| 摘要 |
<p>A directional control valve has three ports with a first fluid path extending between the first and second ports and a second fluid path between the second and third ports. A chamber is defined at an intersection of the first and second fluid paths and contains a spherical valve (16) member disposed between opposed, spaced valve seats (19,20). The valve member is movable across the chamber between the valve seats between an open position in which the valve member is displaced from a first valve seat so that the first fluid path is open and is sealed against a second valve seat so that the second fluid path is closed and a closed position in which the valve member is sealed against the first valve seat so that the first fluid path is closed and displaced from the second valve seat so that the second fluid path is open. The valve member is biased towards the closed position by opposed first and second biasing members (34, 41) of unequal loading. An actuator (32) such as, for example, a solenoid is operable to move the valve member from the closed position to the open position against the unequal loading.</p> |
