The working principle of vacuum negative pressure pneumatic safety valve

vacuum negative pressure pneumatic valve has spring type safety and bar type two kinds big. And impulse pneumatic type safety valve, pilot operated safety pneumatic valve, pneumatic valve switching, security, decompression pneumatic valve, pneumatic valve static weight type safety, etc. Pneumatic valve spring type safety relies mainly on the spring force and work, spring loaded safety in pneumatic valve is closed and not closed, usually inflammable, explosive or toxic medium should choose enclosed, steam or inert gases can choose not enclosed, in the spring loaded safety pneumatic valve with a wrench and not with a wrench. Spanner role is mainly check the pneumatic disc flexibility, sometimes also can be used as a manual emergency pressure relief.
how it works:
security pneumatic valve in the system of security protection. E. , when the system pressure exceeds safety pneumatic valve open, statins are part of the gas system to the atmosphere, make the system pressure shall not exceed the allowable values, thus ensuring the system is not an accident because the pressure was too high. Safety pneumatic valve is also called the overflow valve. Graphic form for safety several typical structures of pneumatic valve. The figure for a pneumatic piston type safety valve, pneumatic valve core is a tablet. Air pressure in A piston, when pressure exceeds set by spring force TVC, the piston is A top drive, part of the compressed air from the pneumatic valve mouth namely atmosphere; When air pressure is lower than the TVC, spring driving the piston down, close the pneumatic valve.