Hydraulic controlled one-way valve is generally used to control the hydraulic support rack of the coal mine and block the high-pressure liquid in the bottom cavity, so that the rack plays an auxiliary role; When the upper cavity of the column introduces liquid while giving liquid to control the recognition, the lower cavity of the column is unlocked so that the column falls. And by adjusting the opening pressure of the safety valve installed on the hydraulically controlled one-way valve, the working resistance of the hydraulic support is in the nominal value. General design of such valves, metal hard seal or polyformaldehyde hard seal, valve core insert components, reliable operation, long service life of the valve, convenient maintenance. Specifications Rated pressure: 50MPa Rated flow: 500L/min, 400L/min, 200L/min Interface Pass: interface in table or user needs interface Material: medium carbon/stainless steel/1 Cr18Ni9