Before leaving the factory, the opening pressure of the Pressure seal valves should be adjusted one by one to the set value required by the user. If the user proposes the working pressure level of the spring, it should generally be adjusted according to the lower limit of the pressure level.
Before installing the Pressure seal valvese to the protected equipment or before installation, the user must re-adjust at the installation site to ensure that the set pressure value of the Pressure seal valvese meets the requirements.
The opening pressure can be adjusted by rotating the adjustment screw to change the compression of the spring within the range of the working pressure level of the spring indicated on the nameplate.
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, which may damage the sealing surface.
In order to ensure the accuracy of the opening pressure value, the medium conditions during adjustment, such as medium type and temperature, should be as close as possible to the actual operating conditions. The type of medium changes, especially when the accumulation state of the medium is different (for example, from a liquid phase to a gas phase), the opening pressure often changes. Increase in operating temperature
When, the opening pressure is generally reduced. Therefore, when adjusting at room temperature for high temperature, the set pressure value at room temperature should be slightly higher than the required opening pressure value. How high it is is related to the valve structure and material selection, and should be based on the manufacturer's instructions.
