| 摘要 |
A double-acting oil-well pump in which continuous flow movable pistons are rigidly connected to each other through x-like part, on the outer surfaces of those check valves are placed, motion of those is restricted by provided parts permeable for liquid. To the upper part a rod is attached, this connects the movable pistons to drive of reciprocal motion, and in area of stroke of continuous flow pistons on surfaces of cylinder and the body openings are provided, to those sleeves are installed, those connect the suction chamber between the movable continuous flow pistons to environment. |
