Production introduction
The Sprinkler System Alarm Check Valve is a critical component in automatic fire sprinkler systems, serving as a dual-function device that ensures both unidirectional water flow and reliable alarm activation. This valve is engineered to prevent backflow of water, protect the water supply system from contamination, and trigger alarms during fire emergencies, thereby enhancing the overall safety and efficiency of fire protection mechanisms.
The Alarm Check Valve operates as a check valve, allowing water to flow solely from the supply side to the system side while blocking reverse flow. This unidirectional flow is crucial for maintaining system integrity and preventing contamination of potable water sources. In addition to its check valve functionality, the device incorporates an alarm mechanism that activates when water flows at a rate equivalent to the discharge of one or more sprinklers. This dual-purpose design ensures immediate detection of fire incidents and prompt notification of emergency responders.
Structurally, the valve is divided into two chambers by a movable disc or diaphragm. The upper chamber connects to the system pipeline, while the lower chamber interfaces with the water supply. Under normal conditions, the pressure differential between the chambers keeps the disc sealed, preventing water flow. When a fire triggers sprinkler activation, the pressure in the system chamber drops, causing the disc to lift and allow water to pass through. Simultaneously, a portion of the water is diverted to an alarm circuit, activating sounders (such as water motor gongs) and electrical alarms via pressure switches.
Product specification
|
Specification |
ZSFZ-Sprinkler System Alarm Check Valve |
||||
|
3" |
4" |
5" |
6" |
8" |
|
|
Rated Operation Pressure |
1.6Mpa |
||||
|
Application Medium |
Water ,Foam mixture |
||||
|
Connection Type |
Flange End |
||||
|
Body Material |
Ductile Iron |
||||
|
Installation |
Vertical |
||||
|
Flange Standard |
BS4504 |
||||
FAQ
Q: What is the primary function of a sprinkler system alarm check valve?
A: It ensures unidirectional water flow and activates alarms during system discharge, preventing backflow and contamination.
Q: What materials are commonly used in its construction?
A: Valve bodies are typically ductile iron or stainless steel; internal components like discs use bronze or EPDM rubber for durability and corrosion resistance.
Q: What nominal diameters are available?
A: Common sizes range from 80 mm to 250 mm, accommodating diverse piping systems.
Q: How does the valve prevent false alarms?
A: A retard chamber delays water flow to the alarm circuit, filtering out transient pressure surges (e.g., from water hammer).
Q: How does a water motor gong operate?
A: Water flow drives a turbine connected to a bell, producing an audible alarm without external power.