Pressure test method of stop valve and throttle valve

For the strength test of stop valve and throttle valve, the assembled valve is usually placed in the pressure test frame, the valve disc is opened, the medium is injected to the specified value, and the body and bonnet are checked for sweating and leakage. The strength test can also be carried out on a single piece. Only stop valve is used for sealing test. During the test, the valve stem of the stop valve is in a vertical state, the valve disc is opened, and the medium is introduced from the lower end of the valve disc to the specified value. Check the packing and gasket; After passing, close the disc and open the other end to check for leakage. If the valve strength and sealing test are to be done, the strength test can be done first, and then depressurized to the specified value of sealing test, and the packing and gasket shall be checked; Then close the valve disc and open the outlet end to check whether the sealing surface leaks.