Forede 8inch Flange End Wet Type Alarm Valve for Fire Sprinkler System

• Customization: Available
• Alarm Valve Type: Wet Alarm Valve
• Automatically Opened and Closed Repeatedly: Can't Automatically Opened and Closed
• Model NO.: S-ZSFZ200-1.6
• Closed Fire Sprinkler System: Wet Fire Sprinkler System
• Wet Alarm Valve Structure: Seat Type
• Alarm Valve Diameter: 50mm
• Body Material: Ductile Iron
• Pipe Material: SS304 Stainless Steel Pipe
• Water Motor Gong Material: Carbon Steel
• Retard Chamber: SS304 Stainless Steel
• Transport Package: Wooden Packing
• Specification: 60*45*48 cm
• Trademark: forede
• Origin: China
• Production Capacity: 50000 PCS /Year

Product Description

Product Description

forede Alarm Check Valve
The wet alarm valve is a one-way valve that only allows water to flow into the sprinkler system in one direction and alarms at a specified flow rate. The wet alarm valve usually equals the water pressure before and after the valve disc (the water passes through the water pressure balance hole in the guide pipe to keep the water pressure balance before and after the valve disc).

Product Parameters

 

Body Material	Ductile Iron, QT450
Pipe Material	Stainless Steel 304
Ball Valve Material	Stainless Steel 304
Water Gong Material	Carbon Steel
Retard Chamber Material	Stainless Steel 304
End Connections	Flange
Flange Standard	GB / BS Standard
Valve Type	Alarm Check Valve
Working Pressure	1.6 Mpa
Size	DN50,DN65,DN80,DN100,DN125,DN150,DN200,DN250,DN300

 

Dimension

Packaging & Shipping

 

FAQ

1. Drainage Maintenance for Retard Chamber

Q: Over time, stagnant water in the Carbon Steel Retard Chamber may accumulate debris. How to safely drain and clean it without disrupting the entire system?
A: Close the isolation valves upstream/downstream of the ZSFZ valve. Open the retard chamber's dedicated drain valve (usually a ¼" NPT port) to release water. For deep cleaning, disconnect the chamber temporarily, flush with low - pressure water (≤8 bar), and reinstall with new gaskets.

2. Dual Anti - False - Alarm Mechanisms

Q: Beyond the retard chamber, what other design features prevent the Water Motor Gong from false activation?
A: The valve incorporates a pressure - sensitive diaphragm in the flow path-only sustained flow (exceeding 15L/min) flexes it to trigger the gong. Additionally, the gong's internal gear system has a minimum - torque threshold, ignoring minor water surges caused by pipe vibrations.

3. Flange Gasket Compatibility Nuances

Q: For BS4504 - specified flanges, what gasket material is recommended, and how does it differ from ANSI - flange gaskets?
A: BS4504 flanges typically use spiral - wound gaskets (316L stainless steel + graphite) for PN16 pressure. ANSI flanges may require ring - type joint gaskets for higher pressure ratings. Always match the gasket's pressure class (≥PN16) and material (corrosion - resistant) to the valve's working conditions.

4. Water - Saving Flow Simulation for Testing

Q: During commissioning, how to simulate water flow to test the alarm without wasting large volumes of water?
A: Use a low - flow test pump (connect to the valve's test port) to generate 20-30L/min flow-enough to activate the flow switch and gong. For realism, mix a small amount of colored dye in the test water to visualize flow paths without flooding the system.

5. Sequencing with Wet Alarm Valves

Q: When the ZSFZ valve is installed in series with a wet alarm valve, how to coordinate their activation to avoid pressure conflicts?
A: Program the ZSFZ's flow switch to trigger 5 seconds before the wet alarm valve's differential pressure switch. This staggered activation ensures the ZSFZ primes the line first, reducing pressure spikes when the wet valve opens. Use a PLC to synchronize their control signals.