| 摘要 |
<p>PURPOSE:To prevent defectives such as chattering by effects of air and perform a stable relief action by connecting a relief hole of a relief valve with the suction side of a pump through an end chamber of a valve hole. CONSTITUTION:A relief hole 40 is opened along the radius in a valve hole 31 at a close position to a valve seat 33, this relief hole 40 is connected with an end chamber 31a of the valve hole 31 where a spring 38 is inserted through a connection passage 41, and this end chamber 31a is connected with a suction port 20 through a connection passage 42. In this constitution, relief oil is relieved to the suction side through the relief hole 40, the connection passage 41, the end chamber 31a of the valve hole 31, and the connection passage 42 at the time of relieving pressure oil, so if air is penetrated into the valve hole 31 at the time of assembling the relief valve, the air is pushed out of the valve hole 31 by the relief action to prevent its stay in the valve hole 31. Defectives such as chattering by effects of air can thus be prevented, and stable relief action can be performed.</p> |
