FIELD: oil/gas production. SUBSTANCE: device includes hollow casing with radial passages, return valve, sealing member, annular cone and slip sockets. The device has a sleeve with a seat placed in casing/bore. Sleeve/pusher is positioned in annular cavity on the casing. A sealing member is installed on the sleeve/pusher. The sealing member is installed between the shell and annular cone. The return valve and sealing member are installed in sleeve/pusher. In so doing the sealing member is installed between the shell and annular cone. EFFECT: increased operating reliability. 5 dwg
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|---|---|---|---|
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