Solenoid Valves are two-way, pilot operated valves that are listed/approved releasing devices for Ag Fire Sprinkler Deluge and Preaction Systems utilizing electric detection. The solenoid valves are used in conjunction with a listed/approved releasing control panel, operated by listed/approved electric heat or smoke detectors. The releasing control panel must have a supervised releasing circuit and back up batteries (60 hour for UL and 90 Hour for FM compliance). The system will not operate with a total loss of power so inspection and Maintenance of the battery charging function of the control panel is required.