| 摘要 |
<p>PURPOSE: To maximize a regeneration effect by providing a regeneration passage communicating with actuator ports in each section and under leads to supply oil to a supply side of an actuator and return oil from a delivery side to a tank. CONSTITUTION: Oil returning from an actuator 3 on the return side of an actuator A returns partly to a tank T through delivery holes 14 and 15, and the remaining overcomes the elastic force of a pressure setting spring 13 for a check valve 12 to move the check valve 12 downward so as to open a regeneration passage 11, and then is regenerated to an actuator port 3' through the regeneration passage 11. When a return pressure in the actuator port 3 is not sufficient, the check valve 12 cannot be moved and, therefore, regeneration does not occur. Because a size is not increased and a separate regeneration passage is formed, a configuration to provide a regeneration function is simplified, production cost is saved, and regeneration effect can be maximized.</p> |
