Plug Valve
Plug Valve uses a cylindrical or tapered plug with a passage to control flow with a quick quarter-turn motion. Available in lubricated, non-lubricated, sleeved, eccentric, and full port designs, it provides reliable tight shut-off and low pressure drop for isolation and flow control across water, sewage, slurry, oil & gas, chemical, and industrial process services.
Introduction
A plug valve is a quarter-turn isolation valve that uses a cylindrical or tapered plug with a passage to start, stop, or regulate flow. It offers tight shut-off, low pressure drop, and simple operation across a wide range of services.
Key Features
- Quarter-turn operation for quick and positive shut-off.
- Lubricated, non-lubricated, sleeved, and eccentric plug designs.
- Full port configuration available.
- Stainless Steel, Carbon Steel, or Alloy Steel plug.
- PTFE, elastomer, metal, or rubber seat / lining.
- Full port or reduced port configuration.
- Bi-directional flow depending on design.
- Designed to API 599 / API 6D / ASME B16.34 standards.
Technical Specifications
| Design Feature | Standard Parameters / Range Options |
|---|---|
| Nominal Size Range | DN 15 mm to DN 900 mm |
| Manufacturing Standards | API 599, API 6D, ASME B16.34 |
| Material of Construction (MOC) |
|
| Pressure Ratings | PN 10 / PN 16 / PN 25 / PN 40 / Class 150# / Class 300# / Class 600# / Class 900# / Class 1500# / Class 2500# |
| Modes of Operation | Lever, Handwheel, Gear, Pneumatic, Electric, Hydraulic |
| End Connections | Flanged / Threaded / Butt Weld / Socket Weld |
| Application Media | Water / Sewage / Slurry / Oil & Gas / Chemical / Industrial Process |
Application & Usage of Plug Valve
Water & Wastewater
Provides reliable isolation and flow control in potable water, sewage, and treatment plant piping.
Oil & Gas
Used for block-and-bleed and isolation duties in pipelines, manifolds, and wellhead services where tight shut-off is required.
Chemical Process
Handles corrosive and aggressive media with suitable body, plug, and seat materials, ensuring safe isolation.
Slurry Service
Full-port designs handle abrasive slurries with minimal clogging and erosion in mining and process plants.
Industrial Gases
Provides dependable quarter-turn isolation for air, inert gas, and fuel gas distribution systems.
Types of Plug Valves
Lubricated Plug Valve
Injects a sealant between plug and body to reduce friction and improve sealing, suited to high-pressure services.
Non-Lubricated Plug Valve
Uses a tapered plug, sleeve, or metal-to-metal seating without sealant, reducing maintenance and fugitive emissions.
Sleeved Plug Valve
A PTFE or elastomer sleeve covers the plug to provide bubble-tight shut-off and corrosion resistance.
Eccentric Plug Valve
Offset plug and shaft design minimizes seat wear and operating torque, ideal for throttling and abrasive media.
Certificates & Inspection
All valves are subjected to rigorous hydrostatic shell and seat pressure testing in accordance with standard codes (e.g., API 598 / IS 14846) prior to delivery.
- Physical dimension and wall-thickness checks
- Hydrostatic seat and shell test validation
- Manufacturer Test Certificate (MTC) and third-party inspection (SGS, TUV, RINA, IRS etc.) available
- Epoxy powder coating inspection (DFT test)
Quality Assurance
GM Dalui & Sons Pvt. Ltd. is an ISO 9001:2015 certified manufacturer. Our commitment to safety, reliable sealing, and long service life is backed by rigorous material inspection, ultrasonic wall thickness checks, and design calculations.
We customize flow control systems to meet specific requirements for municipal waterworks, agricultural pumping wells, chemical distribution loops, and thermal power plant grids.