Alarm Valve DN80 - 3in FF.jpg DN150 Wet Alarm Valve, LPCB Trim, FF copy.jpg DN150 Body FF.jpg

Model B Wet Alarm Valve (Flange / Flange)

  • FM Approved Logo Mid Grey 300.jpg
  • UL Logo Mid Grey.jpg
  • LPCB Logo Mid grey 556b-01.jpg
  • CE Logo Mid Grey 144.jpg
  • UKCA black Mid Gray.jpg
  • gost logo 300.jpg
Size range 80mm (3")
100mm (4")
150mm (6")
200mm (8")
Body type Flange / Flange
Working pressure 12 bar (175 psi)
Body material Cast Iron
Approvals FM, UL, LPCB, CE, UKCA, Gost

Rapidrop Model B wet alarm valves are designed for use in wet pipe sprinkler installations in buildings not subject to freezing temperatures.

This type of wet alarm valve is designed to automatically initiate electric or hydraulic alarm whenever there is a flow of water to one or more sprinklers.

A variety of trim packages are available to suit the requirements of the authority having jurisdiction and a number of accessories can be supplied including straps and padlocks, pressure switches, retard chamber and water motor alarm gong.

This valve must be installed vertically in the main supply to a wet pipe sprinkler system.

Dimensions & Weight

Model Sizes Face to Face (mm) Weight (kg) Connection Type

Model B


DN80/3” 273 23.0


- ANSI 125/150
- PN16 (hole drilling pattern)

DN100/4” 225 23.5
DN150/6” 267 35.5
DN200/8”** 298 60.0

*All valves with flange connections are supplied with flat face flanges.

**The PN16 drilling on the top flange of the DN200 size valve is radially off set to the drilling in the bottom flange. This is required to achieve bolt clearance of the body casting and must be taken into consideration in the design of mating flanged pipe work.

Valve Components

Description Qty. DN80 DN100 DN150 Qty. DN200
Valve Body 1 1
Cover Plate Bolt 4 4
Cover Plate  1 1
Cover Plate Gasket 1 1
Clapper Shaft Retaining Plug 2 1
Clapper Shaft 1 1
Clapper 1 1
Clapper Nut 1 5
Clapper Bolt Lock Washer 1 5
Clapper Retainer
Clapper Gasket 1
Clapper Bolt 5
Clapper Seat Ring