A gate valve can be defined as a type of valve that used a gate or wedge type disk and the disk moves perpendicular to flow to start or stop the fluid flow in piping.
Wedge gate valve parts.
They re designed to meet or exceed awwa standards and have for decades been recognized as the original and definitive standard.
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Gate valves work by inserting a rectangular gate or wedge into the path of a flowing fluid.
They are operated by a threaded stem which connects the actuator generally a hand wheel or motor to the stem of the gate.
A gate valve is the most common type of valve used in any process plant.
The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar so gate valves are often used when a straight line flow of fluid and minimum restriction is desired.
If the valve has a rising stem its position can be seen just by looking at the position of the stem.