The UDI type piston rod seal is a classic U-cup dynamic seal developed for reciprocating hydraulic cylinder rods. Mounted within the cylinder gland, it functions as the main sealing element to block hydraulic oil escaping from the cylinder interior, sustaining stable pressure during continuous rod movement.
Crafted from premium polyurethane material, the UDI rod seal adopts a refined U-shaped lip profile. When hydraulic pressure acts on the seal, the lip expands outward and closely presses against the sliding rod surface to form an effective sealing barrier. It features outstanding wear resistance, low compression set and reliable anti-extrusion performance. The optimized lip geometry maintains a thin lubricating oil film on the rod, lowering friction and heat generation to reduce abrasion of both seal and rod surface. It is compatible with most standard hydraulic oils and keeps stable sealing performance over a normal working temperature range.
UDI seals follow standard groove specifications, enabling easy assembly and direct replacement with no extra machining required. It is widely applied in medium-duty hydraulic machinery such as construction equipment, forklifts, agricultural machines and hydraulic power stations. The UDI piston rod seal effectively controls external oil leakage, helping operators cut oil consumption and unplanned maintenance downtime. For OEM cylinder manufacturing and aftermarket spare parts supply, the UDI type rod seal offers a dependable and economical dynamic sealing solution.
Original text from: Hydraulic and Pneumatic Seals https://www.bszzseal.com/
