Medium Velocity Fixed Spray Nozzle

Model: EM-A, EM-AS, EM-B, EM-BS, EM-E
K-factor: 18 (1.26), 22 (1.54), 26 (1.8), 30 (2.10), 35 (2.45), 41 (2.87), 51 (3.57), 64 (4.48), 79 (5.53), 91 (6.37), 102 (7.14)
Spray Angle: 65°, 80°, 90°, 100°, 110°, 120°, 140°, 160°
Thread: 1/2” NPT / BSPT
Maximum Working Pressure: 175 psi (12 bar)
Minimum Operating Pressure: 20 psi (1.4 bar)
Strainer: Copper, Stainless Steel (Optional)
Nozzle Material: Brass, Stainless Steel, Aluminium Bronze
Finish: Natural Brass, Bright Brass, Chrome Plated, White Plated, Nickel Plated, Electroless Nickel Plated, Epoxy Powder Coated
Standard: NFPA 15
Approval: UL Listed & FM Approved
View technical datasheet for more information

EMACO Medium Velocity Fixed Spray Nozzle is an open type water spray nozzle used in fixed fire protection systems. It is typically installed in medium velocity water spray systems designed to apply water over exposed equipment and structural surfaces during a fire.

The nozzle produces a spray pattern using a deflector. When water flows through the nozzle, it hits the deflector, which breaks it into small droplets and spreads over the protected surface. This allows the water to absorb heat and cool down surfaces that are exposed to fire.

Medium velocity spray nozzles are commonly used in water spray systems for equipment cooling and exposure protection. These systems are designed to control the heating up of structures and equipment during a fire, preventing the spread of fire.

In a typical water spray system, a deluge valve is used to activate it. As the deluge valve opens, water enters the piping network and flows to the nozzles. The nozzle then distributes the water over the protected area. The droplets cool the surface, absorb heat from the fire, and reduce heat exposure.

Medium velocity nozzles are mainly used for cooling and exposure protection instead of directly extinguishing fires. They are designed to apply water over surfaces. This not only prevents the spreading of fire, but also limits damage and prevents the collapse of important equipment and structures such as storage tanks, steel frames, and other vulnerable structures.

Water spray systems are commonly installed in industrial facilities where exposed equipment requires cooling during a fire.

Typical applications include:

Transformer protection systems
Cable tray protection
Petrochemical process equipment
Steel structure cooling
Tank farm exposure protection
Power generation facilities

The nozzle may be installed in different orientations depending on the required coverage area. Spray angle and K-factor selections allow the system designer to achieve the correct water distribution pattern for the hazard being protected.

The nozzle is typically installed in fixed water spray systems or deluge systems designed according to NFPA 15.

Design Specifications:

1/2″ NPT / BSPT threaded connection
Brass, stainless steel, or aluminium bronze construction
Natural brass, bright brass, chrome-plated, white-plated, nickel-plated, electroless nickel-plated, epoxy powder-coated finish options
Discharge K-factor from 18 to 102 (1.26 to 7.14)
Spray angle options from 65° to 160°
Working pressure 12 bar (175 psi)
Minimum working pressure is approximately 20 psi (1.4 bar) for an effective spray pattern
Optional strainer with certain models
Optional FM Approved blow-off plug
Designed for installation in NFPA 15 water spray fire protection systems
UL Listed & FM Approved Medium Velocity Spray Nozzle

1. What makes medium-velocity nozzles different from high-velocity types?

Medium velocity nozzles aren’t aimed at direct flame attack over distance. Instead, they create a thermal cooling shield and suppress vapors near the hazard source. This makes them ideal for tanks, machinery, pumps, and equipment exposed to radiant heat, where controlling surface temperature prevents ignition.

2. Can these nozzles operate using seawater or untreated sources?

Yes. When using seawater or corrosive fluids, stainless steel or nickel-plated versions are recommended. These prevent mineral deposits, corrosion, or thread deterioration, ensuring accurate spray geometry and long-term reliability.

3. What criteria determine the correct nozzle selection?

Engineers select nozzles based on K-factor, spray angle, and hydraulic demand. The design considers fuel type, required water density, maximum heat flux, wind movement, and installation height. EMACO provides engineering support when requested.

4. How often should the nozzles be replaced or tested?

Replacement is uncommon unless there’s visible corrosion, blockage, or mechanical damage. Annual inspection and hydraulic testing are typically enough to verify performance. Plants handling acids, marine exposure, or heavy hydrocarbon vapors may need more frequent flushing.

5. Can EMACO MV nozzles integrate into older systems without modifications?

Yes. They are available in BSP and NPT threading and a wide range of K-factors. This allows direct installation in legacy deluge systems wit

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