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6. Overall System Diagram
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Figure 1
The ADV consists of a pressure balanced valve which opens periodically to allow fluid from the discharge
line to bypass the discharge check valve and flow back into the pump head. The valve is actuated by a solenoid
controlled by a solid-state timer. The ADV Valve Assembly incorporates a dual sealing design to insure the valve
function even if the Primary Bellows seal fails. The Leak Detection Port (1/8” NPTF) allows visual indication of a
Bellows failure while allowing the ADV to keep functioning. At the discretion of the user, this port may be used to
pipe any leakage to a safe vessel or a leak detection device.
