GATE Russian patent published in 2003 - IPC

FIELD: pipeline valves and fittings. SUBSTANCE: invention is designed for reliable closing of pipelines. Proposed gate contains housing, damper installed in housing with seats. Seats are made in form of telescopic bushings spring-loaded relative to housing. Bushings provided with sealing units form ring space in between. Bushings are furnished with mating beads forming variable-volume chamber in between. Said chamber communicates with ring space. Outer bushing is provided with additional bead to form adjacent chamber of variable volume. Variable-volume chamber communicates through channel in inner bushings with through hole of gate. EFFECT: improved operating reliability of gate. 4 cl, 5 dwg