SPGW Combined Seal First Choice for Heavy-Duty and Long-Stroke Hydraulic Cylinders

In the field of engineering machinery, mining machinery and other heavy-duty equipment, long-stroke hydraulic cylinders constantly operate under high pressure and frequent reciprocating motion. Conventional seals are prone to wear, extrusion deformation and internal leakage, seriously affecting equipment stability and service life. Under such harsh working conditions, the SPGW combined seal stands out as the optimal piston seal solution by virtue of its sophisticated composite structure and superior comprehensive performance.

The SPGW is an integrated five-piece piston seal composed of a PTFE wear-resistant sealing ring, rubber elastic body and high-strength PA/POM back-up rings. Featuring a compact and precise structure, it relies on the rubber elastic body to provide continuous preload compensation, while double-sided rigid back-up rings deliver dual protection to achieve efficient bidirectional sealing. It effectively resists high-pressure impact and prevents seal extrusion. Adaptable to standard cylinder clearances and machining tolerances, it is well suited for heavy-load impact conditions, offering far greater adaptability and fault tolerance than ordinary single seals.

Compared with traditional seals, the SPGW combined seal delivers remarkable advantages and can withstand ultra-high working pressure up to 50 MPa with excellent impact resistance, wear resistance and aging resistance.

 Firstly, it balances static and dynamic sealing performance with ultra-low friction and zero crawling. The filled PTFE material eliminates stuttering, crawling and vibration issues common in long-stroke cylinder operation.

Secondly, the composite filled PTFE formula further reduces friction coefficient and operational resistance.

Thirdly, it tolerates certain extrusion gaps and is less susceptible to damage even if minor impurities exist in hydraulic oil.

Fourthly, it features a simple groove structure and back-up rings with diagonal cuts, greatly enhancing extrusion resistance, minimizing wear and enabling easy installation.             

Fifthly, a single set realizes bidirectional piston sealing, shortening piston structure length and effectively reducing overall costs.

With outstanding adaptability and durability, SPGW combined seals are widely applied to heavy-duty long-stroke cylinders of excavators, loaders, mining equipment, large hydraulic presses and other core machinery, covering diverse harsh industrial and engineering hydraulic scenarios. With reliable sealing performance, it solves long-standing sealing pain points of heavy hydraulic cylinders, supports stable and efficient long-term operation, and serves as a core sealing component to improve equipment stability and reduce operational costs.