Product Description Used to control the hydraulic system of the coal mine hydraulic support, control the hydraulic bracket under reverse tension of the hydraulic support to open and lock the two cavities of the piston cavity of the jacket and the cavity of the piston rod, characterized by a large passage through the reverse tension interface and a fast liquid return rate. Connections can be processed at the request of the user. Specifications Rated Pressure: Rated Flow Rate 50 MPa: 400 L/min Material: Medium Carbon/Stainless Steel/1 Cr18Ni9