VALVE FOR SMOOTH CONTROL OF WORKING MEDIUM FLOW RATE Russian patent published in 2003 - IPC

FIELD: pneumohydraulic fittings; smooth control of flow rate of gases and liquids. SUBSTANCE: proposed valve has body, two chambers with inlet and outlet holes, seat located between said chambers and shut-off and control members made in form of stem with threaded part whose diameter exceeds diameter of stem and taper shut-off member located in lower part. Washer made from plastic material is used as seat. Diameter of hole of this washer is more than minimum diameter of taper shut-off member and is lesser than its maximum diameter. Lower end part of threaded portion of stem partially adjoins taper shut-off member. It is located in area of outlet chamber having outlet hole. Outlet chamber is communicated with threaded portion of stem by at least one hole. Lower end plane of threaded portion adjoins upper plane of washer when valve is fully closed. EFFECT: enhanced smoothness of control of flow rate. 6 cl, 3 dwg