FIELD: deep well drilling technique; switching of flushing fluid flow. SUBSTANCE: when control ball is lowered, pressure rises and side surfaces of contact members begin interacting with steps of straight and inclined recesses of bushing rigidly connected with drive member. As a result, hydraulic control valve is turned through one step precisely to switch fluid flow from one hole in body to the other. EFFECT: higher efficiency. 9 cl, 7 dwg
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