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Gate Valve}

  • Posted on December 11, 2017 at 2:16 am

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Gate Valve

by

Varalakshmi

A gate valve

, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. 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.

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A gate valve

is a type of stopper placed on a pipe system to block flow. These valves simply prevent the passage of liquid using a wedge that slides in and out of the pipe. In most cases, the gate valve is designed to be completely opened or completely closed. As a result, these valves are rarely used as a means of flow control; they generally just stop flow completely or are unused. Partially closed gate valves may increase pressure in a system in unpredictable ways or cause vibration in the liquid.

The construction of a gate valve

is quite simple. They generally have two threaded connectors that hook into the pipe system. It is possible for a gate connector to have more than two connections, but this is very rare. A post, called a bonnet, rises above the connectors; this area holds the stopping wedge and the mechanism for raising and lowering it. Lastly, a handle, which controls the rising and lowering of the stopper, sits on top of the bonnet.

When the handle is turned, it moves the stopper inside the valve. The stopper slides down into the pipe and blocks liquid from passing. The valve will typically indicate the position of the stopper on the outside of the valve, or the handle will screw in and out to show the relative height of the stopper. The valve casing is slightly wider than the connected pipes, allowing the stopper to totally cover the opening and make it completely liquid-tight.

The method used to connect the bonnet to the valve has an impact on the use of the gate valve

. If the bonnet is simply screwed on, the valve will work well for light-duty applications. Bolted bonnets work well for heavy-duty jobs, but cannot be taken apart for repair or cleaning. Union-bond bonnets may be taken apart easily, but they also have the highest rate of leaking. The last style is a pressure-sealed bonnet, it works well in many different environments, but it is also the most expensive style.

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