Deluge Valve — Complete Range for Fire Fighting Systems
A deluge valve is the master control valve in a deluge fire suppression system. When a fire signal is received — from a heat detector, smoke sensor, UV/IR flame detector, or manual pull station — the deluge valve opens fully and simultaneously floods all open sprinkler heads or spray nozzles in the protected zone. Unlike a wet-pipe or dry-pipe alarm check valve that activates one head at a time, a deluge valve releases water across the entire protected area in a single, instantaneous response.
This characteristic makes the deluge valve the correct specification wherever a fire can spread faster than individual sprinkler heads can respond: transformer bays, aircraft hangars, cable tunnels, LPG tank farms, chemical process units, offshore platforms, and other high-hazard industrial applications.
CA-FIRE manufactures eight deluge valve configurations covering the full spectrum of connection types, pressure ratings, material grades, and installation formats required for industrial and commercial fire protection projects worldwide.
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CA-FIRE Deluge Valve Product Range
Diaphragm Deluge Valve — Cast Iron Flanged Series (DN50–DN350)
The standard cast iron flanged deluge valve for the majority of industrial and commercial deluge applications. A flexible EPDM diaphragm seals the valve body under normal conditions; when the pilot control pressure is released by solenoid or manual trip, the supply pressure lifts the diaphragm and the valve opens fully. Available in 10 sizes from DN50 to DN350, rated 1.6 MPa, with dry pilot, wet pilot, or electric solenoid actuation. The foundation of CA-FIRE’s deluge valve range and the most widely specified configuration globally.
Specify when: Standard indoor or weatherproof-enclosure installation, ductile iron body acceptable, flanged connections throughout.
Deluge Valve Assembly — Horizontal Skid-Mounted System (DN50–DN350)
A complete, factory-assembled horizontal deluge valve station on a structural steel skid. The assembly integrates the deluge valve body, isolation valves, solenoid trip valve, pressure gauges, alarm pressure switch, water motor gong, drain valves, test connections, and local control panel — pre-piped, pre-wired, and factory-tested as a single deliverable. Reduces site installation to mechanical pipe connections and electrical terminations only.
Specify when: Project timeline is tight, site installation labour is expensive, or the system specification requires factory-witnessed pre-shipment testing of the complete assembly.
Deluge Valve Skid — Vertical Explosion-Proof Skid Assembly
A vertical-format skid-mounted deluge valve station with full explosion-proof (Ex) rated electrical components throughout — pressure switches, solenoid valves, junction boxes, and local control panel. The vertical skid configuration minimises floor footprint in congested plant rooms. Factory assembled, pressure-tested, and Ex-certified as a complete unit.
Specify when: Hazardous area classified location (Zone 1 or Zone 2), vertical layout preferred, skid-mounted delivery required.
Explosion-Proof Deluge Valve — 2.5 MPa High-Pressure Piston Type (DN50–DN300)
A piston-actuated deluge valve rated to 2.5 MPa working pressure — significantly above the 1.6 MPa rating of standard diaphragm-type valves — with full explosion-proof electrical accessories certified Ex db IIC T6 Gb. The piston mechanism provides superior resistance to pressure transients and water hammer in high-pressure supply systems. Suitable for petrochemical plant protection where both elevated supply pressure and hazardous area classification apply simultaneously.
Specify when: Supply pressure exceeds 1.6 MPa, hazardous area classification applies, piston actuation preferred for high-pressure stability.
Stainless Steel Deluge Valve — SS304/SS316 Explosion-Proof & Air-Controlled
A stainless steel body deluge valve for corrosive environment applications — coastal facilities, offshore platforms, chemical plants, food processing, and humid tropical climates where a carbon steel or ductile iron body would require frequent re-coating or early replacement. Available in SS304 (general corrosive environments) or SS316 (marine, offshore, chloride exposure). Pneumatic (air-controlled) actuation option available where electrical ignition sources must be eliminated entirely.
Specify when: Corrosive environment (coastal, chemical, offshore, food industry), SS material required, pneumatic actuation specified.
Pre-Action Deluge Valve — 2.5 MPa Pressurised Piston Type (DN50–DN300)
A pre-action deluge valve combines a pressurised piston-type deluge valve body with a supervised air or nitrogen charge on the downstream pipework and a detection system interlock — requiring both a detection signal and a sprinkler head to operate before water discharges. This double-interlock configuration provides the flood-protection and false-discharge prevention of a pre-action sprinkler system combined with the simultaneous-discharge capability of a deluge system. Suited to data halls, archives, and cold-chain facilities where accidental water discharge would cause unacceptable damage.
Specify when: High-consequence false-discharge risk, data centre or archive protection, pre-action double-interlock system specified.
Grooved Deluge Control Valve — Ductile Iron Quick-Connect Series (DN80–DN200)
A grooved-end deluge valve for installation in fully grooved piping systems. Victaulic-compatible grooved connections on inlet and outlet eliminate flange bolting — reducing installation time significantly on projects where grooved pipework is used throughout. Available DN80–DN200 in ductile iron with 1.6 MPa rating.
Specify when: Project specifies grooved piping throughout, fast-track installation schedule, DN80–DN200 sizes only.
Fire Sprinkler Alarm Valve — Temperature-Controlled Integrated Unit (DN32–DN80)
A compact, temperature-sensitive alarm valve designed for small-zone suppression where a heat-activated thermal element trips the valve directly without requiring a separate detection system or solenoid. The integrated alarm gong activates at the moment of valve opening. Available in small bore sizes DN32–DN80, this unit is suited to transformer protection, electrical panel rooms, and localised equipment protection where a full deluge system would be over-specified.
Specify when: Small protected zone (single equipment item or localised area), DN32–DN80 pipe sizes, self-actuating thermal trip without separate detection system, compact installation space.
Deluge Valve Selection Guide
| Requirement | Recommended Type |
|---|---|
| Standard industrial installation, 1.6 MPa | Diaphragm Deluge Valve |
| Complete factory-assembled station, fast site install | Deluge Valve Assembly |
| Hazardous area, vertical skid, Ex-rated | Deluge Valve Skid |
| High pressure ≥ 1.6 MPa + hazardous area | Explosion-Proof Deluge Valve |
| Corrosive / coastal / offshore / food industry | Stainless Steel Deluge Valve |
| Pre-action double-interlock, data centre/archive | Pre-Action Deluge Valve |
| Grooved piping system, DN80–DN200 | Grooved Deluge Control Valve |
| Small zone, self-actuating thermal trip, DN32–DN80 | Fire Sprinkler Alarm Valve |
What is a Deluge Valve System?
A deluge system is an open-head fire suppression system in which all sprinkler heads or spray nozzles are permanently open — there is no heat-sensitive element to melt before water can flow. Water is held back exclusively by the closed deluge valve upstream. When a fire is detected and the deluge valve opens, water discharges simultaneously from every nozzle in the zone.
This distinguishes the deluge system from a wet-pipe system (individual heads, closed until heat melts the fusible element) and from a dry-pipe or pre-action system (individual heads, pressurised air in the pipe). The simultaneous full-zone discharge of a deluge system makes it the correct choice wherever fire could spread across the protected area faster than successive individual head operation could contain it.
Deluge systems per NFPA 15 (Water Spray Fixed Systems) and NFPA 13 are commonly applied to:
- Power transformers and electrical switchgear (transformer deluge protection is the most common single application globally)
- LPG, LNG, and flammable liquid tank farms and loading gantries
- Aircraft hangars (NFPA 409)
- Cable tunnels and tray areas in power stations and process plants
- Offshore platform process decks and wellhead areas
- Conveyor tunnel fire protection in mining and materials handling
- Chemical reactor protection and process hazard mitigation
How a Deluge Valve Works
In normal standby condition, the deluge valve is held closed by a small volume of pressurised water or air in the valve’s control chamber, acting on the diaphragm or piston against the supply pressure. The system side of the valve — all the open nozzle pipework — remains dry.
When a fire detector sends a signal to the deluge control panel, the panel energises a solenoid trip valve which vents the control chamber pressure to drain. With control pressure removed, the supply pressure immediately drives the diaphragm or piston fully open. Water floods the open nozzle network and discharges simultaneously from all heads. Simultaneously, water flows through the alarm port to activate the water motor alarm gong and trip the pressure switch, sending an electrical signal to the fire alarm panel.
After the fire is controlled and the water supply is isolated, the control chamber is re-pressurised to reseat the valve, and the system is restored to standby.
Three standard control modes are available across CA-FIRE’s deluge valve range: electric solenoid (most common — fire detection panel trips solenoid directly), wet pilot (a pressurised water pilot line from a separate detector valve trips the deluge valve — used where electrical power is unreliable), and dry pilot (a pressurised air/nitrogen pilot line — used in freezing environments where the wet pilot line could freeze).
Technical Specifications — CA-FIRE Deluge Valve Range
| Parameter | Standard Range | High-Pressure Range |
|---|---|---|
| Nominal sizes | DN50 – DN350 | DN50 – DN300 |
| Working pressure | 1.6 MPa | 2.5 MPa |
| Seal test pressure | 3.2 MPa | 5.0 MPa |
| Strength test pressure | 6.4 MPa | 8.0 MPa |
| Body material | Ductile iron / SS304 / SS316 | Carbon steel / SS304 |
| Actuation modes | Electric solenoid / Wet pilot / Dry pilot / Manual | Electric solenoid / Manual |
| Control modes | Automatic / Semi-automatic / Manual | Automatic / Manual |
| Standards | GB 5135.2, NFPA 13, NFPA 15 | GB 5135.2, NFPA 13 |
| Explosion-proof rating | Ex db IIC T6 Gb (Ex variant) | Ex db IIC T6 Gb |
Deluge Valve vs Alarm Check Valve — Key Differences
Engineers specifying for the first time sometimes confuse deluge valves and alarm check valves. The distinction is straightforward:
An alarm check valve (wet alarm valve) is used in a closed-head wet-pipe sprinkler system. The downstream pipework is filled with water at all times. Individual sprinkler heads open one at a time when the fusible element melts. The alarm check valve detects flow and triggers the alarm but does not itself control activation.
A deluge valve is used in an open-head system. The downstream pipework is dry. All nozzles discharge simultaneously when the deluge valve opens. The deluge valve is the sole barrier between water supply and discharge — its opening IS the activation event.
The two valve types are never interchangeable. If your system has open nozzles, specify a deluge valve. If it has closed (fusible-element) heads, specify an alarm check valve.
Applications
Power generation: Transformer deluge protection is the largest single global application for deluge valves. A transformer fire can propagate to adjacent units rapidly; deluge coverage of the full transformer bay is standard practice in IEC and NFPA-compliant substation design.
Oil, gas and petrochemical: LPG and LNG tank farm deluge systems, loading gantry protection, process unit deluge curtains, and pump room protection all require deluge valves rated for hazardous area classification — typically the explosion-proof or stainless steel skid variants.
Aviation: Aircraft hangars require deluge systems per NFPA 409 due to the speed at which aviation fuel fires spread. Large-bore deluge valves (DN200–DN350) serve the foam-water deluge systems protecting ground-level aircraft.
Offshore platforms: Process deck deluge systems, wellhead area protection, and helideck foam deluge systems on offshore oil and gas platforms require stainless steel construction and Ex-rated accessories to withstand the marine environment.
Cable tunnels and power stations: Simultaneous suppression across the full cable tunnel cross-section requires the zone-wide coverage that only a deluge system provides.
Mining and materials handling: Conveyor tunnel fire protection, crusher station protection, and electrical substation deluge systems in mining operations are a major industrial application, often requiring explosion-proof components in coal and gas mines.
Why Choose CA-FIRE Deluge Valves
CA-FIRE is a leading manufacturer of fire protection equipment with over a decade of experience in engineering reliable deluge valve and deluge valve fire fighting system solutions for global industrial, commercial, and infrastructure projects. Here’s why our fire deluge valve is the trusted choice:
✅ Certified Quality: All deluge valves are tested and certified by national fire detection and fire protection product testing centers, complying with GB, ISO, and NFPA standards.
✅ Diverse Product Range: Comprehensive deluge valve types (diaphragm, alarm, explosion-proof, skid-mounted) to suit all fire protection needs.
✅ Custom Engineering: Tailor-made deluge valve assembly and system solutions for unique industrial and hazardous environment requirements.
✅ Reliable Performance: Robust construction, high-performance deluge valve diaphragm, and fast response times for critical fire suppression.
✅ Global Project Experience: Our deluge valve systems are installed in high-profile projects worldwide, including airports, petrochemical plants, data centers, and power stations.
✅ After-Sales Support: Professional technical support, on-site installation guidance, and spare parts supply (including replacement deluge valve diaphragm) for long-term system reliability.
Get a Quote
Contact CA-FIRE’s technical team with your system design parameters — protected area dimensions, hazard classification, required flow rate, supply pressure, pipe size, and any Ex rating or material requirements — and we will recommend the appropriate deluge valve configuration and provide a factory-direct quotation.
- Email: sales@ca-fire.com
- Mobile: +86 13400715622 | WhatsApp: +86 18150362095
- WeChat: 404863577
- Website: www.ca-fire.com
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