Patent ID: 7530402
Filing Date: 2009-05-12
Classification: A62C,F16K

Abstract:
1. A water column supervisory switch in combination with a sprinkler system comprising: a valve casing defining a chamber and a valve seat that divides the chamber into a upstream side in communication with a water supply and a downstream side in communication with a plurality of sprinklers, a clapper valve arrangement comprising a clapper body adapted to engage the valve seat and being operable between a normally-closed position wherein fluid flow communication is prevented between the upstream and the downstream side, and a fully open position wherein fluid flow communication is permitted between the upstream and the downstream side, the chamber being in communication with a conduit defined by a stack, and a probe arrangement operatively associated with the stack, the probe arrangement being positioned at a predetermined level along the stack relative to the clapper valve body, and including a probe; the probe including: wherein an alarm is activated when the conductive medium in the stack contacts the probe arrangement at the predetermined level.