Hydraulic control one-way valve is generally used in coal mine hydraulic support column control and lower cavity high-pressure liquid locking, so that the column plays a supporting role; when the liquid is injected into the upper cavity of the column, at the same time, the liquid is supplied to the hydraulic control mouth, the lower cavity of the column is unlocked, and the column is lowered. 

And by setting the opening pressure of the safety valve installed in the hydraulic control one-way valve, the working resistance of the hydraulic support is at the rated value. 

The overall structure of this kind of valve, metal hard seal or polyformaldehyde hard seal, plug-in spool assembly, reliable work, long valve life, convenient maintenance.