AV 1-300
The TYCO Model AV-1-300 Alarm Check Valves are divided seat ring, rubber-faced clapper, waterflow alarm check valves that are intended for use in wet pipe (automatic sprinkler)
fire protection systems. They may be installed vertically or horizontally*, and they are designed to automatically actuate electric and/or hydraulic alarms when there is a steady flow of
water into the system that is equivalent to the discharge rate of one or more sprinklers.

A separately ordered Model RC-1 Retard Chamber (Ref. Technical Data Sheet TFP920) is required for installations subject to variable pressures. It is used to help prevent false alarms associated with pressure variations in public water supplies.

The AV-1-300 Alarm Check Valve Trim includes pressure gauges to monitor system pressure conditions, a bypass check valve, a main drain valve, and an alarm test valve. The bypass check
valve reduces the possibility of false alarms by permitting slow as well as small transient increases in water supply pressure to be passed through to the system without opening the waterway clapper.

Approvals
UL and C-UL Listed
FM Approved
Working Water Pressure Range 20 to 300 psi (1,4 to 20,7 bar)

Friction Loss
Refer to Graph A.
End Connections Groove x Groove
Flange x Groove Flange x Flange
Refer to Table A for size applicability

Physical Characteristics
The body is ductile iron, the hand-hole cover is ductile iron, and the seat ring is bronze. The clapper for the 2-1/2 inch (DN65) valve size is stainless steel.
The clapper for the larger valve sizes is ductile iron. All valve sizes utilize an EPDM clapper facing.
Flanged connections are available drilled per ANSI, ISO, AS, and JIS specifications as detailed in Table B.
Threaded port connections for the AV-1-300 Valves are available NPT threaded or threaded per ISO 7-1 as detailed in the Ordering Procedure section. Valves with NPT threaded ports will readily accept the trim arrangements detailed in Figures 4 through 6.