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How Does a Gate Valve Work?

The author:admin Release time:2020-09-24 browse:
The working mechanism for the gate valve is quite simple. While the gate valve may have a number of classifications and designs, how it works remains the same across all designs.

To close the valve, you should rotate the handwheel clockwise. This will move the gate and the stem downwards towards the seat at the lower bottom of the valve. This is the complete closure of the gate valve. The media is blocked in the upstream inlet so no leakage happens. No excessive pressure should be applied when closing the valve to prevent the stem from breaking

To open the valve, you should rotate the valve in counter-clockwise order. Do this without applying too much pressure because it can damage the disc and stem, and leak. If there is pressure, stop turning.

What you should do when there is pressure while turning the valve is to loosen up the packing nut that is located on top of the gate valve body. Loosen it one turn but make sure that this should be tightened after the gate valve is fully open.

The stem and the disc move upwards to allow the passage of the media. A fully opened gate valve does not offer resistance so there is a very minimal pressure drop.

For throttling, you can use the gate valve in a semi-open position. Take note, though, the pressure of the media can damage the disc. There is a great chance of a backflow because of the semi-opened position. It is the backflow of the media that causes more friction, hence the damage. Additionally, operations that use a partially open gate valve dislodges the disc from its position, reducing its efficiency and precision.
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