| 摘要 |
<p>PURPOSE:To temporarily increase an output without causing an engine stop, by increasing the relief pressure of a main relief valve higher than the rated pressure of a circuit only for a short time. CONSTITUTION:If the pressure in a circuit reaches a rated pressure PA, a control selector valve 17 is selected to a position B, and a piston 16-a is extruded at a speed regulated by a flow control valve 19, then a selector valve 15 is selectively placed from a position B to a position A. However, as the relief pressure of a main relief valve 13 is set to a pressure PC higher than the rated pressure PA in the circuit, the pressure in the circuit is once increased to the relief pressure PC set by the main relief valve 13 during the time before the selector valve 15 is selected after the pressure in the circuit reaches the rated pressure PA. If the selector valve 15 is selected to the position A, the pressure in the circuit is automatically decreased to the rated pressure.</p> |
