The hydraulic control one-way valve is mainly used to lock the liquid in the working cavity of the column or Jack so as to maintain the rated pressure. when the liquid is injected into the other cavity of the column or Jack, the liquid is supplied to the control cavity of the valve and the valve [] is opened to reflow the liquid in the working cavity of the column or Jack. 
Implement the standard MT419- 1995 "valves for hydraulic supports" .

Structure and its working principle. 

The product is manufactured strictly according to the technical standard of MT419-1995 "hydraulic support Valve" of the Ministry of Coal and manufactured by CNC lathe with high precision. The cost valve is an one-way valve in the form of plane seal of rubber 0-ring and metal valve body. There are three liquid holes on the valve body. When the high pressure liquid enters through hole I in the system, the spring force behind the one-way valve body is overcome, II enters the working cavity of the cylinder body through the hole, and the liquid flow stops entering. 

Under the action of hydraulic pressure and spring force, the valve core presses the valve seat and the one-way valve is closed. 

When liquid return is needed, control the liquid flow through the hole | enter, push the ejector rod to overcome the pressure and spring the liquid in the working cavity of the valve core to flow out of the hole II.