GEAR FINISHING HOLES

摘要

FIELD: oil and gas production. SUBSTANCE: invention is related in particular to devices used in development and usage of holes. Proposed gear has body with holes and conduit housing valve unit in the form of spherical shutting member with conduit uniaxial to conduit in body that is installed between two spring-loaded seats. Seats and body form two pockets which communicate with conduit of body and external space correspondingly. In addition one of seats forms together with body additional pocket communicating with conduit of body. Key is used to control valve unit. EFFECT: enhanced operational reliability of gear. 3 dwgn