Alarm Check Valve

1.Alarm Check Valve serves as a check valve by trapping pressurized water above the clapper and preventing reverse flow from sprinkler piping. The valve is designed to initiate an alarm during a sustained flow of water (such as the flow required by an open sprinkler) by operating an optional water motor alarm and/or alarm pressure switch. Alarm Check Valve is a double seated clapper check valve with grooved seat design, which ensures positive water flow for alarm operation and is designed for installation in wet pipe sprinkler system. External bypass prevents false alarm under all supply pressure condition. In the event of variable pressure condition, false alarms are prevented with the provision of retard chamber, thus the design allows for installation under both variable and constant supply pressure condition. Operation of one or more automatic fie sprinklers, the water flows into the sprinkler system and the alarm valve opens, allowing continuous flow of water into the system and transmittal of alarm, both electrical and mechanical.
2.Retarding Chamber
Retarding Chamber is used with Alarm Valve Trim when variable pressure is anticipated in the system.It is a holding tank to prevent activation of the Sprinkler Alarm during water pressure surge, but permits the activation of alarm on sustained flow. When the flow through inlet of Restriction Nozzle exceeds the drain nozzle flow, the Retarding Chamber begins to fil and there by flowing to sprinkler alarm and pressure switch to activate the alarm. Use of Retarding Chamber prevents the false alarm in variable pressure system.
3.Alarm Bell
Sprinkler Alarm is a hydraulically driven mechanical bell. It does sound a continuous alarm when the sprinkler system operates. The impeller and drive shaft are energy effiient, made from light weight nonmetallic material and do not require any external lubrication. The gong, protection cover and motor housing are made of corrosion resistant aluminium alloy. When the sprinkler system is activated by the fusing of one or more automatic sprinklers at fie condition, the water flows
through the Alarm Valve/Deluge Valve and enters the sprinkler alarm through the nozzle, creating a high velocity jet which strikes the impeller causing the drive shaft and the striker arm assembly to rotate. The alarm arm assembly rotates and strikes to impact against the aluminium gong, producing a continuous alarm. The waste water then drains out through a 25NB drain outlet.

Стандарт фланца

ASME/ANSI B16.1Class 125or ASME/ANSI B16.42 Class 150 or BS EN1092-2 P N 16 or GB/T9113.1

Groove standard

AWWA C606/ISO 6182-12

Notice

1.Installation Height of the Gong Acccrcing to Client's requirenments
2.Gong can be Installed indoor or outdoor through wall as to client's requirements
3.External Dimensions for reference only
4.Coating details, Epoxy coated interior and exterior by Electrostatic Spray or Coating upon request
5.Alarm check valves use in wet pipe of sprinkler system, Fire protection system