| 摘要 |
FIELD: valving. ^ SUBSTANCE: ball cock comprises housing that has inlet and outlet passages and receives valving member made of tubular piston mounted in the housing for permitting movement under the action of external pressure, sealing unit movably mounted with respect to the tubular piston, and passage that connects the butt between the sealing unit and tubular piston with the atmosphere. The valving member is mounted on two axles that are axially aligned and rigidly interconnected. One of the axles is connected with the driving mechanism through the pinion. The driving mechanism is made of rod that is set inside the housing out of the zone of the through passage and two bushings movably mounted on the rod. The bottom bushing-rack is mounted for permitting cooperation with the pinion. The top bushing-piston is mounted for permitting cooperation with the piston that is mounted above the top arrester of the bushing-rack and defines the hydraulic space together with the arrester. The space is filled with oil. The central section of the rod is provided with ring projection, and the openings in the bushings are step. The inlet and outlet passages are connected with the space above the top bushing-piston through the check valves. ^ EFFECT: enhanced reliability. ^ 3 dwg |
