The stem axis of the globe valve is perpendicular to the seat sealing face. The relatively short open or closed stroke of the valve stem and the very reliable blocking action make this valve very suitable for the blocking or adjustment of the medium and the economical application.
Once the disc of the globe valve is in an open state, it will no longer touch between the valve seat and the sealing surface of the valve disc, and has a very reliable blocking action, which is very suitable for the interception or adjustment of the medium and the use of saving.
Once the globe valve is in an open state, there is no longer any touch between its seat and the sealing surface of the disc, so the mechanical wear of its sealing surface is small, because the seat and disc of most globe valves are relatively easy to repair or replace the sealing elements without removing the entire valve from the pipeline, which is very suitable for the occasion when the valve and the pipeline are welded into one. The direction of movement of the medium as it passes through these valves changes, so that the movement resistance of the globe valve is higher than that of other valves.
Commonly used globe valves are as follows:
1) Angle globe valve; In an angle globe valve, the fluid only needs to be redirected once, resulting in a smaller pressure drop through the valve than a conventional globe valve.
2) DC globe valve; In a DC or Y-shaped globe valve, the flow channel of the valve body is diagonally aligned with the main flow channel, so that the degree of damage to the active condition is less than that of the conventional globe valve, so that the pressure loss through the valve is correspondingly smaller.
3) Piston globe valve: The globe valve of this method is a variant of the conventional globe valve. In this valve, the disc and seat are usually planned based on the plunger principle. The disc is polished into a plunger connected to the stem, and the sealing is done by two elastic seals that are sleeved over the plunger. The two elastomeric seals are separated by a collar and pressed against the seals around the plunger by a load applied to the bonnet by the bonnet nut. Replaceable seals and can be made of a variety of materials, the valve is mainly used for "on" or "off", but it is also available with a special plunger or special collar for volume savings.
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