Forede 2.5inch Flange Alarm Check Valve with Stainless Steel Pipe

• Customization: Available
• Alarm Valve Type: Wet Alarm Valve
• Automatically Opened and Closed Repeatedly: Can't Automatically Opened and Closed
• Model NO.: S-ZSFZ 65-1.6
• 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

 

FAQ

1. Corrosion Resistance in Seawater-Proximity Installations

Q: In coastal buildings (e.g., seaside hotels) where pipes may contact salt spray, what material modifications are needed for ZSFZ valves to resist corrosion?
A: Replace standard carbon steel components with 316L stainless steel (valve body, retard chamber) and EPDM gaskets (resistant to salt degradation). Apply a 200μm thick epoxy coating to external surfaces, and specify flanges with a "marine grade" finish (ASTM A182 F316).

2. High-Temperature Environment Performance

Q: In boiler rooms or industrial furnaces (ambient temps up to 80°C), how to prevent ZSFZ valve seals from hardening or failing?
A: Use silicone-based O-rings (rated for -60°C to 200°C) instead of nitrile rubber. Install a heat shield (aluminum alloy) around the valve to reduce direct heat exposure. Mount the retard chamber 1.5m+ away from heat sources, and add a thermal insulation sleeve (fiberglass with silicone coating) to its piping.

3. Coordination with Outdoor Hydrant Systems

Q: When ZSFZ valves connect to outdoor fire hydrants, how to balance pressure between the indoor wet system and hydrant flow to avoid underperformance?
A: Install a pressure reducing valve (PRV) on the hydrant branch, set to 1.2x the ZSFZ valve's operating pressure (e.g., 1.6MPa if ZSFZ uses 1.3MPa). Add a check valve between the systems to prevent hydrant flow from siphoning water away from the indoor loop.

4. Recommissioning After Long-Term Shutdown

Q: If a building is vacant for 2+ years (e.g., unoccupied construction projects), what steps are needed to safely restart the ZSFZ system?
A: 1. Flush the entire pipe network with 50ppm chlorine solution to remove stagnant water biofilm. 2. Disassemble the retard chamber, clean its orifices with a soft brush, and replace the diaphragm (even if undamaged, rubber degrades over time). 3. Perform a 30-minute pressure test (1.5x working pressure) to check for leaks before reactivating alarms.

5. Environmental Compliance for Scrap Valves

Q: When replacing old ZSFZ valves, how to ensure disposal meets EU RoHS or US EPA standards for hazardous materials?
A: Dismantle the valve to separate materials: recycle 316L stainless steel components as scrap metal; incinerate rubber seals (certified for low VOC emissions); neutralize any residual hydraulic fluid (use absorbent pads compliant with EPA 40 CFR Part 261) before disposal. For leaded brass parts (if present in older models), send to a licensed hazardous waste recycler.

Packaging & Shipping