Safety valve water calibration method must be repeated several times at constant pressure, stable until, some units for safety and economic reasons, the required pressure more than 20MPa safety valve are not allowed to use compressed air check must be water, they do so after gaining experience in the equally good results. Because in theory, the pressure value at room temperature has nothing to do with the properties of the medium.
Therefore, the normal temperature of the safety valve calibration platform should be gas and water.
The check table of the safety valve should be static and slow step up, which can not affect the accuracy of the pulse pressure boost.
The pressure gauge of the safety valve calibration table or the reading accuracy of the recorder should be higher than 1%.
Safety valve spring:
Determination of spring safety valve spring quality directly affect performance, but due to a variety of safety valve spring design data, the manufacturer does not provide spring design. Therefore, the safety valve conditions can be simple qualitative linear.
