Title: AV-1 alarm valve.pdf
For variable pressure systems, slow as well as small transient increases in water supply pressure may continue to build up in the system (via the Bypass Check Valve) without opening the Waterway Clapper.A transient surge in supply pres- sure that is sufficient only to open the Waterway Clapper momentarily will not cause a false alarm, and a portion of the increase in pressure will be trapped within the system, thus reducing the possibility of another opening. Any water in the alarm line is automatically drained, further reducing the possibil- ity of a false alarm due to a successive transient surge in supply pressure.Design Criteria In planning installation of the TYCO Model AV-1-300 Alarm Check Valves, consideration must be given to the dis- posal of the large quantities of water that may be associated with draining the system or performing a flow test.WATERFLOW PRESSURE ALARM SWITCHRETARD CHAMBERRESTRICTION ASSEMBLY