A safety valve is a special valve whose opening and closing parts are normally closed under the action of external force. When the medium pressure in the equipment or pipeline rises above the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. . Safety valves belong to the category of automatic valves, which are mainly used in boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value, and it plays an important role in protecting personal safety and equipment operation. Note that the safety valve must be pressure tested before it can be used.

The safety valve plays a role of safety protection in the system. When the system pressure exceeds the specified value, the safety valve opens to discharge part of the gas/fluid in the system into the atmosphere/pipe, so that the system pressure does not exceed the allowable value, so as to ensure that the system does not cause accidents due to excessive pressure.