Description
The UNITED Fire Systems Purge Vent Assembly – Model PVA is a device to purge air from the interior of preaction and deluge sprinkler system piping, allowing a NITROGEN-PAC™ sprinkler corrosion inhibiting system to replace the air with nitrogen. The purge vent assembly is connected to the sprinkler piping in the vicinity of the inspector’s test connection. A float valve prevents the escape of water from the device in the event of opening of the sprinkler valve and filling of the piping with water. A fixed orifice regulates the amount of gas leaving the piping. The purge vent also serves as the connection point for an N2 analyzer to assess the percent nitrogen in the pipe. A drain plug allows periodic draining of accumulated water.

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