| 摘要 |
A spool valve includes a first valve port coupled to a fluid source at a first pressure range, a second valve port coupled to a fluid source at a second, lower, pressure range, and first and second output ports coupled to a hydraulic device. The valve includes a valve spool configured to selectively channel fluid from the first and second valve ports to the first and second output ports, respectively, while in a first position, from the second valve port to both the output ports while in a second position, and from the second and first valve ports to the first and second output ports respectively, while in a third position, and a check valve to permit one-way fluid passage from the second output port to the first valve port. The valve may include an anti-reverse check valve configured to prevent fluid from flowing into the valve via the first output port.
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