Safety valve installation and maintenance and precautions
The safety valve is a kind of valve for safety protection. The opening and closing part of the safety valve is normally closed under the action of external force. When the medium pressure in the equipment or pipeline rises and exceeds the specified value, it is automatically opened and prevented by discharging the medium outside the system. The pressure of the medium in the pipeline or equipment exceeds the specified value. The safety valve is an automatic valve. The safety valve is mainly used on boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value and plays an important role in personal safety and equipment operation.
According to the safety valve disc opening height can be divided into micro-relief safety valve and full-open safety valve, micro-lift safety valve opening stroke height: ≤ 0.05d0 (minimum discharge throat diameter); full-open safety valve open Height is ≤0.25d0 (minimum discharge throat diameter).
The safety valve is divided according to the structural form, which is divided into the vertical hammer type, the lever type, the spring type, and the pilot type (pulse type). According to the valve body structure, it can be divided into two types: closed type and non-closed type. Closed-type safety valves, which exclude the leaked media, are discharged along the outlet to designated locations and are generally used in toxic and corrosive media. For air and steam safety valves, non-hermetic safety valves are often used. For the selection of safety valve products, it should be determined according to the actual sealing pressure. For spring-loaded safety valves, springs with several working pressure levels within a nominal pressure (PN) range, except when specifying the type, name, medium, and temperature of the safety valve when ordering, the sealing pressure of the valve body should be stated , otherwise supply according to the maximum sealing pressure.
Safety valve installation and maintenance should pay attention to the following matters:
All kinds of safety valves should be installed vertically.
There should be no resistance at the outlet of the safety valve to avoid pressure.
The safety valve should be specifically tested before installation and checked for leak tightness.
The safety valve in use should be checked regularly.
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