Safety valve is also called relief valve. Safety valve as the name suggests is to ensure the pressure pipeline, pressure vessel key safety application guarantee, in order to ensure the normal operation of the safety valve and extend the service life of the safety valve, in use should be done regularly check whether the operation of the safety valve leakage, blocking and spring rust and other abnormal phenomena, and pay attention to observe the adjustment screw sleeve and adjustment ring tightening screw lock nut is loose. If any problem is found, take proper maintenance measures in time. The safety valve should also be removed regularly for comprehensive cleaning, inspection and re-grinding, setting before re-use. The safety valve installed in the outdoor should take appropriate protective measures to prevent rain, fog, dust, rust and other dirt from invading the safety valve and discharge pipe, when the environment is lower than zero degrees Celsius, the necessary anti-freeze measures should be taken to ensure the reliability of the safety valve operation

Safety relief valve has spring type and rod type two categories. In addition, there are impulse type safety valve, pilot type safety valve, safety switch valve, safety decompression valve, deadweight safety valve and so on. Spring type safety valve mainly relies on the force of the spring and work, spring type safety valve and closed and not closed, generally flammable, explosive or toxic media should be selected closed, steam or inert gas can be selected not closed, in the spring type safety valve with a wrench and without a wrench. The function of the wrench is mainly to check the flexibility of the valve disc, and sometimes it can be used as a manual emergency pressure relief. The lever safety valve mainly relies on the force of the lever weight to work, but the large volume of the lever safety valve often limits the selection range. Use a safety valve with radiator when the temperature is high.

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