The safety valve in the system play a security role. When the system pressure exceeds the set value, the safety valve Ting open, part of the system of gas or liquid is discharged into the atmosphere, the system pressure does not exceed the allowable value, thus ensuring the system is not an accident due to excessive pressure. The safety valve and relief valve. Several typical structure of safety valve. Piston type safety valve, a valve plate. Air pressure acting on the piston a, when the pressure exceeds the spring force to determine the safety value, the piston a is the top open, a portion of the compressed air into the atmosphere from the valve port; when the air pressure below the safety value, the spring-driven piston down, close the valve port.
The ball-type and diaphragm-type safety valve, working principle is identical with the piston. The three control valves are available spring force, spring preload adjustment, you can change the security value, it is called direct-acting relief valve. Pilot operated safety valve, control pressure acting on the diaphragm with small direct-acting valve, diaphragm is the spool on the hard core, the pressure on the seat. When the air pressure is greater than a safe pressure, the valve open, compressed air output from the left side hole into the atmosphere. Pressure characteristics of diaphragm type safety valve and pilot safety valve is good, sensitive action; but the biggest opening force is relatively small, the poor flow characteristics. In practical application, should be based on the actual needs of the type selection of safety valve, and based on the maximum discharge capacity to choose their path.
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