FIELD: well pumps. SUBSTANCE: plunger connected with rod is mounted in cylinder provided with suction valve in form of spherical pair - gate-seat. Proportioning unit with container for chemical reagent is made in form of nozzle having the passage for communication with container chamber. Nozzle is mounted for adjustment in height relative to the suction valve; its upper portion is made for engagement with spherical gate of suction valve for shutting off the nozzle passage in closing the nozzle. EFFECT: enhanced efficiency. 2 dwg
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