How to adjust the automobile air pressure limiting valve

There is a small adjusting screw under the drying tank to loosen or tighten the air pressure.

Before leaving the factory, the pressure relief valves should be adjusted to the set values required by users one by one. If the user puts forward the working pressure grade of the spring, it should be adjusted according to the lower limit of the pressure grade.

Before installing the pressure relief valve on the protected equipment, the user must readjust it at the installation site to ensure that the set pressure value of the pressure relief valve meets the requirements.

Within the range of the working pressure grade of the spring indicated on the nameplate, the compression of the spring can be changed by rotating the adjusting screw, so as to adjust the opening pressure.

Before turning the adjusting screw, the inlet pressure of the valve should be reduced to less than 90% of the opening pressure to prevent the disc from rotating when turning the adjusting screw, thus damaging 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. When the type of medium changes, especially when the aggregation state of medium is different (such as changing from liquid phase to gas phase), the opening pressure often changes.

When the working temperature increases, the opening pressure will generally decrease.

Therefore, the set pressure at room temperature should be slightly higher than the required opening pressure when it is adjusted at room temperature and used at high temperature. The height depends on the valve structure and material selection, and should be subject to the manufacturer's instructions.

The traditional pressure reducing valve is used to fix the extra back pressure. When the opening pressure is adjusted after inspection (at this time, the back pressure is atmospheric pressure), the set value should be the required opening pressure minus the additional back pressure.