Emergency relay valve with adjustable proportion

The utility model relates to the field of relay valves, and discloses a proportion-adjustable emergency relay valve which comprises a positive pressure chamber, a negative pressure chamber, a differential pressure chamber and a pressure adjusting device used for adjusting the pressure value of the differential pressure chamber. The pressure adjusting device comprises a pressure adjusting piston used for closing the back pressure chamber, an adjusting spring used for abutting against the pressure adjusting piston and an adjusting mechanism used for controlling the adjusting spring to stretch out and draw back. The pressure regulating device further comprises an expansion amount display mechanism. And the expansion amount display mechanism is used for displaying the compression amount of the adjusting spring. The compression amount of the adjusting spring can be displayed, and the adjusting efficiency is improved. 本申请涉及继动阀的领域，公开了一种比例可调的紧急继动阀，包括正压室、反压室、差压室和用于调节所述差压室的压力值的调压装置；所述调压装置包括用于关闭反压室的调压活塞、用于抵靠住所述调压活塞的调节弹簧