To control the jack of the hydraulic support of the coal mine and to achieve high-pressure liquid blockage in the working cavity of the jack, so that the metal structure of the bracket plays a supporting role; When the reverse valve is switched, the hopper introduces the liquid into another cavity, at the same time opening the working cavity, the working cavity returns the liquid, the hopper is squeezed. This valve is equipped with a quick connection safety valve. Specifications Rated pressure: 50MPa Rated flow rate: 100L/min Interface diameter: K J10 or DN10 Material: medium carbon/stainless steel/1 Cr18Ni9