| 摘要 |
A frame of a reversible plow having plow shares that are directed to the right and to the left. The frame is turned by means of a piston connected to a turning shaft of the frame, the turning of the cylinder being controlled by an automatic reversing valve. The valve has a fixed housing and a movable shaft. Peripheral grooves are present in either the housing or shaft through which hydraulic oil is supplied from one side of the piston to the other side thereof. |
