What is a gate valve? How does it function?

What is a gate valve? How does it function?

A gate valve is used to control the flow of the liquid and control it through the pipelines. The gate valves have a bonnet, body, stem, and seat ring. The internal valve has a wedge-shaped gate whose movement decides the flow of the liquid through the valve. The movement of the wedge is at 90 degrees to the flow of the liquid through the pipelines. The volume of the flow of the liquid through the gate valve increases as the gate of the valve operates.

What is a gate valve? How does it function?

Just a word of caution to operate the gate valves in either full-on or full-off mode. If the gate valves are operated in partial modes, it will lead to wear and tear of the disc as well as create unwarranted noise during the operation.

Working of Gate Valves:

The operation of the valve depends on whether the gate valve is a rising stem or a fixed stem. If the gate valve is rising stem, during the closed condition, the stem doesn’t rise, if the fluid doesn’t flow. When the fluid flows, the steam rises, which indicates fluid movement. In the non-rising stem, the valves have extra space within the stem, where the movement of the valve takes place upon the flow of the gas. There is a screw that is present within the valve, which comes into the picture as the gas flows through. Finding its application in places with space constraints, the non-rising stem gate valves are used in places where the pipes are present within the ground.

Advantage of Gate valve:

The loss in the flow of the liquid is due to friction while the movement of the liquid is very less in gate valves.

The gate valves provide a laminar flow of the liquid in the valve, thus keeping the liquid pressure evenly distributed within the valve.

The drop in the pressure of the fluid that flows through the gate valve is low compared to other valves.

Disadvantages of the gate valve:

Slow in operation; the gate valves work mostly on the pressure of the fluid through the valve. Hence the valves don’t open and close quickly.

Loss in energy due to a lot of screws present in the case of the non-rising valve.

The disc and the seat rings in case of the valve need to be very clean such that they don’t react with the chemicals flowing through the pipeline.

Camtech Manufacturing is the top leading API accredited valve manufacturing company in the UAE, the Middle East, and North Africa region providing unparalleled quality with sheer excellence.

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