Pulse type safety pneumatic valve is made up of those parts? Action principle?

impulse type safety pneumatic valve by the main safety valve, the pulse of pneumatic valve and piping.
the main safety pneumatic valve is controlled by a small pulse pneumatic valve. Under normal circumstances, the pneumatic valve by high pressure steam pressure, tightly closed. Small pulse pneumatic valve opens first, by the pneumatic valve piston guide steam pipe into the main steam, the steam pressure on the piston can overcome the spring compression force, therefore, open the valve on the main air exhaust steam pressure; Steam flow on the piston is cut off, and the main safety pneumatic valve closed again. And the residual steam on the piston can buffer role, make the main pneumatic valve slowly closing, so as to avoid pneumatic disc damage due to collision with the pneumatic valve seat.

security pneumatic valve manufacturers recommend; Good workmen pneumatic valve group co. , LTD