D-Ring (D 令) type piston and face seal is a D-shaped elastomer sealing element suitable for piston dynamic sealing and end face static sealing applications. Unlike conventional O-rings, its flat back design prevents twisting and rolling during reciprocating motion. The D-Ring maintains stable contact pressure against mating surfaces to block hydraulic fluid leakage and works well for both piston sealing and end face sealing scenarios.
Manufactured from premium nitrile or polyurethane material, the D-Ring seal delivers good elasticity, outstanding wear resistance and stable compression performance. Its unique D profile effectively avoids spiral failure under pressure fluctuation. It can withstand working pressure up to 32 MPa and operates reliably within the temperature range of -30℃ to 100℃, with excellent resistance to mineral hydraulic oil.
Compatible with mineral hydraulic oil and most conventional hydraulic fluids, D-Ring seals are widely used in excavators, loaders, injection molding machines and general hydraulic equipment. It fits standard groove sizes for simple assembly and direct replacement. Reducing leakage risk and resisting twisting damage, the D-Ring provides a reliable static and dynamic sealing solution for hydraulic piston and end face sealing systems.
Original text from: Hydraulic and Pneumatic Seals https://www.bszzseal.com/
