The UPH type seal is a versatile U-shaped hydraulic seal that can be used on both pistons and piston rods, offering flexible sealing solutions for reciprocating hydraulic cylinder systems. Thanks to its symmetrical U-shaped structure, the UPH seal can serve as a piston seal to control internal leakage or work as a rod seal to prevent external oil leakage. This dual-purpose design helps seal suppliers and OEM manufacturers reduce spare part varieties and simplify inventory management.
Made of high-strength polyurethane material, the UPH dual-use seal has outstanding wear resistance, low compression set and good anti-extrusion performance. When hydraulic pressure is applied, the U lip expands and presses tightly against the metal sliding surface to form a reliable sealing barrier. It maintains low friction during continuous reciprocating motion, minimizing heat buildup and surface abrasion. The material is compatible with most conventional hydraulic oils and performs steadily within a wide working temperature range.
The UPH seal fits standard sealing grooves, so no extra machining is needed during installation. It is widely used in light and medium-load hydraulic equipment such as forklifts, agricultural machinery, small hydraulic presses and material handling cylinders. Adopting UPH piston and rod dual-purpose seals effectively reduces oil leakage and improves hydraulic cylinder stability. It is a cost-effective sealing choice for new cylinder assembly and aftermarket seal replacement.
Original text from: Hydraulic and Pneumatic Seals https://www.bszzseal.com/
