Patent ID: 7383892

Claim:
An fire protection system comprising: sprinkler piping system with at least one sprinkler head assembly; a water supply system; a check valve having a water supply inlet and an outlet, said outlet of said check valve in fluid communication with said sprinkler piping system, and said water supply inlet in selective fluid communication with said water supply system; a fire suppression solution supply system in fluid communication with said sprinkler piping system, said check valve isolating said fire suppression solution from said water supply unless a fire condition occurs; a pressure detector detecting the pressure of the fire suppression solution in said sprinkler piping system; a flow detector detecting the flow of water from said water supply system; and a control in communication with said flow detector and said pressure detector, said control controlling the flow of said fire suppression solution to said sprinkler piping system and maintaining the pressure of said fire suppression solution in said sprinkler piping system unless said flow detector detects the flow of water from said water supply system in which case said control stops the flow of fire suppression solution to said sprinkler piping system to limit the discharge of fire suppression solution from the fire protection system.