METHOD OF REPAIR OF GATE VALVES Russian patent published in 1998 - IPC

FIELD: repair of shut-off fittings of pipe lines. SUBSTANCE: method is mainly used for repair of wedge-type gate valves. Method consists in fitted finally machines seats in bore of body at clearance through adhesive self-hardening composition followed by assembly and hardening of composition after assembly. Prior to assembly, threads are cut in bores of body and in seats. Each seat is made with circular radial projection. Then seat is screwed into threaded bores of body through adhesive self-hardening composition. Elastic-deformation member is mounted between circular radial projections of seats or ends of seats and body to facilitate self-setting of seat being screwed-in by wedge. One elastic-deformation member provides for taking up all clearances, thus enhancing tightness of joints of seats with body. EFFECT: reduction of labor consumption; enhanced reliability. 3 dwg