Alarm Valves
HD alarm valves act as a check valves by trapping pressurized water above the clapper and preventing reverse flow from sprinkler piping. Alarm valves are designed to initiate an alarm through water motor gong bell and/or pressure switch during a sustained flow of water (such as the flow required by an open sprinkler). HD alarm valves are UL Listed and FM approved. Alarm valves are available with trims consisting of retarding chamber and water motor gong bell. Please refer to product catalogues for approval information, technical specifications and ordering information.
Alarm Valve Model H
Description
  • Ductile Iron material to ASTM - A536
  • Flanged x Flanged, Grooved x Grooved and Grooved x Flanged available
  • Rated for maximum 17.5 Bar (250 PSI) operating pressure
  • Size: 80, 100, 150 and 200 NB
  • Variable Pressure Trim with Retard Chamber and Water Motor Gong
  • Constant Pressure Trim available as an option
  • Epoxy painted internally & externally
  • UL Listed and FM Approved
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Alarm Valve Model H
Water Motor Gong Bell
Description
  • Hydraulically operated mechanical bell used along with fire protection system valves
  • Corrosion resistant Aluminium alloy material, epoxy coated all over
  • Wall mounted or direct online mounting type
  • UL Listed and FM Approved
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Water Motor Gong Bell
Retard Chamber
Description
  • HD Retarding Chamber is used with Alarm Valve Trim when variable pressure is anticipated in the system. It is a holding tank to prevent sounding of Sprinkler Alarm during water pressure surge
  • Material Stainless Steel
  • 1 Gallon (3.8 Liter) Capacity
  • Connection N 3/4" BSPT (F)
  • UL Listed and FM Approved
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Retard Chamber