dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Bidirectional Hydraulic Seal

Polypac's Bidirectional Hydraulic Seal provides reliable sealing in both directions for cylinders and valves. Built with advanced materials and precision manufacturing, it delivers low friction, long life, and customizable options for harsh working conditions.

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Product Information

Product Overview

The Polypac Bidirectional Hydraulic Seal is engineered to provide dependable sealing performance in applications where pressure and movement occur from both directions. Ideal for hydraulic cylinders, double-acting pistons, and valve systems, this seal combines low friction, excellent wear resistance, and stable sealing under varying temperatures and pressures.

Key Features

Bidirectional sealing design for reliable performance in double-acting systems
Low friction profile to reduce stick-slip and improve response
High wear and extrusion resistance for extended service life
Wide temperature and chemical compatibility with multiple elastomers and filled PTFE options
Precision manufacturing and strict quality testing to ensure consistency

Materials & Compatibility

Polypac offers these seals in a range of materials to match application needs: PTFE composites (bronze, carbon, graphite, MoS₂, glass-filled) and elastomers such as NBR, FKM, EPDM, silicone, and FFKM. Custom blends and hard/soft element combinations are available for special working conditions and aggressive fluids.

Applications & Benefits

Common uses include hydraulic cylinders, ram pistons, industrial valves, mobile machinery, and marine equipment. Users benefit from:

Improved reliability and reduced downtime due to robust sealing performance
Lower maintenance costs from longer seal life and predictable wear
Enhanced system efficiency thanks to reduced leakage and friction
Easy retrofit and installation with standardized sizes or tailored dimensions

Why Choose Polypac

Founded in 2008, Polypac combines advanced production equipment and over 10,000 m² factory space with ongoing R&D partnerships with universities and research institutes. As a leading seal manufacturer and oil seal supplier in China, we emphasize customized solutions, rigorous testing, and responsive technical support—ensuring each Bidirectional Hydraulic Seal meets your performance and durability needs.

Contact Polypac for technical consultation, sample testing, or a custom sealing solution tailored to your operating conditions.

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Question you may concern

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

How important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

Let's talk

PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

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