A valve is a device that regulates, directs or controls the flow of a fluid by opening, closing, or partially obstructing various passage ways. Valves have many uses such as controlling water for irrigation, industrial uses for controlling processes as well as residential uses.Plug Valve is also similar and is useful to control the flow through the values. Plugs can be rotated to control the flow. There are plugs in the plug valves. They have one or more hollow passage ways. The fluid can flow through the plug when the valve is open. Plug value is simple and also very economical. In the open position, the plug-passage is in one line with the inlet and outlet ports of the valve body. Plug values are available in various types such as 3-Way, 4-Way Plug Valves, Inverted Pressure Balance Lubricated Plug Valve, double block and bleed plug valve, Flange-Connection Lifting Plug Valve, Eccentricity plug valve, Sleeve type soft sealing plug valve, Sleeve type soft sealing plug valve and Orbit plug valve that are general valve.
Plug valve is also called as cock or stop-cock valves or quarter-turn valves. Plug valves are designed in such a way that it has three main parts namely body, cover and the plug. It has a very simple design. The plug is a cylindrical, tapered, or generally cone-shaped device that can be raised or lowered within in order to maintain the flow or also to restrict or completely shut off the flow. The plug is capable of having movements. Actually values usually have functions to stop and start fluid. Thus we can say that it can control the flow. Material options for plug valve include carbon steel and also various grades of stainless steel that includes duplex, titanium, and zirconium.In order to meet the needs of corrosive and abrasive liquids, plug valves can be designed from materials that resist corrosion. For consistent and accurate flow control of liquids, plug valves are an ideal and proven as a best choice.
Ball valves are one of the most versatile valves found throughout industrial applications. Ball valves are very durable and are reliable too. Ball valve and plug valve are generally called "quarter turn" valves because they need their handle turned only 90 degrees to change on/off positions. This does not hold true for three- and four-way valves. Plug valves are similar to Ball valves in operation.
Ball valves are also designed to be operated fully open or fully closed with any kind of liquid containing particles that could scratch the ball. Ball valves have low pressure drops and are able to open and close quickly. They are simple and are trouble free. Today ball valves have grown in popularity. However, plug valves are available in much larger sizes than ball valves. Usually a plug valve uses a cylindrical kind of element to shut down the flow whereas ball valve uses a spherical element.
A plug valve has an unobstructed flow, yet requires only a 90 degree turn to open it. Stem corrosion is minimal because there are no screw threads. Almost all plug valves now are coated plug and are seal off tight. Plug value has many advantages and applications. Plug values have quick quarter turn on-off operation, minimal resistance to flow and smaller in size than most other valves.
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