| 摘要 |
<p>A three-way control valve is described comprising a body member formed with a central axial bore receiving a valve assembly axially displaceable within the bore and including a first valve member adapted to close one end of the bore in one position of the valve assembly, and a second valve member adapted to close the opposite end of the bore in a second position of the valve assembly, to establish selective communication between three ports formed in the body member. The valve assembly is biassed in one position by a spring, and is actuated to its other position by fluid pressure. One application for such a control valve is in a cow milking machine wherein one port is connected to the cow milking cups, the second port is connected to a source of vacuum applied to the milking cups, and the third port is connected to a source of water for washing the milking cups.</p> |
