| Safety valve structure mainly has two categories: spring and lever type. Spring type refers to seal the valve flap and valve seat by a spring force. Lever on the lever and the hammer action. With the need of large capacity, and a pulse type safety valve, also known as the pilot type safety valve, composed of the main safety valve and the auxiliary valve. When more than the medium pressure pipeline specified in pressure value, the auxiliary valve opens first, medium along the catheter into the main safety valve, and the main safety valve open, make the medium increased pressure to reduce.
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