TURBINE PROTECTIVE DEVICE Russian patent published in 2001 - IPC

FIELD: protection of turbines. SUBSTANCE: proposed device has pump-regulator, overspeed governor, automatic gate valve and unit for working-out overspeed governor with spool valves. Inter-piston cavities of spool valves are connected to pressure end of pump-regulator and to turbine oil tank by means of oil line. Inter-piston cavities are also connected in pairs to oil line connected with drive of locking valve of turbine and to oil line connected with end chamber. Overspeed governor and automatic gate valve are located on side of suction end of pump-regulator which is provided with torsion bar having hole for overspeed governor; spool valve is fitted in bore available in body and cap of bearing coaxially with turbine rotor. Spool valve has four additional inter-piston cavities first of which is connected to pressure end of pump-regulator and to drive of locking valve; second cavity is connected to discharge end of pump-regulator and is hydraulically connected with third inter- piston cavity connected in its turn to end chamber of automatic gate valve and to turbine oil tank together with end chamber of spool valve of device. Inter-piston cavity of spool valve of automatic gate valve is connected to turbine oil tank through fourth inter-piston cavity of spool valve of device. EFFECT: enhanced operational reliability. 3 dwg