.
• POM (Acetal): Provides rigidity and dimensional stability.
• Nylon: Offers mechanical strength and wear resistance.
• Leather and Fabric-Reinforced Rubber: Used in certain traditional or specialist applications.
• Cast Iron: Used in compatible piston ring designs.

EPM can help you assess suitable material options for your application. The correct compound must be compatible with the operating fluid, temperature, pressure, and environmental conditions.

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Standard and Custom Hydraulic Seals

Not every application can be served by a standard seal. Custom hydraulic seals may be required when a component is obsolete, difficult to source, dimensionally unusual, or designed for specific operating conditions.

EPM can help customers explore sealing solutions based on existing part numbers, measurements, technical drawings, samples, and application details. Providing accurate specifications helps establish the requirements for identifying or developing a suitable seal.

How to Choose the Right Hydraulic Seal

Choosing the correct hydraulic seal involves more than matching its diameter. Consider the following requirements:

• Application: Rod, piston, rotary, static, or other sealing function.
• Dimensions: Shaft or bore diameter, groove dimensions, and seal cross-section.
• Pressure: Normal operating pressure and potential pressure spikes.
• Temperature: Minimum and maximum operating temperatures.
• Fluid compatibility: Hydraulic oil or other operating media.
• Movement: Reciprocating, rotary, or stationary operation.
• Environment: Contamination, surface finish, wear, and expected service life.

If you're unsure which specifications matter for your application, EPM can help you identify the information needed to evaluate your sealing requirements.

Find Your Hydraulic Seal with EPM

Whether you need a standard replacement, help identifying an existing seal, or a custom solution for a challenging application, EPM can help you explore the available options. Send us your part number, dimensions, drawing, or sample details to get started.

Request a Custom Seal Solution by Contacting EPM