In the DC or Y-shaped stop valve, the flow path of the valve body and the main channel into a slash, so that the flow of the degree of damage than the conventional Globe Valve is small, and thus through the instrument valve pressure loss is correspondingly small.
Commonly used Globe Valve has the following:
1, DC-type Globe Valve: In the DC or Y-shaped valve, the valve body flow channel and the main channel into a slash, so that the flow of the degree of damage than the conventional Globe Valve to small, and thus through the instrument valve pressure loss Corresponding small.
2, the angle of the Globe Valve: In the angle-type valve, the fluid only need to change the direction, so that the pressure through the instrument valve pressure smaller than the conventional structure of the valve.
3, plunger-type Globe Valve: This form of Globe Valve is a conventional Globe Valve variant. In the instrument valve, the valve and valve seat is usually based on the principle of the design of the plunger. The disc is polished and the plunger is connected to the stem, and the seal is achieved by two elastic seals mounted on the plunger. The two elastomeric seals are separated by a collar and are pressed against the seal around the plunger by the load applied to the bonnet by the bonnet nut. The elastic seal can be replaced and can be made of a wide variety of materials. The instrument valve is mainly used for "open" or "off", but with a special form of plunger or special collar, can also be used to adjust flow.
Use of Globe Valve:
The valve stem of the stop valve is perpendicular to the sealing surface of the valve seat. Stem opening or closing stroke is relatively short, and has a very reliable cutting action, making this instrument valve is very suitable as a medium cut or adjust and throttling use.
Once the valve valve valve is open, its valve seat and the valve seal surface is no longer between the contact, and has a very reliable cutting action, together that the instrument valve is very suitable as a medium cut or adjust and Throttle use.
In addition, once the stop valve is in the open state, its valve seat and the valve seal surface is no longer between the contact, so its sealing surface mechanical wear less, because most of the valve seat valve and the valve is easier to repair Or replace the sealing element without the need to remove the entire instrument valve from the pipeline, which for the instrument valve and pipeline welding into one place is very suitable. The flow direction of the medium through such instrumentation valve changes, so the flow resistance of the valve is higher than other instrument valves.