FIELD: fitting manufacture, namely closing fluid flow according to automatic self-adjustment and wear degree of sealed surfaces. SUBSTANCE: valve unit includes housing with cavity, flow-through opening for fluid flow crossing cavity of housing, covers and locking member. Means for controlling fluid flow is placed in cavity of housing for selectively opening or closing flow-through opening of housing. Means for controlling fluid flow includes unit for controlling valve, rod having axle and connected with means for controlling fluid flow by connecting device, unit for displacing rod. Connecting device provides possibility for axial displacement of rod relative to means for controlling fluid flow without rotation at keeping means for controlling fluid flow in rest. Unit for displacing rod in operation mode is joined with unit for controlling valve and with rod for selectively moving it during successive stages including only axial motion, subsequent rotation at moving unit for controlling valve in one direction, then rotation and only axial motion at moving unit for controlling valve in other direction. Locking member is mounted on means for controlling fluid flow for axial displacement of rod and for transferring effort of rod to means for controlling fluid flow. When unit for controlling valve moves in one direction, means for controlling fluid flow is released from axial effort acting upon it and then rod rotates. When unit for controlling valve moves in other direction rod rotates. Then means for controlling fluid flow is loaded by axial effort acting upon it from rod side and providing additional sealing at selected position of valve. EFFECT: enhanced operational reliability of valve. 10 cl, 3 dwg
