| 摘要 |
<p>The oil return valve (1) fits in an oil drilling in the housing of a hydraulic jack's hydraulic system between an inner oil cylinder and outer oil cylinder, and controls the flow speed of the return oil between the cylinders. The valve has a male thread which screws into a female thread in the housing, and has a point at the front end supported in the oil drilling and forming with the periphery of the drilling a peripheral oil passage between the outer and inner cylinders. The oil passage is altered by the turning of the oil return valve forwards or backwards in the female thread.</p> |
