Used to control the hydraulic system of the coal mine hydraulic bracket, control the hydraulic bracket with the reverse tension of the dry jacket, piston cavity and piston rod cavity opening and locking, characterized by the large diameter of the passage of the reverse tension interface, fast liquid return rate. Connections can be processed at the request of the user. Specifications Rated pressure: 50MPa Rated flow rate: 200L/min, 400L/min Working medium: emulsion Material: medium carbon/stainless steel/1 Cr18Ni9