| 摘要 |
<p>PURPOSE:To eliminate concerns such as impossible air venting due to normally circulatory connection for excess liquid, making an effective use of excess liquid from a pressure regulating valve in a piston pump. CONSTITUTION:A switching valve 74 performs switching between the first position for connecting the suction port 48 and the excess liquid port 66 of a piston pump respectively with a suction hose 80 and an excess liquid hose 82, and the second position for connecting the suction port 48 with both the suction hose 80 and the excess liquid port 66.</p> |
