SERVOMOTOR WITH SPRING PRESSURE-ACTUATED SHUTOFF SLIDE VALVE Russian patent published in 1997 - IPC

FIELD: valving. SUBSTANCE: servomotor has piston loaded with a return spring device from one side and, from the other side, with fluid pressure exerted by the control slide valve received in the bore in the piston and loaded with outer control fluid pressure from one side and return spring of the slide valve from the other. The end of the spring opposite to the slide valve abuts against a stop secured to the one of the intermediate portions of the spring device of the piston. The ratio of the rigidity of the spring device to the rigidity of its portion interposed between the spring and stop is defined by a relationship presented in the invention description. EFFECT: enhanced efficiency. 3 cl, 1 dwg