Adjustment of opening pressure:

① Before leaving the factory, the opening pressure of the safety valve should be adjusted one by one to the setting value required by the user. If the user puts forward the spring working pressure level, it should be adjusted according to the lower limit of the pressure level.

② Before installing the safety 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 safety valve meets the requirements.

③ Within the working pressure range of the spring indicated on the name plate, the opening pressure can be adjusted by changing the compression amount of the spring by rotating the adjusting screw.

④ Before rotating the adjusting screw, the valve inlet pressure should be reduced to less than 90% of the opening pressure, so as to prevent the valve disc from being driven to rotate when the adjusting screw is rotated, thus damaging the sealing surface.

⑤ In order to ensure the accuracy of the opening pressure, the medium conditions, such as medium type and temperature, should be adjusted as close to the actual operating conditions as possible. When the type of medium changes, especially when the accumulation state of the medium is different (for example, from liquid phase to gas phase), the opening pressure often changes. When the working temperature increases, the opening pressure generally decreases. Therefore, when it is adjusted at normal temperature and used for high temperature, the set pressure value at normal temperature should be slightly higher than the required opening pressure value. The degree to which the valve structure and material selection are related, should be based on the manufacturer's instructions.

6. When the conventional safety valve is used to fix additional back pressure, the setting value should be less than the required back pressure when the opening pressure is adjusted after testing.