Products Description
Overview
Sprinkler alarm check valve (wet alarm check valve) is a core control valve for wet‑pipe fire sprinkler systems, the most common automatic fire‑fighting system in commercial buildings, warehouses, and marine vessels.
It combines two main functions in one unit: check valve (non‑return function) plus alarm triggering function.
function
It keeps water pressurized inside the sprinkler piping. It prevents reverse water flow back to the water supply source. Water can only flow forward toward sprinkler heads.
Products Specifications
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Specification |
ZSFZ-Wet Alarm Valve Assembly |
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3" |
4" |
5" |
6" |
8" |
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Rated Operation Pressure |
1.6Mpa |
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Application Medium |
Water, Foam mixture |
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Connection Type |
Flange End |
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Body Material |
Ductile Iron |
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Installation |
Vertical |
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Flange Standard |
BS4504 |
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FAQ
Q: What system does an alarm check valve work for?
It is exclusively designed for wet‑pipe sprinkler systems, where pipes are permanently filled with pressurized water. It cannot be used for deluge, dry‑pipe or pre‑action sprinkler systems.
Q: What are the main parts of a complete alarm check valve assembly?
A full trim set includes:
‑ Alarm check valve body
‑ Retard chamber
‑ Inlet & outlet pressure gauges
‑ Pressure switch
‑ Water motor alarm gong (hydraulic bell)
‑ Test valve, drain valve, bypass valves and associated piping trim
Q: What are common size and pressure ratings?
Standard sizes: 2", 2‑1/2", 3", 4", 5", 6", 8" (DN50‑DN200).
Normal working pressure: 175 psi (12 bar); hydrostatic test pressure 350 psi.
Q: What end connection types are available?
‑ Grooved end (for grooved pipe coupling, widely used in building projects)
‑ Flanged end ANSI B16.5
‑ Threaded end: NPT / BSPP female thread for small sizes.