| 摘要 |
<p>PURPOSE:To provide higher pressure increasing efficiency by shaping pressure booster chambers at both ends of a booster piston, connecting an operating valve to the booster piston, and having the operating valve control a primary control valve which changes over reciprocating operation of the booster piston. CONSTITUTION:Pressure booster chambers 20 and 21 are shaped at both ends of a booster piston 17. The chambers 20 and 21 are connected to both a hydraulic cylinder 1 via check valves 22 and 23 and a booster piston chamber 16 via check valves 28 and 29. An operating valve 36 is connected to the booster piston 17 and a secondary control valve 48 is controlled by the operating valve 36 via a primary control valve 40. When the booster piston 17 makes a go stroke and a return stroke, pressure boosting parts 18 and 19 actuate to feed high pressure oil inside the pressure boosting chambers 20 and 21 into the cylinder 1. The booster piston 17 can thereby execute pressure boosting operation efficiently and quickly.</p> |
