VALVE Russian patent published in 2003 - IPC

FIELD: manufacture of fittings; passive fittings for atomic and thermal power stations; chemical and oil-and-gas industries. SUBSTANCE: proposed valve has body with seat, drive chamber, piston with rod, gate and drive chamber cover with hole. Upper end face of piston is provided with helical shaft whose lower end is provided with bore and bead on its lateral surface. Bead is provided with thrust bearing. Upper end face of piston is provided with blind stepped hole located in its axis. Bush inserted in this hole is used for receiving the lower end of helical shaft secured by means of detachable cover with shim washer and fasteners. Upper end of helical shaft is provided with thread and butt for wrench; it is movably secured in cover of drive chamber and pipe rigidly secured on it. Pipe is provided with at least one pipe union fitted at area of thread on helical shaft. Fitted in said pipe union is threaded movable sector engageable with core of electromagnet. Valve gate is movably secured on rod received by through holes of gate and rod at guaranteed clearance relative to rod. Gate is fitted at spaced relation and is pressed by at least one disk spring fitted in this clearance. EFFECT: enhanced reliability of valve. 4 cl, 5 dwg