1, the relief valve factory, one by one to adjust its opening pressure to the user requirements of the setting value. If the user puts forward the working pressure level of the spring, press the lower limit of the pressure level to adjust the factory normally. 2, the user in the relief valve installed on the device to be protected or before installation, must be re-adjusted at the installation site to ensure that the pressure relief valve setting pressure value to meet the requirements. 3, In the nameplate of the spring work pressure level range, by changing the spring screw to adjust the amount of compression, you can adjust the pressure on the opening. 4, before rotating the adjusting screw, the valve inlet pressure should be reduced to less than 90% of the opening pressure to prevent the valve disc from being rotated when the adjusting screw is rotated, so as to damage the sealing surface. 5, in order to ensure the opening pressure is accurate, the media conditions should be adjusted, such as the type of medium, temperature, etc. as close as possible to the actual operating conditions. Changes in the type of media, especially when the media is not the same state of accumulation (for example, from liquid to gas phase), the cracking pressure often varies. Operating temperature increases, the opening pressure is generally reduced. Therefore, when adjusted at room temperature for high temperature, the setting pressure at room temperature should be slightly higher than the required opening pressure. To what extent and the valve structure and material selection are related, should be based on the manufacturer's instructions. 6. Where the conventional relief valve is used for fixing an additional back pressure, when the cracking pressure is adjusted after the test (the back pressure is atmospheric pressure at this time), the setting value should be the required cracking pressure minus the additional back pressure.
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