SS 316 + PTFE (Fabric Tex Woven) Bearing Shaft (Bush) for Butterfly and Ball Valves

Category: Valve Accessories | Bearing Bush | Low-Friction Sliding Bearings | Self-Lubricating Bearings | Heat-Resistant Composite

Product Overview: Strength, Stability & Low Friction

The bearing shaft (bush) is a critical component in butterfly valves, ball valves, and other industrial valves, supporting smooth stem rotation, reducing wear, and ensuring long-term performance. Constructed from SS 316 stainless steel and PTFE reinforced with woven fibers, these self-lubricating bearings combine metallic strength and dimensional stability with low-friction, wear-resistant surfaces.

Designed to handle high loads, frequent cycling, and corrosive environments, this composite bearing minimizes brinelling, fretting, and other forms of surface wear. Its inherent damping properties make it compatible with a wide range of mating materials, supporting both radial bearing and thrust washer applications.

Key Advantages

• High Impact Strength – Withstands shock loads without deformation

• Exceptional Wear Resistance – Ideal for high-cycle operations

• High Load Capacity at Low Speeds – Supports heavy-duty applications

• Dimensional Stability – Maintains precision fit despite temperature changes

• Custom Sizes – Tailored to your valve or industrial machinery requirements

• Maintenance-Free Operation – Eliminates the need for external lubrication

Technical Specifications

Note: Not all sizes or materials are standard. Confirm compatibility for your application with an engineering team.

Typical Construction

• PTFE Matrix Layer – Provides low-friction, self-lubricating surface

• Metal Backing (SS 316) – Ensures strength and dimensional stability

• Sleeve Bearing / Thrust Washer – Supports radial and axial loads

This layered design allows the bearing to maintain performance in high-temperature, corrosive, and chemically aggressive environments, making it suitable for industrial, chemical, food processing, and water treatment systems.

Applications

• Butterfly valves and ball valves

• Commercial fire sprinkler systems

• Mixers, blenders, and industrial agitators

• Swivels and rotary joints

• Extruders and high-load industrial machinery

Application Features

Butterfly Valves

• Upper Bearing: Supports actuator torque and axial loads

• Lower Bearing: Stabilizes stem, prevents deflection, maintains alignment

• Benefits: Low friction (0.02–0.1), corrosion resistance, sealing support, compact design, and blowout-proof construction

Ball Valves

• Installation: Around the stem to rotate the ball for flow control

• Floating Ball Valves: Supports stem under high-pressure media

• Trunnion-Mounted Valves: Complemented by additional bearings for larger sizes

• Benefits: High torque handling, wear resistance, pressure support, and compact design for automation

Common Features

• Self-lubricating for maintenance-free operation

• Durable for 5–10 years under continuous operation

• Wide temperature range (-200°C to 250°C)

• Not ideal for extreme abrasive media – consider alternative composites in slurry-heavy applications

Material Selection and Benefits

The SS 316 + PTFE (Fabric Tex Woven) bearing bush is a layered composite:

1. SS 316 Backing – Provides mechanical strength, corrosion resistance, and temperature stability

2. PTFE + Woven Fiber Layer – Low friction, self-lubricating, wear-resistant, and dimensionally stable

3. Optional Interlayer – Sintered bronze for enhanced load distribution (used in heavy-duty applications)

Benefits:

• Combines corrosion resistance, strength, and low friction

• High load capacity and wear resistance

• Maintenance-free, reducing total lifecycle costs

• Suitable for diverse industrial media and operating conditions

Valve-Specific Considerations

• Butterfly Valves: Lower torque allows thinner PTFE layers; larger diameters need reinforced fabric for high loads

• Ball Valves: Higher torque and pressure demand robust fabric reinforcement; trunnion designs require bushings for combined stem/trunnion loads

• High-Temperature or Fire-Safe Designs: SS 316 ensures stability, while PTFE handles moderate temperatures

Practical Notes

• Dimensions: Customizable to valve DN and stem diameter (ID 10–100 mm, OD 12–110 mm, length 10–50 mm)

• Installation: Press-fit or bonded in the valve body; proper alignment is critical

• Maintenance: Inspect every 2–5 years in aggressive media; replace if PTFE layer wears or steel shows corrosion

• Standards Compliance: Compatible with ISO, API, and EN standards for butterfly and ball valves

Conclusion

The SS 316 + PTFE (Fabric Tex Woven) bearing bush is the optimal choice for butterfly and ball valves requiring:

• Low friction and smooth stem rotation

• Corrosion and wear resistance

• High load capacity

• Maintenance-free operation

Perfect for industrial, chemical, food, and water applications, this composite bearing ensures reliable valve performance and extended service life.

Better Science. Better Service. Better Solutions.

FAQ: Long-Tail Keyword Optimization

Q1: What is a self-lubricating PTFE bearing for butterfly valves?
A: It’s a valve bushing made of PTFE reinforced with woven fibers, installed at the upper and lower ends of the butterfly valve stem. It reduces friction, eliminates grease, and ensures smooth quarter-turn operation under high loads.

Q2: How to select SS 316 + PTFE bearing bushes for ball valves?
A: Consider stem size, valve pressure class, torque, operating temperature, and media type. The SS 316 backing provides strength, while the PTFE woven layer ensures low friction, wear resistance, and self-lubrication for maintenance-free performance.

Q3: What is the temperature range for PTFE + Fabric Tex bearings?
A: These bearings operate between -200°C and +250°C, suitable for cryogenic to moderately high-temperature applications.

Q4: Are these bearings suitable for abrasive media?
A: Standard PTFE + woven fiber bushes are not recommended for highly abrasive media. For slurry-heavy applications, consider ceramic or metal-polymer composites.

Q5: How long is the service life of SS 316 + PTFE bearing bushes?
A: Typically, 5–10 years under continuous operation, depending on load, media, and environmental conditions.

Conclusion

The SS 316 + PTFE (Fabric Tex Woven) bearing shaft is the ideal choice for butterfly and ball valves in industrial, chemical, food, and water applications. Its combination of low friction, corrosion resistance, high load capacity, and maintenance-free design ensures reliable valve operation and extended service life.

Optimize Your Valve Performance with Self-Lubricating SS 316 + PTFE Bearing Bushes Today.