FIELD: well boring technology. SUBSTANCE: device has hydraulic cylinder with a butterfly governor and forcer- rod with guiding shelves, divertible member with slots for forcer-rod guides, reciprocating spring, bearing and a diverting member. Forcer-rod is equipped with cams with beveled ends, placed evenly along forcer diameter. Diverting member is fixed in hydraulic cylinder and is equipped with slots for guiding shelves of forcer-rod and with cams with beveled ends, located as mirror reflection of forcer-rod cams and being radially displaced towards the latter. EFFECT: increased reliability of diverter operation. 3 cl, 4 dwg
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