| 摘要 |
In a plunger pump system of a quick pressure-rise type which is utilized for increasing the pressure of a working fluid to be supplied quickly to a hydraulic actuator, such as an oil hydraulic cylinder, both a high pressure plunger pump and a quick-charging pump are connected interlockingly to one prime mover so as to be driven synchronously. During a low pressure range of operation, a large amount of working fluid delivered from a quick-charging plunger chamber is adapted to be supplied to the hydraulic actuator through a high pressure plunger chamber. On the other hand, during a high pressure range of operation, a small amount of high pressure working fluid is adapted to be delivered from the high pressure plunger chamber to the hydraulic actuator. Under this high pressure delivery condition of a small amount of working fluid, the working fluid is adapted to be controlled by a check valve so as to pass through the quick-charging plunger chamber in the regular direction from the suction side to the delivery side thereof.
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