POWER PLANT Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: case 18 of hydraulic transformer 1 is provided with two- position electromagnet valve 19 coupled with passage 21 of low pressure. Working spaces 8,9 of servo-piston 7 are connected to a sensitive member through hydraulic lines 16,17. Hydraulic switch is made of slide 23 which is positioned within case 18 and has central passage 24 coupled with source 15 of high pressure. Differential piston 25 is rigidly secured to slide 23 and forms two chambers 26,27 together with case 18. Chamber 27 is in communication with passage 24 through valve 19 and jets 29,30 arranged in series. The jet of grater cross- section is provided in piston 25 and lower cross-section in case 18. Jet 29 is separated from chamber 27 with contact ring sealing collar 31. As the result returning to emergency operation is excluded when a signal at valve 19 is absent so preventing against emergency distortion of a generator. EFFECT: enhanced reliability. 4 dwg