In the central de-energized position. Flow is allowed from inlet port 3 to port 1 and ports 2 and 4 are blocked. When solenoid 'B' is energized flow is allowed from port 3 to 4 and port 2 to 1. When solenoid 'A' is energized flow is allowed from port 3 to port 2 and from port 4 to port 1.
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