Commonly used globe valve has the following kinds: (1) Once-through cut-off valve: in once-through or y-shaped cut-off valve, the valve port from the mainstream way into a diagonal lines, so that the flow state damage than conventional globe valve is small, thus the instrument valve through the pressure loss and the corresponding small. 2) Angle type globe valve: in Angle type cut-off valve, fluid can change direction at a time, so that through this instrument valve pressure drop is smaller than conventional structure of the valve. 3) Plunger valve: this form of cut-off valve is normal variant of globe Industrial Valves. In the instrument valve, the valve disc and seat is usually designed on the basis of the principle of plunger. Disc polishing pillars plug connected to the stem, the seal is set in the column inserting two elastic sealing ring. Two elastic sealing ring with a set of rings is separated, and through the bonnet nut of load on the valve cover pressed around the plunger seal. Elastic sealing ring can be replaced, can use a variety of materials, the instrument valve is mainly used in the 'on' or 'off', but with a special form of plunger or special thimble, can also be used to adjust flow. Globe valve selection guidelines: globe valve stem and valve seat sealing surface vertical axes. Open or close the valve stem travel relatively short, and very reliable cutting action, make this instrument valve is very suitable for used as medium cut or adjust and throttling. Cut-off valve disc once in an open position, it is no longer the contact between the seat and clapper sealing surfaces, and have cut off action is very reliable, very close to the instrument valve suitable for used as medium cut or adjust and throttling. 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 Industrial Valves seat and valve disc is easy to repair or replace the whole instrument valve sealing components without removed from the pipeline, for the instrumentation valves and pipeline welding into one occasion is very applicable. Flow direction of medium through such instrument valve has changed, so stop valve flow resistance is higher than other instrument valves.
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