| 摘要 |
A single acting, piston type pump comprises a pair of cylinders, and a pair of pistons mounted in respective cylinders for reciprocal movement within the cylinders. The pistons are interconnected with one another so that while one piston is moving upward in its cylinder, the opposing piston is moving downward. An inlet line and an outlet line is connected with the active end of each cylinder for drawing fluid into the active chamber when the piston moves upwardly, and expelling fluid through the outlet line when the piston moves downwardly in the cylinder. A cross-over channel is connected between the passive chambers of the cylinders so that the effective volume of the passive chambers remain constant as the pistons reciprocate within the cylinders. Because the volume of the passive chambers remain unchanged, there is less pressure on the seals surrounding the piston rods and a decreased likelihood of leakage.
|
