Safety valve is to prevent the medium pressure piping or equipment exceeds the set value, so as to achieve security objectives. Safety valve is a safety valve, its opening and closing parts of external force in a normally closed state, when the device or medium pressure inside the pipe increases, exceeds the set value automatically open, to prevent the medium pressure piping or equipment exceeds the specified value discharge to the system through the medium. Safety valves are automatic valves, mainly used for boilers, pressure vessels and piping, control pressure does not exceed the specified value, the protection plays an important role in personal safety and equipment operation.
Classification of safety valve
According to the safety valve opening height can be divided into Weiqi safety valve and safety valve, micro valve opening stroke height: ≤ 0.05d0 (minimum emissions throat diameter); safety valve opening height is smaller than or equal to 0.25d0 (minimum emissions throat diameter).
Divided according to the structural form of safety valve, to be divided into vertical hammer, lever, spring and pilot; by the body structure to points, can be divided into two closed and not closed for. Closed safety valve that is not ruled out media leaks, all along the exit discharge to designated locations, usually used in the toxic and corrosive medium. Used for air and steam safety valve, safety valve used is not closed. Selection of products for the safety valve, should according to the actual sealing pressure to determine. For the spring-loaded safety valve, in a nominal pressure (PN) range, has several spring working pressure level, in addition to specify when ordering safety valve type, name, medium and temperature, the valve sealing pressure should be specified otherwise, the maximum sealing pressure by supply.
Safety valve installation and maintenance should pay attention to the following matters:
1, various safety valve should be installed vertically.
2, the safety valve outlet should be no resistance, to avoid compression phenomenon.
3, the safety valve should be specifically tested before installation, and check its official seal.
4, the use of safety valves should be regularly checked
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