The UDR type piston rod seal is a U-profile dynamic sealing component specially designed for reciprocating hydraulic cylinder rods. Installed inside the gland assembly, its core task is to prevent hydraulic oil leakage from the cylinder while maintaining stable sealing performance during continuous back-and-forth rod movement.
Manufactured from high-quality polyurethane, the UDR rod seal features a precision-formed U-lip structure. Under hydraulic pressure, the lip expands to maintain uniform contact pressure on the piston rod surface. It delivers excellent wear resistance, low compression set and decent anti-extrusion ability. The optimized lip design creates a thin lubricating oil film on the rod, which lowers friction and reduces heat generation without sacrificing sealing effect. It works compatibly with most common hydraulic oils and remains stable within a typical working temperature range.
The UDR seal conforms to standard groove dimensions, supporting quick installation and direct replacement for both OEM cylinder production and aftermarket maintenance. It is widely used on medium-duty hydraulic equipment including construction machinery, forklifts, agricultural machines and hydraulic power units. By controlling external oil leakage, the UDR piston rod seal protects the hydraulic system, reduces fluid waste and cuts unexpected downtime. It is a practical and cost-effective primary rod sealing choice for fluid power applications.
Original text from: Hydraulic and Pneumatic Seals https://www.bszzseal.com/
