It is a quarter-turn rotary valve that does not require lubrication for operation. It uses a self-lubricating polymer sleeve, elastomeric seals, or a lined interior to provide smooth movement and a tight shutoff.
Non-Lubricated Plug Valve
A Non-Lubricated Plug Valve is a quarter-turn rotary valve designed for on-off and throttling applications without the need for lubrication. Unlike lubricated plug valves, these valves use a self-lubricating polymer sleeve, elastomeric seals, or metal-to-metal contact for smooth operation. They are preferred for applications requiring minimal maintenance, contamination-free performance, and extended service life.
Types of Non Lubricated Plug Valves
- Sleeved Plug Valve – Features a PTFE or polymer sleeve to reduce friction and provide bubble-tight sealing.
- Lined Plug Valve – Utilizes a corrosion-resistant lining (PTFE, PFA, or FEP) for handling aggressive chemicals.
- Eccentric Plug Valve – Designed with an offset plug for improved sealing and lower torque operation.
- Expanding Plug Valve – Uses a mechanical expansion mechanism to create a tight, bubble-free seal.
Advantages and Disadvantages
Advantages
✔ Maintenance-Free Design – No need for periodic lubrication, reducing operational costs.
✔ Zero Contamination Risk – Ideal for applications in food, pharmaceuticals, and chemicals.
✔ Superior Corrosion Resistance – Lined and sleeved variants withstand aggressive media.
✔ Lower Torque Requirements – Operates smoothly without excessive force.
✔ Reliable Bubble-Tight Shutoff – Provides excellent sealing performance.
Disadvantages
✖ Limited Pressure and Temperature Ratings – Typically lower than lubricated plug valves.
✖ Not Ideal for High-Torque Applications – Sleeved designs may not handle extreme pressures.
✖ Sleeve or Liner Wear Over Time – Requires periodic replacement in high-cycle applications.
Specifications | Features |
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Type : Non-Lubricated Plug Valve End Connection: Flanged, Threaded (BSP/NPT), Socket Weld, Butt Weld Size: ½” to 24” Pressure Rating: ANSI Class 150, 300, 600 Temperature Range: -50°C to 250°C MOC (Material of Construction): Carbon Steel (WCB, LCB), Stainless Steel (CF8, CF8M), Duplex, Super Duplex, PTFE/PFA Lined Design Standard: API 6D, API 599, ASME B16.34, BS 5353 Cycle Life: High cycle life with minimal wear Face to Face: As per ASME B16.10 and API 6D Operation: Manual (Lever/Gear), Pneumatic Actuator, Electric Actuator Fire Safe Design: API 607 / API 6FA Compliant (for metal-seated variants) Testing: Hydrostatic and Pneumatic Testing as per API 598 / API 6D Documents: Material Test Certificate (MTC), Pressure Test Report, Fire Safe Test Report, PMI Report, IBR & Third-Party Inspection Certificate
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FAQ’s
Have a question before you buy our products? Take a look at the FAQs below.
If you don’t find the answer you’re looking for, get in touch with us here.
- What is a Non-Lubricated Plug Valve?
- How does these Plug Valve work?
The valve has a tapered or cylindrical plug with a flow passage. When rotated 90 degrees, the passage aligns with the pipeline for flow or blocks it to stop flow. The self-lubricating design ensures low friction and smooth operation.
- What are the benefits of using these Plug Valve?
✔ Maintenance-Free – No need for periodic lubrication.
✔ Leak-Tight Sealing – Provides excellent shutoff performance.
✔ Corrosion Resistance – Lined and sleeved options handle aggressive fluids.
✔ Compact and Lightweight – Easy to install and operate.
✔ Ideal for Clean Environments – Used in food, pharmaceuticals, and chemicals. - What materials are used for these Plug Valves?
Common materials include carbon steel (WCB, LCB), stainless steel (CF8, CF8M), duplex steel, and PTFE/PFA/FEP lining for enhanced chemical resistance.
- How does a Non-Lubricated Plug Valve compare to a Lubricated Plug Valve?
- Non-Lubricated Plug Valve – Maintenance-free, suitable for clean environments, and corrosion-resistant.
- Lubricated Plug Valve – Requires periodic lubrication but handles higher pressure and temperature applications.
- Can these Plug Valve be automated?
Yes, these valves can be fitted with pneumatic, electric, or hydraulic actuators for remote and automated operation.
- How are these plug valves tested for quality?
Testing is performed as per API 598 and API 6D, including hydrostatic, pneumatic, and fire-safe testing, to ensure performance and reliability.
- Are these Plug valves suitable for high-pressure applications?
They are generally recommended for low to medium-pressure applications. For high-pressure systems, lubricated plug valves may be preferred.
Industries where Non-Lubricated Plug Valve is Used
Pharmaceutical Industry
Wastewater Treatment
Food and Beverage
Oil and Refinery
Power Generation
Application
- Chemical Processing – Suitable for handling corrosive and aggressive fluids.
- Pharmaceutical Industry – Ideal for contamination-free fluid control.
- Water and Wastewater Treatment – Used in flow regulation and isolation.
- Food and Beverage Industry – Meets hygiene and safety standards.
- Oil & Gas Sector – Deployed in low-pressure gas distribution.
- Power Plants – Controls steam and cooling water systems.
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