High-Performance Non-Lubricated Sleeved Plug Valve

Qisheng Non-Lubricated Sleeved Plug Valve

The Qisheng Non-Lubricated Sleeved Plug Valve is specifically engineered for long-term reliability in services where lubricants would contaminate the process or fail due to high chemical activity. By incorporating a heavy-duty PTFE or F4 sleeve between the plug and the body, this valve achieves a permanent, low-friction seal that never requires grease. Its bi-directional shut-off capability and self-cleaning mechanism make it the premier choice for chemical processing, pulp and paper, and various industrial utility systems.

Key Product Advantages

• Maintenance-Free Operation: The sleeved design eliminates the need for periodic lubricant injection, reducing downtime and operational costs in complex systems.
• 360-Degree Sealing: The sleeve provides a complete circumferential seal around the plug, ensuring bubble-tight shut-off in both flow directions.
• Top-Entry Maintenance: Designed for convenience, the top-entry bonnet allows for internal inspection and sleeve adjustment without removing the valve body from the pipeline.
• Self-Cleaning Action: As the plug rotates, the edge of the plug port wipes the surface of the sleeve, removing any accumulated solids or scaling, which is ideal for slurry services.
• Cavity-Free Design: Unlike ball valves, there are no cavities in the body where process media can be trapped, preventing contamination and ensuring safe operation with reactive chemicals.

Typical Applications

Qisheng Non-Lubricated Plug Valves excel in handling challenging media across multiple industries:

• Chemical & Petrochemical: Handling of acids, alkalis, and solvents where zero-leakage and chemical resistance are mandatory.
• Mining & Slurry: Reliable isolation for tailing lines and abrasive mineral processing.
• Pulp & Paper: Managing fibrous media and black liquor with self-cleaning performance.
• Water & Waste Treatment: Durable isolation for sludge and grit-laden fluids.

Technical Specifications

• Design Standards: API 599, ASME B16.34
• Face-to-Face Dimensions: ASME B16.10 / API 6D
• Pressure Ratings: ASME Class 150, 300, 600
• Size Range: NPS 1/2″ to NPS 24″
• Sleeve Materials: PTFE, RPTFE, PFA, F46

Material Configuration