Lubricated Plug Valve
Metal-seated plug valve with lubricant injection for gas and slurry applications.
Technical Specifications
| Type | Lubricated (Pressure Balance) |
| Size Range | 1/2" to 12" (15 mm to 300 mm) |
| Body Materials | CI, Carbon Steel, Stainless Steel |
| Plug Material | Carbon Steel, Stainless Steel (Hard-faced) |
| End Connections | Flanged, Screwed |
| Pressure Rating | PN16, Class 150 / 300 |
| Standards | API 599, MSS SP-78 |
Applications
Gas distribution, slurry, corrosive and abrasive services
About the Lubricated Plug Valve
The lubricated plug valve is a quarter-turn valve in which a tapered or cylindrical plug rotates within a precision-bored body cavity, with a liquid or semi-solid sealant injected between the plug face and the body bore to provide sealing and reduce operating torque. The sealant (a proprietary grease or oil compound matched to the process fluid) fills the microscopic surface imperfections between plug and body, creating a pressure-tight seal without needing precisely machined surfaces. A check-valve-equipped lubricant injection fitting on the plug stem allows field injection of additional sealant without depressurising the valve - restoring sealing if the original sealant is washed out or degraded.
Lubricated plug valves are particularly valued in gas distribution, where the metal-to-metal design provides inherent fire safety with no elastomer components to burn, and where the ability to re-lubricate in service dramatically extends valve service life. The pressure-balanced design incorporates a relief groove around the plug that equalises pressure between the upstream and cavity, preventing the plug from being hydraulically locked into the body under high differential pressure. Vajra Industrial Solutions supplies lubricated plug valves in sizes 1/2" to 12" in Cast Iron, Carbon Steel, and Stainless Steel to API 599 and MSS SP-78.
Where It's Used
Key industries and applications for the Lubricated Plug Valve
Gas distribution networks
Cast Iron or Carbon Steel lubricated plug valves for natural gas town border stations, district regulator inlets, and service connection isolation; field re-lubrication extends service interval to 10+ years without valve removal
Oil field wellhead and gathering
Carbon Steel lubricated plug valves on wellhead Christmas tree connections, production manifold isolation, and test headers; H2S-resistant sealant compounds available for sour gas service
Slurry and abrasive media
SS316 hard-faced lubricated plug valves for abrasive slurry lines in mining, cement, and mineral processing; sealant injection keeps abrasive particles from embedding in the seating surfaces
Corrosive chemical service
SS316 lubricated plug valves with chemically compatible sealant for moderately corrosive acids and alkalis where PTFE-sleeved designs cannot withstand the temperature or concentration; sealant barrier prevents body corrosion
Pipeline pigs and maintenance
large-bore Class 150–300 Carbon Steel lubricated plug valves at pipeline pigging trap connections; full-bore conduit plug allows pig passage; sealant re-injection maintains seal integrity during infrequent cycling
How to Choose the Right Lubricated Plug Valve
Choose lubricated plug valves for: (a) gas distribution where the ability to inject sealant in service without shutdown is a maintenance advantage; (b) abrasive slurry or solids-laden fluids where metal-to-metal seating with sealant protection outperforms elastomer designs; (c) bi-directional service where metal-to-metal seating provides reliable shut-off in both directions. Specify the sealant compound to be compatible with the process fluid - ask the manufacturer for a sealant compatibility matrix. For clean chemical service without abrasives, a PTFE-sleeved plug valve is maintenance-free.
Popular Configurations
Most commonly ordered specifications for the Lubricated Plug Valve
Frequently Asked Questions
About Lubricated Plug Valve - ordering, specs, delivery & compliance
What standards does the Lubricated Plug Valve comply with?+
Our Lubricated Plug Valve complies with API 599, MSS SP-78. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Lubricated Plug Valve?+
The Lubricated Plug Valve is available in CI, Carbon Steel, Stainless Steel. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Lubricated Plug Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Lubricated Plug Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered plug valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Lubricated Plug Valve?+
The Lubricated Plug Valve is available in pressure ratings of PN16, Class 150 / 300. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Lubricated Plug Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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