Common knowledge of shut-off valves

Category:Technical Article  Date:2024-06-15

The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The valve stem has a relatively short opening or closing stroke and a very reliable cutting action, making it very suitable for cutting, adjusting, and throttling the medium. Once the disc of a globe valve is in an open position, there is no longer any contact between its seat and the sealing surface of the disc, and it has a very reliable cutting action. This type of valve is very suitable for cutting, adjusting, and throttling the medium.


Once the globe valve is in the open state, there is no longer contact between its seat and the sealing surface of the valve disc, so its sealing surface has less mechanical wear. As the seat and valve disc of most globe valves are relatively easy to repair or replace sealing components, the entire valve does not need to be removed from the pipeline. This is very suitable for situations where the valve and pipeline are welded together. When the medium passes through this type of valve, the flow direction changes, so the flow resistance of the shut-off valve is higher than that of other valves.


There are several commonly used globe valves:

1) Angle globe valve; In angle globe valves, the fluid only needs to change direction once, resulting in a smaller pressure drop through this valve compared to conventional globe valves.


2) Direct current shut-off valve; In DC or Y-shaped globe valves, the flow path of the valve body is inclined with the main flow path, so the degree of damage to the flow state is smaller than that of conventional globe valves, and therefore the pressure loss through the valve is correspondingly smaller.


3) Plunger type globe valve: This form of globe valve is a variant of conventional globe valves. In this valve, the disc and seat are usually designed based on the plunger principle. The valve disc is polished into a plunger and connected to the valve stem, and the sealing is achieved by two elastic sealing rings nested on the plunger. Two elastic sealing rings are separated by a sleeve ring, and the sealing ring around the plunger is pressed firmly by the load applied by the valve cover nut on the valve cover. The elastic sealing ring can be replaced and can be made of various materials. This valve is mainly used for "opening" or "closing", but it is equipped with a special form of plunger or special sleeve ring, which can also be used to regulate flow.



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