FIELD: oil producing industry; oil-well sucker-rod pumps.
SUBSTANCE: polished rod of pumping unit is sealed by slot seal passed through cylinder liner hermetically connected with delivery valve, and valve with through holes to control gas flow is made in form of truncated cone and is made of material whose density is lower than oil density. Delivery valve is installed in upper part of cylinder on partition in form of hemisphere with through hole closed by valve with flat seat surface.
EFFECT: prevention of sand lodging between valve and seat, reduced loads on drive part of unit operating in purposely slanted wells.
4 cl, 1 dwg
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