198-13-42710 1981342710 SEAL RING OF D475A-5E0 D475A-5

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5. FAQ

Q: What special reinforcing material is added into the PTFE piston seal ring?
A: Purified reed stem fiber is evenly blended into the PTFE substrate. It improves structural rigidity and reduces reciprocating wear caused by continuous cylinder movement, while resisting deformation from long exposure to hydraulic fluid.

Q: What visual features help customers distinguish this piston seal ring set from ordinary sealing parts?
A: The main sealing ring presents matte off-white with uniform fine fiber texture. The elastic backup ring is solid black, and the anti-extrusion spacer is light beige. Each component has precise dimensional tolerance for direct assembly.

Q: What structural design is adopted to adapt to reciprocating motion inside the hydraulic cylinder?
A: It adopts combined composite structure integrating PTFE sealing ring and elastic rubber backup ring. The matched profile fits piston grooves perfectly, realizing bidirectional pressure sealing inside hydraulic cylinders.

Q: What working temperature range can this piston seal ring work stably within?
A: Its applicable temperature range covers -160°C to 440°C, suitable for cold-region winter engineering construction and continuous medium-load excavation work in high-temperature open quarries.

Q: Can this piston seal ring be installed on hydraulic cylinders of all construction machinery?
A: It is dimensionally customized exclusively for medium crawler excavator hydraulic cylinder piston grooves. It cannot be used on road grader cylinders, wheel loader assemblies or large excavator hydraulic components of other machine series.

Q: What maximum sustained hydraulic pressure can this combined piston seal withstand steadily?
A: It can endure continuous static hydraulic pressure ranging from 6.42MPa to 7.22MPa. The elastic backup ring absorbs pressure surges during cylinder operation and avoids internal oil leakage inside the cylinder.

Q: What engineering projects commonly require replacement of this piston seal ring?
A: It serves routine maintenance of hydraulic cylinder piston sealing assemblies on medium crawler excavators, widely used in urban infrastructure, highway subgrade construction, small quarry loading and residential foundation excavation projects.

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