Overview of the Safe Use of Instrument Valves

Release date:

2021-02-22

Switching instrument valves are something we encounter every day in our daily lives. However, people who do not understand such a small instrument valve may operate it dangerously in order to improve their knowledge of using instrument valves. Therefore, many details must be paid attention to in daily life.

First, according to the type of instrument valve,

"Gate instrument valves are used to cut off the medium. When fully open, the entire flow path is straight through. At this time, the pressure loss of the medium flow is minimal. Gate instrument valves are usually suitable for conditions where frequent switching is not required and the gate is kept fully open or fully closed. They are not suitable for regulation or throttling. For high-speed flowing media, partial opening of the gate may cause gate vibration, which can damage the sealing surface of the gate and the instrument valve seat, and throttling will cause the gate to be eroded by the medium. From the structural form, the main difference lies in the form of the sealing element. According to the form of the sealing element, gate instrument valves are usually divided into several different types, such as wedge gate instrument valves, parallel gate instrument valves, parallel double gate instrument valves, wedge double gate instrument valves, etc. The most commonly used forms are wedge gate instrument valves and parallel gate instrument valves."

The stem axis of the globe instrument valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short and has a very reliable cutting action, making the instrument valve very suitable for cutting off or regulating throttling media. Once the globe instrument valve disc is opened, there is no contact between the sealing surfaces of the valve seat and the valve disc, providing a very reliable cutting action, so this type of instrument valve is very suitable for cutting off or regulating throttling media.

Once the globe instrument valve is in the open state, there is no contact between the sealing surfaces of the valve seat and the valve disc, so the mechanical wear of the sealing surfaces is very small. Since the valve seat and valve disc of most globe instrument valves are easy to maintain or replace the sealing elements, it is not necessary to remove the entire instrument valve from the pipeline, making it very suitable for situations where the instrument valve and pipeline are welded together. The flow direction changes when the medium passes through this instrument valve, so the flow resistance of the globe instrument valve is higher than that of other instrument valves.

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