Vacuum negative pressure safety valve

There are two types of vacuum negative pressure safety valves: spring type and rod type. In addition, there are impulse safety valve, pilot safety valve, safety switching valve, safety decompression valve, dead weight safety valve, etc. The spring-type safety valve mainly relies on the force of the spring to work. There are closed and non-closed spring-type safety valves. Generally, the flammable, explosive or toxic medium should be closed, and the steam or inert gas can be closed. There are spring-loaded safety valves with and without wrench. The function of the wrench is mainly to check the flexibility of the valve disc, and sometimes it can also be used for manual emergency pressure relief. Working principle: The safety valve plays a role of safety protection in the system. When the system pressure exceeds the specified value, the safety valve is opened, and part of the gas in the system is discharged into the atmosphere, so that the system pressure does not exceed the allowable value, so as to ensure that the system does not have an accident due to excessive pressure. Safety valve is also called overflow valve. The figure shows several typical structural forms of safety valves. Figure a is a piston safety valve, the valve core is a flat plate. The air source pressure acts on the piston A. When the pressure exceeds the safe value determined by the spring force, the piston A is pushed open, and a part of the compressed air is discharged into the atmosphere from the valve port; when the air source pressure is lower than the safe value, the spring drives The piston moves down, closing the valve port.
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