VIIPLUS SOLUTIONS® Stainless Steel PTFE Composite Bearings combine a reinforced PTFE sliding layer, glass fiber reinforcement, and a stainless steel backing to deliver the strength and dimensional stability of a metallic structure together with the low‑friction and wear‑resistant characteristics of advanced composite bearing materials.
Composite Bearing Material · PTFE Glass Fiber Composite · Metal‑Backed PTFE Composite Sliding Bearing
Engineered for double offset butterfly valves, pumps, marine, energy, and process industry applications.
VIIPLUS SOLUTIONS® Stainless Steel PTFE Composite Bearings utilize a high‑performance woven PTFE and glass fiber composite layer bonded to a metallic backing. This advanced material system provides exceptional resistance to corrosive media, aggressive chemicals, cyclic fatigue, and impact loading. Designed for dry‑running and maintenance‑free operation, it delivers reliable low‑friction performance without requiring additional lubrication.
| Grade | C % | Si % | Mn % | S % | P % | Cr % | Ni % | Mo % | N % | Cu % |
|---|---|---|---|---|---|---|---|---|---|---|
| SS316 Stainless Steel | Min | — | — | — | — | 16.0 | 10.0 | 2.0 | — | — |
| Max | 0.08 | 0.75 | 2.00 | 0.030 | 0.045 | 18.0 | 14.0 | 3.0 | 0.10 | — |
| Grade | Heat Treatment / Supply | SIZE | TS Min, MPa (ksi) | YS Min, MPa (ksi) | EL % GL 50mm, min | Hardness |
|---|---|---|---|---|---|---|
| SS 316 Stainless Steel | Annealed | ALL | 515 (75) | 205 (30) | 40 | — |
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Note: 1. Chemical composition shall meet the limits in Table 1. Test method per applicable ASTM standard. 2. Mechanical properties shall meet Table 2. Test method per applicable ASTM standard. 3. Yield testing by 0.2% offset method for ASTM standard. |
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VIIPLUS SOLUTIONS® Stainless Steel PTFE Composite Bearings are manufactured from an advanced composite system consisting of a reinforced PTFE sliding layer bonded to a stainless steel backing. The engineered PTFE matrix, enhanced with glass fibers and wear‑resistant fillers, delivers strong chemical resistance, corrosion protection, fatigue endurance under cyclic and shock loading, and impact strength — while eliminating the need for external lubrication.
The thin‑wall composite construction combines the structural strength, rigidity, and dimensional stability of stainless steel with the low coefficient of friction and advanced tribological performance of reinforced PTFE. This optimized material system enables reliable operation under dry‑running and boundary lubrication conditions, making it well suited for maintenance‑free industrial applications.
In Double Offset Butterfly Valves (DOBFV), bearing performance directly influences: Operating Torque · Shaft Alignment · Seat Integrity · Service Life · Maintenance Intervals. VIIPLUS SOLUTIONS® Stainless Steel PTFE Composite Bearings are engineered to support both upper and lower valve shaft positions, providing stable shaft guidance while minimizing friction and wear throughout repeated opening and closing cycles.
316 Stainless Steel + PTFE/Glass Fiber Composite Bearing System
Optimal balance between Load Capacity · Corrosion Resistance · Self‑Lubrication · Long‑Term Reliability. By reducing friction, eliminating lubrication requirements, and extending service life, VIIPLUS SOLUTIONS® bearing systems help improve valve reliability while lowering total lifecycle operating costs.
VIIPLUS PTFE Glass Fiber Composite Bearing Material is a metal‑backed composite bearing material designed for low‑speed, high‑load, and oscillating sliding applications. It is commonly applied in industrial valves, offshore equipment, oil and gas processing systems, hydraulic equipment, pumps, marine engineering, and other machinery where external lubrication is limited or maintenance intervals are extended.
The composite structure combines a PTFE‑based sliding layer, woven glass fiber reinforcement, engineered wear‑resistant fillers, a high‑strength bonding resin, and a metallic backing. This multilayer construction provides stable friction characteristics, wear resistance, mechanical support, and dimensional stability under demanding operating conditions.
| Layer | Material | Function |
|---|---|---|
| Sliding Layer | PTFE + Woven Glass Fiber + Wear‑Resistant Fillers | Low friction, dry‑running, wear resistance, chemical resistance |
| Bonding Layer | Thermosetting Resin | Bonds composite liner to metallic backing; maintains structural integrity |
| Backing Layer | Stainless Steel (304/316) or Carbon Steel | Mechanical strength, rigidity, dimensional stability, load support |
The resulting construction is a metal‑backed PTFE glass fiber composite bearing material, rather than a solid PTFE bearing.
| Feature | VIIPLUS PTFE Glass Fiber Composite | Conventional Metal‑Polymer Bearing |
|---|---|---|
| Sliding Layer | PTFE + Woven Glass Fiber Composite | PTFE + Sintered Bronze |
| Backing Material | Stainless Steel or Carbon Steel | Low Carbon Steel |
| Load Capability | Suitable for heavy‑load applications | Suitable for general industrial |
| Impact Resistance | Reinforced composite structure | Standard construction |
| Corrosion Resistance | Depends on backing selection | Depends on backing selection |
| Typical Applications | Valves, offshore, hydraulic, oscillating | General rotary sliding |
Conventional metal‑polymer bearings are widely used for rotary motion in general industrial equipment, while PTFE glass fiber composite bearing materials are commonly selected for oscillating motion, pivoting movement, or extended maintenance intervals.
In double offset butterfly valves and similar valve assemblies, composite bearing materials may be used for: