FIELD: engines and pumps.
SUBSTANCE: invention relates to machine building, particularly, to oil field equipment. Claimed unit comprises housing (1), linear motor (2), secondary element (7), plungers (8, 9), cylinders (10, 11), two pairs of intake and discharge valves (14, 15) and (17, 18). Besides, this unit comprises the drain solenoid valve (22) connected with oil well tubing (16). Extra diaphragms (13, 20) shaped to flattened cylinders are fitted therein. Said diaphragms are rigidly fitted between every cylinder (10, 11) and the pairs of valves.
EFFECT: increased MTBR.
2 dwg
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