| 摘要 |
PURPOSE:To simplify the constitution in the whole unit of a control device further form it in a small size, by connecting a pilot chamber in a control valve with a main line through a selector valve switched by the pressure in the main line. CONSTITUTION:A pilot chamber 8a, 8b in a control valve 8, actuated by the pilot pressure from a pilot valve 4, is connected with a main line A, B through a selector valve 11a, 11b switched by the pressure in the main line A, B. In this way, the whole unit of a control device is formed in simplified constitution and in a small size by enabling the brake action to be generated without causing the necessity for using a counterbalance valve because the pilot pressure in the control valve 8 decreases in accordance with the line pressure by switching the selector valve 11a, 11b to be placed in a conductive condition when the line pressure of an oil hydraulic motor 2 comes to be in a level of the preset value or less. |
