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How to correctly understand the valve, to grasp the difference between each valve, in the purchase of the valve to know what kind of valve. The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The valve stem opening or closing stroke is relatively short, and has a very reliable cut-off action, making this valve is very suitable for use as a medium cut or adjustment and throttling. Cut-off valve once in the open condition, it is no longer between the valve seat and valve sealing surface contact, and has a very reliable cut-off action, this valve is very suitable for cutting or regulating the use of media and throttling.
The valve clack is polished to connect the plunger and the valve stem, and the seal is realized by two elastic sealing rings on the plunger. The two elastic sealing rings are separated by a collar, and the sealing rings around the plunger are pressed firmly by the load applied to the bonnet by the bonnet nut. Elastic sealing ring can be replaced, can be made of a variety of materials, the valve is mainly used for "open" or "off", but with a special form of plunger or special collar, can also be used to adjust the flow.
Once the cut-off valve is in the open state, its valve seat and valve sealing surface is no longer in contact, so its sealing surface mechanical wear is small, because most of the valve seat and valve is relatively easy to repair or replace the sealing element without removing the entire valve from the pipeline, which is suitable for the valve and pipeline welding into one occasion. Medium through such valves when the flow direction has changed, so the flow resistance of the valve is higher than other valves.
Commonly used cut-off valves are the following: 1) angle type cut-off valve; in the angle type cut-off valve, the fluid only needs to change the direction, so that the pressure drop through the valve is smaller than the regular structure of the cut-off valve. 2) DC cut-off valve; In DC or Y-shaped cut-off valve, the flow channel of the valve body forms an oblique line with the main flow channel, so that the damage degree of the flow state is smaller than that of the regular cut-off valve, so the pressure loss through the valve is correspondingly small. 3) Plunger type globe valve: This form of globe valve is a variant of regular globe valve. In this valve, the disc and valve seat are usually designed based on the plunger principle.