AV-1 Wet Alarm Control Valve Tyco Alarm Valve Trim
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- Model NO.: AV-1-300
- Media: Water
- Connection Mode: Flange
- Material: Ductile Iron
- Trademark: Tycco
- Specification: ductie iron
- Certification: FM UL
- Standard: Standard
- Power: Hydraulic
- Type: Self-Operated
- Transport Package: Packing Export Standard
- Origin: China
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
Weights Refer to Table A.
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.
When the fire protection system is initially pressurized, water flows into the system until the water supply and system pressure become equalized, and the torsion Spring closes the Waterway Clapper in the Alarm Check Valve. Once the pressures stabilize, the Alarm Check Valve is in service and the centrally located groove in the Seat Ring is sealed. Consequently, with the Alarm Check Valve set for service, there is no flow through the alarm port to the alarm devices (i.e., water motor alarm and/or pressure alarm switch). When there is a steady flow of water into the sprinkler system due to a sprinkler operation, the Waterway Clapper opens as shown in Figure 2. Water is then permitted to flow into the centrally located groove in the Seat Ring and out through the alarm port towards the Restriction Assembly (Figure 3). When the flow through the Inlet Restriction of the Restriction Assembly exceeds the flow through the Outlet Restriction, the Retard Chamber (where provided for systems with variable pressure), begins to fill. Subsequently, the Water Motor Alarm and/or the pressure alarm switch will be actuated. The alarms will continue to be actuated as long as the Waterway Clapper remains open. Water in the alarm lines will automatically drain out through the 1/8 inch (3,2 mm) Drain Orifice in the Restriction Assembly (Figure 3) when the Waterway Clapper closes (due to a stop in the flow of water into the sprinkler system). 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 pressure 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 possibility of a false alarm due to a successive transient surge in supply pressure.