SAFETY MAKE-UP VALVE MECHANISM Russian patent published in 2000 - IPC

FIELD: safety make-up valves for power hydraulic drives. SUBSTANCE: valve mechanism includes main valve, control valve, throttle and screw pair. Main valve is forced by means of spring to working edge in casing. Control valve is forced by means of power spring. Throttle provided in main valve connects over-valve cavity of main valve with over-valve cavity of control valve. Screw pair adjusts effort of control valve. Control valve is in the form of stud having cone surface on one side and threaded surface on its other side. Power spring and adjusting screw pair are arranged inside main valve. Power spring is mounted in such a way that it rests upon surface of main valve and washer and it may force working surface of control valve to edge provided in main valve at side of draining line. Washer is secured to stud of control valve. EFFECT: reduced dimensions and simplified design of valve mechanism. 1 dwg