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Plug Valve

Plug valves have a cylindrical or conical shape plug which can be rotated 90°. In cylindrical valve plugs, the passageway is generally rectangular; while the conical valve plugs, the passageway is trapezoidal. These shapes make the structure of the plug valve lighter, but at the same time it also produces a certain flow loss. The plug valve is most suitable as a cut-off and connection medium and bypass. But depending on the nature of the application and the erosion resistance of the sealing surface, it can sometimes be used for throttling.Get more news about pressure balance plug valve,you can vist our website!

1. Definition of Plug Valve

Plug valve is a quick-opening straight-through valve. Because the movement between the sealing surfaces has a wiping effect, and it can completely prevent contact with the flowing medium when it is fully opened, it can also be used for medium with floating particles. Another important feature of the plug valve is that it can be designed to multi-port pipeline, one valve can design to two, three, or even four ports. This will simplify the design of the piping system, reduce the amount of valves and some connection accessories required in the piping system.

2. Plug Valve Working Principles

Use a plug with a through hole as a component for the opening and closing. The plug rotates with the valve stem to achieve opening and closing actions. The plug of the plug valve is mostly a cone (also a cylinder), which combinations with the cone hole surface of the valve body to form sealing. The plug valve is the earliest used valve, with simple structure, fast switching and low fluid resistance. Ordinary plug valves are sealed by direct contact between the machined metal plug and the valve body, so the sealing is poor, the opening and closing force is large, and it is easy to wear.

3. Plug Valve Types

Based on application, type of plug valves includes Soft seal plug valve, oil lubricated hard seal plug valve, lift plug valve, 3 way plug valve and 4 way plug valve

A. Soft Seal Plug Valve
Soft-sealed plug valves are often used in harsh environments such as corrosive, highly toxic and high-hazardous medium, where leakage is strictly prohibited, and where the valve material does not contaminate the medium. The valve body can be built from carbon steel, alloy steel and stainless steel according to the working medium.