| 摘要 |
<p>PURPOSE:To make it possible to integrate a booster control valve and a temporary relief valve, which are designed to maintain a PTO clutch, driving a tractor, under a semi-clutching state, and then form them into one control valve body, thereby building the integrated valve body into the above cylinder as required. CONSTITUTION:A gradually increased working oil pressure is supplied into a PTO clutch cylinder 5 through a booster control valve 7 and a temporary relief valve 17 so as to release impact force when driving a tractor or similar equipment having a large inertia. In other words, the pressure oil supplied by an oil pump 1 into a valve chamber of a valve 7 through a switch-over valve 4 is partially released into a valve chamber of a valve 7, when the pressure is increased, thereby prolonging the time when the pressure oil inside a valve chamber 13 is returned, and reducing the pressure rise inside the cylinder 5. With this construction, the valve 7 and the valve 17 are internally built in and formed into one control valve body 23. The valve body 23 is installed to an oil channel 25 of the cylinder 5 in a removable manner.</p> |
