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When battery voltage is insufficient for reliable pump restart (below 12.25V) or intermittent cycle timing is too rapid for pump cycling, this valve switches to A-C position, diverting flow through a DN20 recirculation pipe that returns water to the tank via an inlet at the tank top.
This enables intermittent sprinkler operation by cycling the valve while leaving the pump running continuously, conserving battery power that would otherwise be consumed by repeated electric starter activation.
All the remotely operated valves are powered at 12V DC power from the shed battery, and are controlled via Songle SRD-05VDC-SL-C relays receiving 5V logic signals from the Arduino control systems. The three-wire control scheme for motorized ball valves (common, normally-open, and normally-closed terminals) allows each valve to fail in a predictable default position if power is lost, generally configured to maintain system safety: flow valve defaults to reduced flow, shed cooling defaults to off (conserving water), and recirculation valve defaults to sprinkler delivery.
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