Alarm Valve DN200 - 8in FG.jpg DN200 Wet Alarm Valve, LPCB Trim,FG 1.jpg DN100 Body FG.jpg

Model D Wet Alarm Valve (Flange / Groove)

  • FM Approved Logo Mid Grey 300.jpg
  • UL Logo Mid Grey.jpg
  • LPCB Logo Mid grey 556b-02.jpg
  • CE Logo Mid Grey 144.jpg
  • UKCA black Mid Gray.jpg
Size range 100mm (4")
150mm (6")
200mm (8")
Body type Flange / Groove
Working pressure 12 bar (175 psi)
Body Material Cast Iron
Approvals FM, UL, LPCB, CE, UKCA

Rapidrop Model D 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 D


DN100/4” 263 22.7

- PN16 (hole drilling pattern)

- DN100/4”: 114.3 OD
- DN150/6”: 165.1 OD (UK)
- DN150/6”: 168.3 OD
- DN200/8”:  219.1 OD

DN150/6” 280 29.5
DN200/8” 335 56.8

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

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 1 1
Clapper Gasket 1 1
Clapper Bolt 4 5
Clapper Seat Ring 1 1