Products Introduction
foinbo® Wet Alarm Check Valves are purpose-built hydraulic control components exclusively engineered for wet pipe fire sprinkler systems-where continuous water pressure and instant activation are non-negotiable for life safety. Crafted from high-grade ductile iron with a full-port flow design, these valves span 3" to 8" flange sizes (adhering strictly to BS4504 standards) and operate at a 1.6Mpa rated pressure, ensuring unobstructed water flow to sprinkler heads during emergencies.
Wet Alarm Check Valves feature a dual-function design: they prevent reverse water flow to protect municipal water supplies from system contamination, and their integrated alarm trigger mechanism activates the fire alarm system the moment water begins to move through the pipe-eliminating delays in emergency response for facilities relying on wet pipe setups.
The operational reliability of Wet Alarm Check Valves stems from precision-engineered internal components and adaptive design features. A spring-loaded clapper assembly with a resilient EPDM seat ensures a tight seal under static pressure, preventing slow leaks that could lead to system pressure loss over time. The alarm initiation chamber, paired with a pressure-actuated alarm bell and auxiliary switch, is calibrated to respond to flow rates as low as 1.5 L/s-fast enough to detect the activation of a single sprinkler head, yet robust enough to ignore minor pressure surges. For facilities integrating foam-water suppression into wet pipe systems,
Products Parameters
|
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 |
||||
Products Description
Application Detail
- Hospital Critical Care Wings: In hospitals with wet pipe systems protecting ICUs, operating rooms, and medication storage areas, Wet Alarm Check Valves deliver fail-safe performance. The low-flow activation ensures even a single sprinkler head triggering is detected immediately, alerting staff to evacuate sensitive areas before water damage impacts patient care. The corrosion-resistant coating withstands the humid, sanitized environment of hospital mechanical rooms.
- Retail Supermarket Floor Plans: For large supermarkets with open floor layouts and refrigerated sections, Wet Alarm Check Valves support the high-flow demands of multiple sprinkler heads activating simultaneously (e.g., during a fire in the grocery or electronics aisle). The full-port design ensures water reaches remote sprinkler heads quickly, while the backflow prevention feature keeps potable water supplies safe from any additives in the fire suppression system.
- Warehouse Cold Storage Zones: In temperature-controlled cold storage warehouses (above freezing, maintaining wet pipe eligibility), Wet Alarm Check Valves resist condensation-related corrosion and maintain a tight seal to prevent system freeze-ups. The alarm system's reliability ensures on-site security teams are notified promptly, even in low-activity night shifts, to contain fires before they damage perishable inventory.
FAQs
Q: What is the minimum system pressure required for Wet Alarm Check Valves to activate the alarm reliably?
A: The alarm trigger mechanism activates at a minimum inlet pressure of 0.2Mpa, which aligns with the standard operating pressure of most wet pipe sprinkler systems. This low threshold ensures Wet Alarm Check Valves function effectively even in low-pressure municipal water supply scenarios.
Q: Can Wet Alarm Check Valves be equipped with a pressure relief valve to handle excess system pressure?
A: Yes. Foinbo offers a factory-integrated pressure relief valve accessory that mounts directly to the Wet Alarm Check Valves body, set to open at 1.6Mpa to protect the valve and downstream piping from over-pressurization during system testing or water hammer events.
Q: How is air purged from the alarm chamber of Wet Alarm Check Valves after system maintenance?
A: A dedicated manual air release valve is built into the alarm chamber. Simply open the valve until a steady stream of water flows out (indicating all air is purged), then close it-this simple step ensures Wet Alarm Check Valves register flow accurately for subsequent fire events.
Q: Do Wet Alarm Check Valves require a specific type of alarm bell for optimal performance?
A: They are compatible with standard 24V electric alarm bells and mechanical water motor bells. Foinbo recommends pairing Wet Alarm Check Valves with water motor bells for off-grid facilities, as they operate using water pressure alone, no electrical power required.
Q: What steps are needed to verify the clapper seal integrity of Wet Alarm Check Valves without draining the entire system?
A: Perform a "static leak test" using the valve's built-in test port. Close the main supply valve, open the test port to relieve pressure downstream, then monitor the pressure gauge on the inlet side-if pressure remains stable for 30 minutes, the clapper seal is intact. This non-invasive test preserves system water pressure and minimizes downtime for Wet Alarm Check Valves inspections.