Special seals for construction machinery gas seal piston rods are key components to ensure the normal operation of construction machinery pneumatic systems. The following are some common types and characteristics:
Shaft seal: It is composed of a slip ring filled with polytetrafluoroethylene (PTFE) and a rubber O-ring. It is a one-way sealing element, which has the advantages of good anti-extrusion performance, stable size, no crawling phenomenon, etc. It can maintain excellent sealing effect under high, medium and low pressure and heavy load and high-frequency working conditions. It is widely used in hydraulic reciprating systems such as excavators and bulldozers.
UDI piston rod seal: a typical lip seal, with a low inner lip and a high outer lip, and the materials include TPU polyurethane, NBR nitrile rubber, etc. It has excellent wear resistance and is not sensitive to impact loads and pressure peaks. It is suitable for piston rod sealing in heavy-duty walking machinery or industrial hydraulics.
Fluororubber gas seal: with fluororubber (FKM) as the substrate, it has the characteristics of high temperature resistance, aging resistance, strong gas barrier and so on. Its molecular structure is dense, which can effectively reduce gas leakage, and the compression deformation rate is low. It can maintain a stable sealing effect under a variety of complex working conditions. It is often used for piston rod sealing of pneumatic cylinders and valve equipment.
SPGW type seal: usually composed of polytetrafluoroethylene piston seal friction ring, special-shaped aluminum alloy loaded nitrile rubber elastomer and polyformaldehyde support ring. It has low friction coefficient, good wear resistance and anti-squeezing performance, and can adapt to a wide temperature and pressure range. It is mainly used for hydraulic cylinder sealing of heavy or construction machinery such as excavators and loaders.
Original source: Hydraulic seal https://www.bszzseal.com/
