FDS80/50 type balanced double-sided lock is used to control the opening and locking of the coal mine hydraulic support balancing the top and bottom cavity of the domecrat, when entering one cavity, the other cavity is opened through the hydraulic control hole, the action of the domecrat; Due to the differential pressure, the pressure is no longer delayed when the liquid is returned, avoiding the frequent impact of the safety valve Shock, the so-called differential balance two-way lock. This valve is installed directly on the socket, socket and valve inlet and return hole are directly connected, the valve size is small, combined insert valve core, convenient for maintenance. This valve has a safety valve interface, there is an interface without a safety valve (Aa interface, Ba interface), which does not contain a safety valve (or an interface equipped with a safety valve). Specifications Rated flow rate: 80L/min Rated pressure: 50MPa Working medium: emulsion material: medium carbon/stainless steel/1 Cr18Ni9