Graco 25V482 Instructions Manual page 6

Overview
Overview
Air Control Solenoid Valves
Air control solenoid valves are a Fluid Defender system
component used to control air operated pumps and air
actuated control valves. These devices are used to stop
fluid flow into the monitored tank. They are an optional
system component, but required for fluid flow
interruption.
The air control solenoid valves are continuously
powered during normal operation with the air control
solenoid valve being open to provide air pressure to the
controlled equipment.
When the Fluid Defender detects an alarm condition in
the same channel as the air control solenoid valve, the
solenoid is deactivated causing the connected
equipment to deactivate.
The Fluid Defender must be powered for the air control
solenoid valve to be open, allowing for normal
controlled equipment operation. Loss of power to the
Fluid Defender closes the air control solenoid valve and
bleeds downstream air pressure from the controlled
equipment.
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