Deluge Valve

Model: E0302-DH2, E0302-DH3, E0302-DA

Size Range: 2 1/2” (50NB), 3” (80NB), 4” (100NB), 6” (150NB), 8” (200NB)

Service Pressure:
20 to 250 psi for E0302-DH2 and E0302-DH3
175 psi maximum for E0302-DA

Valve Material: Cast Steel, Ductile Iron, or Cast Iron, depending on model

End Connection: Flange x Flange, Groove x Groove

Threaded Opening: BSPT

Mounting: Vertical or Horizontal, depending on model

Trim Options: Wet Pilot, Dry Pilot, Electric Release, Test and Alarm, Drain and Drip Trim

Finish: Red RAL 3001, RAL 3000 depending on model

Approval: UL Listed

EMACO Deluge Valve is a hydraulic valve used for activation in fire protection systems.

A diaphragm inside the valve is normally pushed with hydraulic pressure that keeps the waterway closed when idle. A trigger signal causes the pressure on the diaphragm to drop, and this causes it to retract, opening the waterway for water to flow into the piping network. This signal can be hydraulic, pneumatic, or electric, based on the trim configuration.

In deluge systems, this valve is used as the main activation valve. This type of valve is used where a large quantity of water needs to be discharged over a protected area in a short time. It is normally used with open nozzles, spray systems, or foam-water systems where fast water application is required.

Deluge valves are often used in high-hazard fire protection systems because they can automatically activate to rapidly discharge large volumes of water immediately after the threat is identified. They are commonly used for transformer protection, storage tank protection, conveyor protection, aircraft hangars, chemical storage areas, power plants, and industrial process areas.

Common uses of deluge fire protection systems include:

Power transformer protection
Storage tank protection
Conveyor protection systems
Aircraft hangars
Chemical storage and processing facilities
Power plants
Water spray systems
Foam-water deluge systems

The valve can be configured with different trim arrangements depending on the system requirement. Wet pilot trim uses a hydraulic release line. Dry pilot trim uses pneumatic release. Electric trim uses solenoid operation. Test and alarm trim is used for the alarm and testing functions.

Design Specifications:

Hydraulically operated deluge valve for deluge fire protection systems
Nominal size options: 50 NB, 80 NB, 100 NB, 150 NB, and 200 NB
Available in cast steel, ductile iron, or cast iron body construction depending on model
End connection options include Flange x Flange and Groove x Groove
Threaded opening: BSPT
Vertical or horizontal mounting available for E0302-DH2 and E0302-DH3
90° pattern inlet to outlet vertical mounting for E0302-DA
Trim options include wet pilot, dry pilot, electric release, test and alarm, and drain and drip trim
Finish: Red RAL 3001 / RAL 3000 depending on model
UL Listed Deluge Valve for fire protection applications
System installation should follow NFPA requirements and local authority requirements where applicable

What makes EMACO’s Deluge Valve suitable for high-hazard industries?

High-hazard facilities often involve flammable liquids, pressurized gases, or machinery that generates intense heat. Fires in these environments escalate fast. The deluge system’s open-nozzle network delivers water over large areas at once, preventing heat buildup and secondary ignition. Its UL certification ensures predictable opening time, pressure stability, and material integrity under real-world conditions.

Can this valve be used in foam-water systems for fuel fires?

Yes. When integrated with a foam proportioner, the valve releases water mixed with foam concentrate. This forms a vapor-tight blanket ideal for petroleum-based and polar solvent fires. The hydraulic trim ensures smooth discharge, enabling uniform foam expansion across tank tops, bund walls, and spill floors.

How often should the Deluge Valve be tested, and why is testing crucial?

Quarterly or semi-annual testing verifies that:

Pilot lines depressurize correctly
The valve opens without mechanical resistance
Trim components respond to detection signals
This prevents hidden failures caused by sediment buildup, seal degradation, or undetected corrosion. Testing ensures the system opens instantly when a real fire occurs.

What type of activation system can be used with this valve?

Activation options include:

Electric solenoid valves connected to fire alarms
Hydraulic pilot lines reacting to pressure loss
Pneumatic lines triggering via heat expansion
Manual pull stations
By combining detection types, facilities gain layered protection. Even if one trigger fails, backup logic ensures activation.

Is field maintenance difficult, and what parts typically wear first?

Maintenance is straightforward because trims are externally mounted and accessible. Wear typically begins in:

Pilot line seals
Diaphragm membranes
Strainer screens
These components experience pressure cycling and water quality exposure. Regular replacement of low-cost seals prevents expensive downtime and preserves opening response time.

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