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Operation method of Plug Valve adjustment

November 15, 2024
① Before the Plug Valve leaves the factory, its opening pressure should be adjusted to the set value required by the user. If the user proposes the working pressure level of the spring, it should be adjusted according to the lower limit of the pressure level before leaving the factory.
Flow regulating stainless steel plug valve
② Before installing the Plug Valve on the protected equipment or before installation, the user must readjust it at the installation site to ensure that the set pressure value of the Plug Valve meets the requirements.
③ Within the working pressure level range of the spring indicated on the nameplate, the opening pressure can be adjusted by rotating the adjustment screw to change the spring compression.
④ Before rotating the adjustment screw, the valve inlet pressure should be reduced to less than 90% of the opening pressure to prevent the valve disc from being driven to rotate when the adjustment screw is rotated, thereby damaging the sealing surface.
⑤ In order to ensure the accuracy of the opening pressure value, the medium conditions during adjustment, such as the type of medium and temperature, should be as close to the actual operating conditions as possible. The opening pressure often changes when the type of medium changes, especially when the medium accumulation state is different (for example, from liquid phase to gas phase). When the working temperature increases, the opening pressure generally decreases. Therefore, when adjusted at room temperature and used at high temperature, the set pressure value at room temperature should be slightly higher than the required opening pressure value. How high it is depends on the valve structure and material selection, and should be based on the manufacturer's instructions.
⑥ Conventional Universal Valve are used in situations where additional back pressure is fixed. When the opening pressure is adjusted after inspection (the back pressure is atmospheric pressure at this time), the set value should be the required opening pressure value minus the additional back pressure value.
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