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GSD is a unidirectional sealing ring for pistons, consisting of a wear-resistant filled polytetrafluoroethylene (PTFE) ring and an O-ring rubber seal. The O-ring provides elasticity and compensates for the wear of the PTFE ring, resulting in a unidirectional sealing effect. It is suitable for sealing hydraulic cylinder pistons and is commonly used in conjunction with a guide ring to enhance sealing performance.

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