CHECK VALVE Russian patent published in 2003 - IPC

FIELD: mining, particularly, oil and gas producing and refining industries; applicable in oil-gas field equipment converging oil, gas, aggressive media and water, in high-pressure hydraulic systems. SUBSTANCE: check valve has body in form of sleeve with axle and conical surface on bottom serving as partition for shutoff member. Axle end has thread for stabilizer with conical surface and holes for fluid passing. Shutoff member is made with companion said conical surfaces and located on sleeve axle for motion and closing of holes of partition and stabilizer. EFFECT: increased check valve reliability and its service lift. 2 dwg