Sprinklers & Alarm Valves

Wet Alarm Check Valve ZSFZ 150

ZSFZ Wet Alarm Check Valve is a key component of automatic sprinkler systems. It automatically sounds the hydraulic alarm gong and triggers the pressure switch when water flows to the sprinklers.

Key Features

High-strength cast iron structure for heavy-duty firefighting
Highly sensitive clapper ensures immediate alarm response
Equipped with water motor alarm gong and retard chamber to prevent false alarms
Easy on-line maintenance and testing

Technical Specifications

Nominal Diameter: DN100 / DN150 / DN200
Nominal Pressure: 1.6 MPa
Standard: GB5135.2 / Factory Standard
Body Material: Cast Iron / Ductile Iron
Accessory: Pressure Switch, Delay Chamber, Gong

Parts & Materials List

Valve Body: Cast Iron / Spheroidal Graphite Iron
Clapper/Seat Seal: EPDM / NBR High Durability Rubber
Retard Chamber: Cast Iron / Brass
Alarm Gong: Aluminum Alloy / Copper
Fittings & Pipes: Galvanized Steel / Brass

Applications

Automatic sprinkler systems
Commercial and residential buildings
Industrial warehouses
High-hazard deluge and pre-action systems

Quality & Testing

Pressure and leakage testing per GB 5135 series; alarm sensitivity verified with flow switches and alarm gongs.

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Frequently Asked Questions

How does the ZSFZ wet alarm valve sound the alarm?

When sprinkler flow opens the clapper, the water motor alarm gong is driven continuously, the retard chamber filters out transient surges to prevent false alarms, and the pressure switch closes an electrical contact to the fire alarm control panel.

Does the ZSFZ need electrical power to operate?

No. The valve itself is fully hydraulic; only the pressure switch contact provides the alarm signal to the building fire alarm panel.

What sizes are available for the ZSFZ?

DN100, DN150 and DN200 at 1.6 MPa nominal pressure, manufactured to GB 5135.2 with cast iron or ductile iron bodies and EPDM/NBR clapper and seat seals.

Can the ZSFZ be maintained without draining the system?

Yes — it is designed for on-line maintenance and periodic testing, which is critical for fire systems that must remain protected around the clock.