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Plug Valve Body

Plug Valve Body

Plug valves utilize conical and cylindrical plugs to stop or throttle flow in a system. The plug has an opening in the center that allows for flow through the valve in the open position when the cavity is parallel to the flow. When the controlling lever rotates, the plug inside the valve assembly turns and the cavity is perpendicular to the flow which in turn stops the flow.

Plug valve construction allows for quarter turns to completely shut off or open flow. This article covers the different types of plug valves, valve construction and components, typical applications, and maintenance and repair.


  • Commercial and light industrial applications.
  • Including directional flow control
  • Handling of gas or liquid fuels
  • Regulating fluids with suspended solids
  • Low-temperature services
  • Plug valve design
  • Advantages and Disadvantages
  • Features

General Info

The typical plug valve design has several key parts that work together to create a robust and reliable valve suitable for various industrial applications. Depending on the specific application, the plug valve may have additional features, such as seals and gaskets, to improve leak resistance.

  • Body: A plug valve's body is usually cylindrical or globular and made of durable material such as cast iron, stainless steel, or alloy steel.
  • Plug: The plug opens or closes the flow path. It is typically cylindrical or tapered and features a hole, or port, through its center.
  • Stem: The stem connects the plug to the actuator.
  • Bonnet: The bonnet covers the valve body and provides a leak-proof closure at the top.
  • Actuator: The actuator rotates the stem, which rotates the plug. Plug valve actuators can be manual (handle), electric, pneumatic, or hydraulic.

Advantages and Disadvantages

Besides being compact and using up less space, gas plug valves offer the following advantages:

  • Flow Regulation – Tight shut-off, quick opening and low-pressure drop.
  • Fire-safety and Durability – Reduced likelihood of corrosion or erosion as the actual plug and body seating surface do not get exposed to the line fluid.
  • Versatility – You can use plug valves with large flow rates as well.

A few disadvantages of plug valves are:

  • They are not suitable for throttling applications.
  • They require greater force for actuation due to high friction.
  • They present the possibility of galling.
  • The tapered plug design basically leads to a reduced port.


  • Plug valve is an auxiliary valve used in opening and throttling of high pressurized systems. It is used as by-pass to the line valve; it balances the pressure and provides the safe opening of line valve.
  • Plug valves have a conical or cylindrical obturator rotating around the axis perpendicular to the flow direction.
  • Plug valves for high pressure and/or high temperature services. It is important to make the material selection according to the fluid corrosion.
  • Valve body and stem can finish emergency injection seal, through the grease injection valve, the stop leak com pound can achieve short-time seal, theref or to buy time handling the scene.
  • Full teflon PTFE lined plug valve can be used in the whole pressure range to avoid leakage and shut off more convenient to the line system and pipeline maintenance.