The USH type seal is a versatile U-shaped sealing element suitable for both piston and rod positions in hydraulic cylinders, widely recognized as a popular all-in-one sealing solution for fluid power systems. Thanks to its symmetrical U-profile design, the USH seal can be installed either on the piston for internal sealing or on the cylinder rod for external sealing, which simplifies spare part inventory for equipment manufacturers and seal distributors.
Produced from high-quality polyurethane, the USH dual-purpose seal possesses excellent wear resistance, low compression set and good extrusion resistance. During reciprocating operation, the U-lip automatically expands under hydraulic pressure to maintain tight contact against the mating metal surface. It delivers low friction and stable sealing performance under medium working pressure, effectively limiting oil leakage while reducing heat generation. The material is compatible with most standard hydraulic oils and can operate within a broad temperature range.
The USH seal fits standard sealing grooves, requiring no modification to existing cylinder structures. It is commonly applied in light and medium-duty hydraulic equipment such as forklifts, agricultural machinery, small hydraulic presses and handling cylinders. Adopting USH piston and rod seals reduces part categories and stocking costs. It protects hydraulic systems from leakage and improves the overall stability of cylinders, making it a cost-effective sealing option for OEM assembly and aftermarket replacement.
Original text from: Hydraulic and Pneumatic Seals https://www.bszzseal.com/
