According to the safety valve opening height can be divided into enlight type safety valve and a full Kai type safety valve, enlight type safety valve opening stroke height is less than or equal to 0.05d0 (minimum emissions throat diameter); full Kai type safety valve opening height is less than or equal to 0.25d0 (minimum emissions throat diameter).
According to the structural form of safety valve, to be divided into vertical hammer type, lever type, spring type and pilot type (pulse type), according to the structure of the valve body, can be divided into two types of closed and not closed. Closed type relief valve that is excluded from the media, all along the export discharge to the designated location, generally used in toxic and corrosive media. For air and steam safety valve, more use of non closed type safety valve. For the selection of safety valve products, should be determined according to the actual sealing pressure. For the spring type safety valve, in a nominal pressure in the range of (PN), with several working pressure level of spring, when ordering in addition to indicate the safety valve type, name, medium and temperature, there should be marked pressure valve seal otherwise, according to the maximum sealing pressure supply.
Safety valve installation and maintenance should pay attention to the following matters:
All kinds of safety valve should be installed vertically. Safety valve outlet should be no resistance, to avoid pressure phenomenon. Safety valve should be installed before the special test, and check its official seal. On the use of safety valves should be regularly checked.
