Common classification and selection of globe valve

by:Lianke Valve     2022-08-13
Commonly used globe valves include DC globe valves, angle globe valves, and plunger globe valves. Their characteristics are as follows. 1) DC globe valve: In the DC or Y-shaped globe valve, the flow channel of the valve body and the main channel form an oblique line, so that the degree of damage to the flow state is smaller than that of the conventional globe valve, so the pressure loss through the instrument valve is also reduced. Correspondingly small. 2) Angle globe valve: In the angle globe valve, the fluid only needs to change direction once, so that the pressure drop through the instrument valve is smaller than that of the conventional structure globe valve. 3) Plunger globe valve: This form of globe valve is a variant of the conventional globe valve. In this instrument valve, the disc and seat are usually designed based on the plunger principle. The valve disc is polished so that the plunger is connected with the valve stem, and the sealing is realized by two elastic sealing rings sleeved on the plunger. The two elastomeric seals are separated by a collar and compress the seal around the plunger by the load applied to the bonnet by the bonnet nut. Elastomeric seals are replaceable and can be made of a variety of materials, the instrument valve is mainly used for 'open' or 'close', but is available with special forms of plungers or special collars, which can also be used for adjustment flow. Globe valve selection guide The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable shut-off action, which makes this instrument valve very suitable for medium shut-off or regulation and throttling. Once the disc of the globe valve is in the open state, the contact between its seat and the sealing surface of the disc is no longer in contact, and has a very reliable cut-off action, so this instrument valve is very suitable for cutting or adjusting the medium. Throttling usage. Once the globe valve is in the open state, there is no longer any contact 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. It is not necessary to disassemble the entire instrument valve from the pipeline when sealing the element, which is very suitable for the occasion where the instrument valve and the pipeline are welded into one. The flow direction of the medium through this type of instrument valve is changed, so the flow resistance of the globe valve is higher than that of other instrument valves.
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