2026/09/23 PTFE Backup Rings & Wear Rings: Dual Protection for High-Pressure Hydraulic Valves

Why Do High-Pressure Hydraulic Valves Need Backup Rings and Wear Rings?

Under working pressures exceeding 10–15 MPa (approx. 100–150 bar), conventional rubber O-rings or standard elastomer seals are prone to extrusion into clearance gaps due to high differential pressure, causing shear damage and fluid leakage. Furthermore, during frequent switching and movement, valve spools can suffer from eccentric wear and jamming if proper guidance and structural support are lacking.

Dual Protection Architecture
PTFE Backup Ring: Installed on the low-pressure side of the O-ring to fill the metal clearance gap, preventing seal extrusion and damage under severe pressure.
PTFE Wear Ring: Absorbs radial loads, prevents metal-to-metal contact, and ensures stable guidance with enhanced wear resistance.

Key Advantages of Bioshine PTFE Backup Rings & Wear Rings

Engineered with premium modified PTFE materials and high-precision machining, Bioshine PTFE components deliver outstanding reliability for hydraulic systems:
Extrusion Resistance: High tensile strength and creep resistance effectively block seal extrusion under extreme pressure, significantly extending O-ring service life.
Low Friction & Low Wear: Exceptionally low coefficient of friction minimizes stick-slip phenomena, ensuring smooth and responsive valve operation.
Wide Temperature Range: Capable of continuous operation in extreme temperatures ranging from -190°C to +260°C, fitting both high- and low-temperature hydraulic applications.
Superior Chemical Compatibility: Highly resistant to mineral oils, synthetic hydraulic fluids, water-glycol (HFC), and various aggressive chemicals without swelling or degradation.
Flexible Cut Designs: Available in various configurations, including angle/diagonal cuts, for fast and effortless on-site installation and maintenance.

Main Application Areas

Bioshine PTFE backup rings and wear rings are widely used in industrial and mobile hydraulic equipment where high reliability is essential:
Industrial Hydraulic Valves: Servo valves, proportional valves, directional control valves, and pressure control valves
Heavy Construction Machinery: Hydraulic cylinders and valve blocks for excavators, loaders, and cranes
Injection Molding & Die-Casting: High-frequency, high-pressure hydraulic systems
Marine & Wind Energy: Deck machinery and wind turbine pitch control hydraulic systems in highly corrosive environments

For detailed product specifications or technical consultation, please feel free to contact the Bioshine sales team:
Official Website: https://www.bspflon.com