BALANCED ACTUATOR VALVE Russian patent published in 2003 - IPC

FIELD: power engineering. SUBSTANCE: invention is designed for use as steam turbine actuator valves. Proposed balanced actuator valve contains steam box and axially installed main valve with shaped locking bowl and diffuser seat, driven rod, balanced valve with locking bowl and seat, safety cup with steam ports and shaped bushing with axial channel. Shaped bushing is installed on locking bowl of main valve. Locking bushing with conical nose part is installed for overlapping axial channel of shaped bushing at lifting of rod by its conical nose part. Unloading chamber is made as space formed by shaped bushing and bowl of main valve with seat of relief valve. valve is furnished with additional unloading chamber made in form of space. Said space is formed by seat of relief valve from side of its outlet hole and inner surface of locking bowl of main valve, and it communicates with its outer surface by through channels made in bowl. Outlet holes of through channels are located below seating diameter of locking bowl of main valve and are uniformly spaced over its shaped surface. EFFECT: prevention of vibrations in steam turbine valves, reduced load on rod, improved reliability and increased service life of valve. 3 cl, 2 dwg