| 摘要 |
<p>An improved structure a control valve for a power steering gear includes a valve sleeve having a plurality of lands and a valve core rotatable within the valve sleeve and having a plurality of lands. At least one land of the valve core and at least a pair of lands of the valve sleeve located on opposite sides of the land of the valve core have surfaces which cooperate with one another during rotation to produce a first constricting orifice at the beginning of rotation and a second constricting orifice at the maximum amount of rotation. The size of the second constricting orifice being greater than the size of the first constricting orifice.</p> |
