Multifunctional pressure reducing valve

The utility model belongs to the technical field of valves, and provides a multifunctional pressure reducing valve which comprises a shell and a pressure reducing assembly, a valve cavity is formed in the valve shell, and the pressure reducing assembly is installed in the valve cavity and comprises a pressure reducing core and a pressure reducing spring which are matched with each other. The multifunctional pressure reducing valve further comprises a magnetic locking assembly which is coaxially arranged with the pressure reducing assembly. The magnetic locking assembly comprises a valve cover sleeve which is rotatably connected to the outside of the valve shell. The pressing sleeve is fixedly installed in the valve shell in the circumferential direction, and the pressing sleeve and the pressure reducing core are oppositely connected in the forward direction; one end of the valve rod is in threaded connection with the pressing sleeve, and the other end of the valve rod penetrates through the valve shell and ex