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Dry Check Valve Systems are specified where exposed piping might freeze. In a dry system the piping between the valve and sprinklers is filled with pressurized air or nitrogen rather than water.
A sprinkler head opening causes air pressure to drop. When the pressure deteriorates in the pipes sufficiently, the valve clapper is allowed to open, flooding the lines with water.
An accelerator and anti-flood device can be added to the system to speed the valve opening in large systems. The water flow can also trip an electric or water motor alarm to alert occupants.
The Victaulic FireLock NXT Series 768 dry valve offers the smallest installation profile in the industry and a consistent 13psi/0.9BAR pressure requirement, regardless of system size. |