Underpressure after the valve automatically shuts down the regulator
An automatic closing and pressure regulator technology, applied in valve details, safety valves, balance valves, etc., can solve the problems of user safety hazards in downstream pipeline maintenance operations, failure to automatically close the main valve pilot in time, etc., and achieve the safety of maintenance operations. High performance, simple structure, convenient installation and use
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[0016] Embodiments of the present invention are further described below in conjunction with the accompanying drawings:
[0017]A post-valve under-pressure automatic shut-off pressure regulator, which is mainly composed of a main valve 3 connected and installed between the input pipe 6 before the valve and the output pipe 23 after the valve, the main diaphragm box 21 equipped with the main valve 3, the regulating valve The pressure commander ZH, the back pressure controller HK and the front pressure signal tube 13, the signal conduit 15, the signal output tube 14, the signal return tube 20, the main tune back pressure tube 19 and the command back pressure tube 16 constitute. The main valve 3 is equipped with a main regulating valve rod 9, a main regulating spring 2, a valve sleeve 7, and a valve core 8 to form a pressure regulating structure for regulating the opening degree of the main valve port 22. The main adjustment diaphragm 11 is installed in the main adjustment diaphrag...
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