FIELD: oil industry; drilling and finishing of wells, producing of oil. SUBSTANCE: delivery of gas-liquid mixture into working chamber takes place at gas suction stroke and compression stroke through hydraulic channel from zone at outlet of working chamber delivery valve. Hydraulic channel is made in shutoff member of delivery valve and is formed by separator, filter, throttle with controlled hydraulic resistance and bushing with axial and radial holes. EFFECT: simplified design, reduced metal usage, enhanced reliability in operation. 5 cl, 2 dwg
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