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Globe Valve
- Aug 29, 2018 -

The stem axis of the globe valve is perpendicular to the seat sealing surface.The stem has a relatively short opening or closing stroke and a very reliable shut-off action, making the valve very suitable for cutting or regulating as a medium and throttling.Once the disc of the globe valve is in open position, there is no contact between its seat and the disc sealing face, and with very reliable shutoff action, the valve fits well as a medium cut-off or adjustment and throttling service.

Once stop valve is fully open, it will no longer have a contact between the seat and clapper sealing surfaces, and thus its sealing surface mechanical wear and tear is small, because most of the cut-off valve seat and valve disc is easy to repair or replace the whole valve sealing components without removed from the pipeline, for the valve and pipeline welding into one occasion is very applicable.Flow direction changes when medium passes through such valves, so the flow resistance of the globe valve is higher than that of other valves.

The commonly used globe valves are as follows: 1) Angle globe valves;In the Angle globe valve, the fluid only needs to change direction once, so that the pressure drop through the valve is smaller than the normal structure of the globe valve.2) straight flow stop valve;In straight - flow or Y - shaped globe valves, the flow of the body and the main line into a diagonal line, such flow state of the damage is smaller than conventional globe valves, so the pressure loss through the valve is also relatively small.3) plunger globe valve: this type of globe valve is a variation of the conventional globe valve.In this valve, the disc and seat are usually designed on plunger principle.The disc polished plunger is connected to the stem and the seal is made up of two elastic sealing rings that are sheathed on the plunger.The two elastic seals are separated by a thimble, and the sealing ring around the plunger is held firmly by the load applied to the cover by the bonnet nut.Elastomeric seals can be replaced and made of a variety of materials. The valve is mainly used for "open" or "close", but is available in a special form of plunger or special sleeve ring, and can also be used to regulate flow.


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