The shut-off valve on the pvd coating machine can be used in most medium process systems. Various forms of globe valves have been developed to meet various purposes in departments such as petrochemical, power, metallurgy, urban construction, and chemical engineering.

The use of globe valves is extremely common, but due to the large opening and closing torque and long structural length, the nominal diameter is usually limited to below 250mm, and there are also sizes up to 400mm. However, special attention should be paid to the inlet and outlet directions when selecting. Generally, the medium of shut-off valves below 15mm mostly flows into the lower part of the valve disc, while the medium of shut-off valves above 2O0mm mostly flows into the upper part of the valve disc. This is due to the closing torque of the valve. In order to reduce the opening or closing torque, globe valves above 2O0mm are generally equipped with internal or external bypass valves.
The most obvious advantages of a shut-off valve are:
During the opening and closing process, the friction between the valve disc and the valve body sealing surface is smaller than that of the gate valve, resulting in wear resistance
The opening height is generally only 1/4 of the diameter of the valve seat channel;, Therefore, it is much smaller than a gate valve.
Usually, there is only one sealing surface on the valve body and disc, so the manufacturing process is relatively good and easy to maintain. However, the drawbacks of shut-off valves cannot be ignored.
The main drawback is that the flow resistance coefficient is relatively large, resulting in pressure loss, especially in hydraulic devices, which is particularly significant.
Guangdong Huicheng Vacuum Technology Co., Ltd. is committed to the research and production of pvd coating machine. It is a leading supplier of vacuum coating machines and process solutions, with a strong after-sales team centered on customer needs, integrating production sales after-sales, and has won the approval of all sectors.
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