Sprinklers & Alarm Valves

Pre-action Deluge Alarm System (ZSFY Series)

ZSFY Pre-action Valve combines the advantages of both wet and dry sprinkler systems. The piping remains air-filled under normal status to avoid accidental water leaks, and is flooded rapidly with water upon fire detection.

Key Features

Dual-signal trigger: requires both fire alarm and pressure switch signals to prevent accidental discharge
Perfect for highly critical rooms: libraries, archives, computer labs, and museums
Integrated pressure-maintaining and air-feeding devices
Corrosion resistant brass and stainless steel accessories

Technical Specifications

Size Range: DN80 - DN250
Nominal Pressure: 1.6 MPa
System Side Air Pressure: 0.03 - 0.05 MPa
Trigger Mode: Pneumatic / Electric / Manual
Body Material: Ductile Iron QT450

Parts & Materials List

Body & Bonnet: Ductile Iron (QT450-10)
Internal Clapper: Bronze / Spheroidal Iron EPDM covered
Diaphragm Chamber: Reinforced NBR
Trim Pack: Galvanized Piping / Copper Alloys

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.

Inquire Now Request Product Documentation

Frequently Asked Questions

Why use pre-action for data centers, archives or museums?

The piping stays air-filled (0.03–0.05 MPa) under normal conditions, so an accidental pipe break cannot dump water on the protected assets. Water is released only when the dual-signal trigger confirms a fire.

How does the ZSFY dual-signal trigger prevent accidental discharge?

The valve requires two independent signals — a fire alarm signal and a pressure change — before the diaphragm chamber releases and floods the system. A single malfunction cannot trigger discharge.

What sizes and trigger options are available for the ZSFY?

DN80 to DN250 at 1.6 MPa, with pneumatic, electric or manual trigger options, and integrated pressure-maintaining and air-feeding devices in the group.

What materials make the ZSFY corrosion resistant?

Ductile iron QT450 body and bonnet, EPDM-covered bronze or spheroidal iron clapper, reinforced NBR diaphragm chamber, and brass and stainless steel accessories throughout the trim.