Backpressure-adjusting pilot operated safety valve
A pilot-operated safety valve and back pressure adjustment technology, which is applied in the field of pressure vessels or pressure pipelines, and pilot-operated safety valves, can solve the problems of easy backflow of medium and poor reverse sealing performance, so as to achieve good anti-backflow and prevent medium backflow , Reliable effect of reverse sealing performance
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Embodiment Construction
[0011] Such as figure 1 The shown back pressure regulating pilot safety valve includes a main valve and a pilot valve. The main valve includes a main valve body 1, a main valve seat 4, a main valve disc 5, and a main valve cover 21. The main valve seat 4 is installed on the main valve body 1. Between the inlet cavity and the discharge cavity, a guide sleeve 6 is installed between the main valve body 1 and the main valve cover 21. The outer circular surface of the main valve disc 5 is in dynamic sealing cooperation with the inner cavity wall of the guide sleeve 6. The back side of the main valve disc 5, A back pressure cavity 22 is formed between the inner cavity wall of the guide sleeve 6 and the lower end surface of the main valve cover 21, and a spring 23 is installed between the back of the main valve flap 5 in the back pressure cavity 22 and the lower end surface of the main valve cover 21; Valve body 9, pilot valve seat 10, pilot valve disc 11, pilot valve cover 16 and pr...
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