ZSTM Water Curtain Nozzle
The ZSTM Series Water Curtain Nozzles are designed to create a continuous water barrier for fire separation, heat shielding, and structural cooling. Commonly used with fire shutters, fire curtains, glass facades, and large building openings, these nozzles help prevent fire spread and reduce radiant heat transfer. Available in multiple spray angles and flow capacities, they provide reliable protection for commercial, industrial, and public building fire protection systems.
Description
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Products Description

ZSTM Water Curtain Nozzle
The ZSTM Series Water Curtain Nozzles are essential components used in water curtain fire protection systems. They are specifically designed for fire separation, heat shielding, and cooling protection applications. By creating a continuous water curtain, these nozzles help prevent the spread of fire and reduce radiant heat transfer.
ZSTM water curtain nozzles are commonly installed together with fire curtains, fire shutters, doors, windows, glass curtain walls, and protective walls. They are widely used in commercial buildings, industrial facilities, warehouses, shopping centers, theaters, and other locations requiring passive fire protection.
Technical Specifications
| Model | Installation Type | Thread Connection | Flow Coefficient (K) | Spray Angle | Minimum Working Pressure |
|---|---|---|---|---|---|
| ZSTMZ Combination Water Curtain | Upright | R2" or Welded | 15–200 | 120° | 0.35 MPa |
| ZSTMA-T10/150 | Pendent | R1/2" | 10 | 150° | 0.10 MPa |
| ZSTMA-T21.5/150 | Pendent | R1/2" | 21.5 | 150° | 0.10 MPa |
| ZSTMB-T8/120 | Pendent or Horizontal | R3/4" | 8 | 120° | 0.10 MPa |
| ZSTMB-T18/120 | Pendent or Horizontal | R1/2" | 18 | 120° | 0.10 MPa |
| ZSTMB-T28/120 | Pendent or Horizontal | R1/2" | 28 | 120° | 0.10 MPa |
| ZSTMB-T35/120 | Pendent or Horizontal | R1/2" | 35 | 120° | 0.10 MPa |
| ZSTMB-T50/120 | Pendent or Horizontal | R1/2" | 50 | 120° | 0.10 MPa |
| ZSTMB-T80/170 | Pendent or Horizontal | R1/2" | 80 | 170° | 0.10 MPa |
How Does a Water Curtain System Work?
When activated, pressurized water flows through the nozzle and strikes a specially designed deflector. The water is dispersed into a wide-angle spray pattern, forming a continuous curtain of water.
This water curtain serves several important functions:
Blocks radiant heat from reaching adjacent areas.
Helps prevent ignition of combustible materials.
Cools structural elements such as doors, shutters, windows, and walls.
Assists in controlling fire spread through open spaces.
The effectiveness of the system depends on proper nozzle spacing, spray angle, flow rate, and water pressure.
| Feature | Water Curtain Nozzle | Fire Sprinkler |
|---|---|---|
| Primary Purpose | Fire separation and cooling | Fire suppression |
| Spray Pattern | Fan-shaped water curtain | Water distribution over hazard area |
| Coverage | Openings and barriers | Protected room area |
| Installation | Above doors, windows, shutters | Ceiling-mounted throughout building |
| Function | Heat shielding | Extinguishing or controlling fire |

Typical Installation Locations
Water curtain nozzles are widely used in buildings and industrial facilities where fire separation and exposure protection are required. They are particularly valuable in locations where traditional fire walls cannot be installed or where large openings must remain accessible during normal operations.
By creating a continuous sheet of water, these nozzles help limit the spread of flames, smoke, and radiant heat while protecting adjacent structures and equipment.
Fire Shutter Protection Systems
One of the most common applications of water curtain nozzles is the protection of fire shutters. When a fire occurs, the water curtain works together with the fire shutter to reduce heat transfer and improve the overall fire-resistance performance of the opening. This combination is widely used in shopping malls, warehouses, factories, and logistics centers.
Glass Curtain Wall Protection
Modern buildings often feature extensive glass facades that are vulnerable to thermal stress during a fire. Water curtain nozzles can be installed along glass curtain walls to provide cooling protection, reduce the risk of glass breakage, and help prevent fire spread between building sections.
Warehouse Openings and Loading Bays
Large warehouse doors and loading areas frequently require unobstructed access for vehicles and material handling equipment. Water curtain systems provide a practical fire protection solution by creating a temporary fire barrier when activated, without affecting daily operations.
Factory Production Areas
Manufacturing facilities often contain large open spaces, production lines, and valuable equipment. Water curtain nozzles can be used to separate fire zones, protect critical machinery, and reduce the risk of fire spreading from one production area to another.
Theater Stages and Performance Venues
Theaters traditionally use water curtain systems to separate stage areas from audience seating. In the event of a fire, the water curtain helps contain flames and smoke within the stage area, providing additional protection for occupants and evacuation routes.
Aircraft Hangars
Aircraft hangars contain large unobstructed spaces and high-value assets. Water curtain nozzles may be installed around maintenance areas, hangar doors, or hazard zones to provide fire separation and cooling protection in accordance with facility fire safety requirements.
Petrochemical and Industrial Facilities
Refineries, chemical plants, fuel storage terminals, and other industrial facilities often utilize water curtain systems to protect process equipment, storage tanks, pipelines, and structural components from radiant heat exposure. These systems can help reduce escalation risks during major fire incidents.



Importance of Spray Angle Selection
The spray angle is one of the most important factors in the performance of a water curtain nozzle. Choosing the correct spray angle ensures that a continuous and uniform water barrier is formed across the protected opening. An improperly selected spray angle may leave unprotected gaps, reduce cooling efficiency, or result in excessive water consumption.
The spray angle determines the width of the water curtain, water distribution density, and overall protection effectiveness. Engineers must consider installation height, nozzle spacing, water pressure, and the dimensions of the protected area when selecting the appropriate nozzle model.
120° Water Curtain Nozzles
120° nozzles produce a relatively concentrated spray pattern with higher water density. The water curtain is thicker and provides excellent cooling performance, making these nozzles suitable for narrow openings and applications where strong heat absorption is required.
Typical applications include:
Industrial fire shutters
Equipment protection systems
Warehouse compartment openings
Areas with high radiant heat exposure
Because the spray pattern is more concentrated, fewer water droplets are lost to wind or air movement, making 120° nozzles particularly effective in industrial environments.
150° Water Curtain Nozzles
150° nozzles provide a balance between coverage width and water density. They are among the most commonly used water curtain nozzles in commercial and industrial fire protection systems.
Benefits include:
Wider protection coverage than 120° models
Good cooling and heat shielding performance
Reduced number of nozzles required for large openings
Suitable for both fire separation and exposure protection
These nozzles are frequently installed above fire doors, fire shutters, loading bays, and large building openings where a continuous water curtain is required.
170° Water Curtain Nozzles
170° nozzles generate an ultra-wide spray pattern that maximizes coverage area. They are designed for applications where large openings or expansive surfaces must be protected.
Typical applications include:
Glass curtain wall protection
Atriums and open architectural spaces
Shopping malls
Exhibition centers
Airport terminals
Large industrial facilities
The wider spray angle allows a larger area to be covered with fewer nozzles, reducing installation costs while maintaining effective fire separation and cooling protection.
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NO.8, YUANFENG ROAD, MEIYUAN VILLAGE, KANGMEI TOWN, NANAN CITY, QUANZHOU CITY, FUJIAN CHINA
+86 18160950625
miki@ca-fire.com

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