Wet Type Fire Alarm Check Valve (Wet Alarm Valve Set)
The wet type fire alarm check valve, installed on sprinkler risers, combines a check valve, retard chamber, water-motor gong, pressure switch, and dual gauges. When a sprinkler activates, the clapper opens, sending water to the pipe network and alarm line, triggering mechanical and electrical alarms. Sizes DN80–DN300, 1.6MPa, GB 5135.2 compliant, suitable for commercial and industrial buildings.
Description
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Products Description
Wet Type Fire
Alarm Check Valve
Fire Protection Equipment / Sprinkler System Devices
A single-source hydraulic switch and alarm assembly for wet-pipe automatic sprinkler systems. The valve holds pressurised water on standby, then confirms every discharge with a mechanical gong and an electrical signal - no external power required to sound the first alarm.
DN80 – DN300
PN1.6 MPa
GB 5135.2
Groove & Flange Ends
Ductile Iron Body
OVERVIEW
The wet type fire alarm check valve (also known as a wet alarm valve set) is installed at the riser of a wet-pipe automatic sprinkler system, where the system side of the pipework is permanently charged with pressurised water. When a sprinkler head opens in a fire, the resulting pressure drop lifts the valve clapper, allowing water to flow both into the protected area and through a dedicated alarm line. That alarm line drives a water-motor gong for a purely hydraulic, power-independent local alarm, while a pressure switch closes a circuit to transmit a signal to the fire alarm control panel. A retard chamber absorbs momentary pressure surges caused by supply-side fluctuations, preventing false alarms from transient pressure noise. The assembly is supplied as a complete package - check valve body, retard chamber, water-motor alarm, pressure switch, drain and test valves, and inlet/outlet pressure gauges - ready for installation on the riser.
Key Features
Dual-Path Alarm
Simultaneous mechanical (water-motor gong) and electrical (pressure switch) alarm outputs, so a signal reaches both the building occupants and the fire control room.
Retard Chamber
Filters out short-duration pressure surges from the water supply, reducing nuisance alarms without delaying a genuine fire signal.
Dual Pressure Gauges
Independent gauges on the supply and system sides give an immediate visual check of standby pressure and clapper seating.
Ductile Iron Construction
Body and cover cast in ductile iron with corrosion-resistant coating, rated for a nominal working pressure of 1.6 MPa and tested to 3.2 MPa.
Flanged or Grooved Ends
Manufactured to GB/T 1724.6 flange dimensions, with grooved-end variants available for faster site coupling.
Integrated Test & Drain
Built-in main drain and alarm test valves allow routine functional testing without disturbing the wider sprinkler network.
How It Works
1 Standby
Clapper stays seated by system pressure; supply and system gauges read equally.
2 Head Opens
A sprinkler activates; system-side pressure falls below supply pressure.
3 Clapper Lifts
Water flows into the sprinkler main and into the alarm line simultaneously.
4 Retard & Confirm
The retard chamber fills first, screening out transient surges before alarming.
5 Alarm
Water-motor gong sounds locally; pressure switch signals the control panel.
Technical Specifications
Design, manufacture and testing basis, and full dimensional data across the DN80–DN300 range (standard flanged series) and the 100(G)–250(G) grooved-end series. All dimensions in millimetres unless noted.
| DN | h | H | A | B | M | N | D1 | n-D | C |
|---|---|---|---|---|---|---|---|---|---|
| 80 | 230 | 530 | 180 | 250 | 110 | 150 | 160 | 8-18 | / |
| 100 | 260 | 540 | 190 | 260 | 120 | 150 | 180 | 8-18 | / |
| 125 | 275 | 540 | 200 | 270 | 130 | 160 | 210 | 8-18 | / |
| 150 | 305 | 540 | 205 | 275 | 142.5 | 180 | 240 | 8-22 | / |
| 200 | 375 | 540 | 235 | 310 | 175 | 205 | 295 | 12-22 | / |
| 250 | 470 | 555 | 260 | 330 | 215 | 230 | 355 | 12-28 | / |
| 300 | 560 | 580 | 290 | 365 | 255 | 250 | 410 | 12-28 | / |
| 100(G) | 250 | 540 | 190 | 260 | 100 | 150 | / | / | 114.3 |
| 150(G) | 305 | 545 | 245 | 285 | 140 | 150 | / | / | 165.1 |
| 200(G) | 330 | 555 | 245 | 300 | 145 | 150 | / | / | 219.1 |
| 250(G) | 420 | 555 | 300 | 310 | 220 | 220 | / | / | 273.0 |
(G) - grooved-end series, dimension C denotes pipe outer diameter at the groove. Contact our engineering team for certified dimensional drawings.
Applications
Commercial Buildings
Offices, hotels, and retail centres protected by wet-pipe sprinkler risers.
01
Industrial Facilities
Factories and warehouses with continuously heated or frost-free pipework.
02
Residential Towers
High-rise standpipe and sprinkler risers requiring floor-by-floor alarm zoning.
03
Car Parks & Basements
Enclosed spaces where an audible local alarm supports early evacuation.
04
FAQ
Q: What's the difference between DN and DN(G) models?
A: DN models use flanged ends per GB/T 1724.6; DN(G) models use grooved ends for faster mechanical coupling on site. Both share the same internal working principle.
Q: Does the alarm work without electricity?
A: Yes. The water-motor gong is driven purely by water flow. The pressure switch adds an electrical signal to the control panel but isn't required for the local audible alarm.
Q: Why is a retard chamber needed?
A: It absorbs brief pressure surges from the water supply so normal fluctuations don't trigger a false alarm, while still allowing a genuine flow event to alarm promptly.
Q: How is the valve tested after installation?
A: Open the built-in alarm test valve to simulate flow and confirm the gong and pressure switch both activate, without draining the full sprinkler system.
Q: What sizes and pressure ratings are available?
A: DN80 through DN300 (plus 100(G)–250(G) grooved sizes), all rated at 1.6 MPa nominal working pressure with a 3.2 MPa seal test pressure.
Our address
NO.8, YUANFENG ROAD, MEIYUAN VILLAGE, KANGMEI TOWN, NANAN CITY, QUANZHOU CITY, FUJIAN CHINA
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