| 摘要 |
PURPOSE:To prevent leakage of pressure water as well as the reversing of the same by a method wherein the path surface of an operating surface, whereat an operating stroke is changed into a returning stroke, is provided with a section having no inclination. CONSTITUTION:The path surface of the operating surface 9, whereat the operating stroke is changed into the returning stroke, is provided with a section having no inclination and when the tip end of a piston under the returning stroke has arrived at the section of the operating surface 9, discharge of a cylinder 4 is intercepted immediately. Subsequently, operating pressure water is poured. According to this method the leakage and reversing of the pressure water may be prevented and, further, the piston, having a normal load, is guided to the starting point of the operating stroke.
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