FIELD: petroleum industry. SUBSTANCE: bush of the working wheel adjoins the tap through a thickening on the diameter making up 0.9-1.1 of the outer diameter of the paddles and forms with the tap a discharging chamber. The latter is communicated with the tap cavity with the aid of by-pass channels in the bush of the working wheel. The connector of the housing and the cover is located in the discharging chamber. EFFECT: simpler design. 1 cl, 1 dwg
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