(1) The strength test of the safety valve is the same as other valves, which are tested with water. When testing the lower part of the valve body, the pressure is introduced from the I=I end, and the sealing surface is closed; When Testing The Upper Body And Cover, The Pressure IS Introduced From The el end and the other ends are closed. No leakage in the valve body and cover within the specified time is qualified.
(2) Sealing test and constant pressure test, the general use of medium is: steam valve with saturated steam as the test medium; Ammonia or other gas valves with air as the test medium; Valves for water and other non-corrosive liquids use water as the test medium. For some important positions of the safety valve commonly used nitrogen test medium.
The seal test shall be carried out with nominal pressure as the test pressure, and the number of tests shall not be less than two times, and no leakage within the specified time shall be qualified. There are two methods of leakage detection: one is to seal the joints of the safety valve, and paste the tissue paper on the El flange with butter. The tissue paper is filled with leakage and not filled with qualified; The second is to use butter to seal the thin plastic plate or other plate in the lower part of the export flange, irrigation sealed valve disc, test water does not bubble for qualified.
