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The most popular style of valve in the world of flow control is the gate valve. They are the on/off switches of the fluid control industry and they are found in every refinery, chemical plant, power plant and industrial facility. Gate valves exist for one primary purpose- to stop flow. Because of this, they are often referred to as “stop” or “block” valves. 

From the outside, most gate valves look somewhat similar. However, inside there are a host of different design possibilities. Most gate valves consist of a body and bonnet that contains a closure element, called a disc or a gate. The closure element is attached to a stem that passes through the bonnet of the valve, ultimately interfacing with a hand wheel or other device to operate the stem. Pressure around the stem is contained through the use of packing material which is compressed into a packing area or chamber.

For more information:http://www.didlink-valve.com