Plug Valve

Plug valve manufacturers in USA 

SVR Global manufactures plug valves in the US lubricated and non-lubricated, concentric and eccentric, in rectangular, round, and venturi port patterns built to API 599 and MSS SP-78, with hydrostatic testing per API 598 and full material traceability. Supplying water and wastewater, oil and gas, chemical processing, and mining applications across the US and international markets. 

What Is a Plug Valve?

A plug valve is a quarter-turn valve that consists of a cylindrical or conical plug having a bore drilled through it for controlling the flow of fluids. The operation of turning the plug by 90° causes the bore of the plug to align with or close off the flow path. In contrast to the ball valve, where the seal is achieved by a spherical plug on the seating surface, the plug valve has a seal along the entire surface of the plug with respect to the valve body.

Types of Plug Valve:

• Eccentric Plug Valve

• Jacketed Plug Valve

• Lubricated Plug Valve

• Non Lubricated Plug Valve

• Sleeved Plug Valve

Plug Valve Port Patterns:

Port pattern determines flow area, pressure drop, and how well the valve handles solids or slurry.

Lubricated Plug Valves

• Sealant injected between plug and body to maintain the seal and lower operating torque

• Lubricant replenished in line, without removing the valve

• Extends seat life over time

• Specified where lower torque and long-term seat performance matter more than maintenance simplicity

Non-Lubricated Plug Valves

• Uses a resilient sleeve or coating (commonly PTFE) instead of injected lubricant

• Requires less routine maintenance

• Seat wears faster under dust, dirt, or particulate laden service

• Preferred where periodic lubrication isn't practical, or the sleeve material handles the process media on its own

Plug Valve Sleeve and Liner Materials:

• PTFE Sleeve: The body is fitted with a liner made of PTFE, which offers resistance to friction and chemicals, as well as no need for lubrication.

• Rubber Lined: Rubber lining is used in the body, plug, and face of the flanges, which offer abrasion resistance in services involving abrasive slurries where a metal to metal seal fails easily.

• Metal Seat (Welded Overlay): Metal seat is used where a PTFE sleeve is not recommended due to temperature and pressure requirements.

Torque and Actuation Requirements:

Plug valves generally require more operating torque than a ball valve of the same size, because the plug seals against the body across a larger surface area rather than a single spherical contact point. This has practical consequences for the buyer:

• Actuators must be sized to the valve's actual torque curve, not assumed from a similarly sized ball valve

• Eccentric plug designs reduce torque substantially compared to concentric designs, which affects actuator selection and cost

• High cycle applications should factor torque into seat and sleeve life expectations, since higher torque accelerates wear on non lubricated designs in particular

Standards and Certifications:

• API 599 - covers steel and stainless steel plug valves, including design, materials, and testing requirements for flanged, welded, and threaded end valves.

• MSS SP-78 - covers cast iron plug valves, specifying dimensions, materials, and pressure-temperature ratings for that valve class.

• API 6D - pipeline valve standard, relevant where plug valves are used in transmission pipeline service rather than plant piping.

• AWWA C517 - governs eccentric plug valves used in waterworks service, an important standard for water and wastewater applications specifically.

Testing and Quality Control:

• Hydrostatic testing: every valve pressure tested per API 598 to confirm body and seat integrity before shipment.

• Material Test Reports (MTRs): heat traceable chemical and mechanical documentation tied to the specific material lot used in that valve ask whether this is provided standard or billed separately.

• Third party inspection: independent verification of dimensional, material, and pressure-test compliance, typically required for larger orders or applications with audit requirements.

Plug valve Industries and Applications:

• Water and wastewater - eccentric plug valves for sludge, slurry, and solids laden flow

• Oil and gas - upstream and midstream isolation and diverting service

• Chemical and petrochemical - corrosive and abrasive media handled with sleeved or lined plug valves

• Pulp and paper - slurry and stock handling

• Mining - abrasive slurry isolation

• Power generation - plant piping isolation service