A combined alarm test and drain device for a fire protection sprinkler system is disclosed. The apparatus is based on a globe valve and has certain specific modifications for the purposes of draining the system and allowing for flow through a specifically sized orifice under conditions simulating the...http://www.google.com/patents/US20020083982?utm_source=gb-gplus-sharePatent US20020083982 - Sprinkler alarm test and drainage device for fire protection systems
