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Pre action system

Pre-Action Systems

Pre-Action fire sprinkler systems employ the dry pipe concept, where water is kept from sprinkler piping by a Pre-Action Valve.

These systems, particularly double interlock pre-action systems, demand two distinct fire detection signals for activation. Specifically designed for water-sensitive environments requiring protection from inadvertent water flow, these systems ensure the released water is appropriately directed, preventing unnecessary damage.

The electrically operated valves in the system offer precise control over water flow from the sprinkler heads. Our HD Pre-Pack® presents a pre-assembled Pre-Action System housed in a self-contained cabinet, while HD Pre-Action systems are also available in a skid-mounted configuration. UL Listed, these systems can be configured as single or double-interlock, offering various options.

The standard pre-action sprinkler system comprises components such as the HD deluge pre-action valve, riser check valve, pre-action trim, fail-safe valve, butterfly valve, pressure switches, solenoid valve, air compressor, and a releasing panel. For comprehensive details on approval, technical specifications, and ordering information, please refer to our product catalogues.

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FAQ

What is a Pre-Action Fire Sprinkler System, and how does it work?

A pre-action system keeps the sprinkler piping dry. Water only enters the pipes after a preliminary fire detection system confirms a fire event. After that the sprinklers open individually when heat activates each sprinkler head. This two-step process prevents accidental discharge and keeps water use targeted.

Single vs Double Interlock Pre-Action Sprinkler Systems

Single Interlock: The detection system trips the pre-action valve, allowing water into the pipes. Sprinklers still release water only when their heads open due to heat.

Double Interlock: Both a detection signal and activation of a sprinkler head (or loss of air pressure in pneumatic systems) must occur before water fills the piping. This offers the highest level of protection against unintended water flow.

What are the advantages of a pre-action fire protection system?

Pre-action systems prevent unwanted water release, safeguard sensitive environments like data centers and archives, and provide precise, reliable fire suppression. They combine the responsiveness of sprinklers with the added safety of controlled water entry.

 

What is the difference between a pre-action and a dry sprinkler system?

A dry sprinkler system keeps the pipes filled with pressurized air or nitrogen. When a sprinkler head activates, the air releases, and water immediately flows in.

A pre-action system adds a detection layer. This preliminary step dramatically reduces the chance of accidental water discharge.

What is the NFPA standard for pre-action systems?

Pre-action sprinkler systems fall under NFPA 13, which outlines design, installation, and performance requirements. Additional detection and releasing components may follow NFPA 72 for fire alarm and signalling systems.

What is the difference between a deluge and a pre-action sprinkler system?

A deluge system has open sprinkler heads or nozzles, and releases water everywhere in the protected area once the detection system activates the deluge valve. A pre-action system uses closed sprinklers, so water discharges only from heads exposed to heat. It offers far more controlled suppression than a deluge system which offers total flooding.

Do you supply Pre-Action Systems to other countries?

Yes. We supply our pre-action systems and related components to multiple international markets, including India, Saudi Arabia, UAE, Qatar, Thailand, Indonesia, Malaysia, Philippines, etc. Clients in these regions rely on our UL Listed systems for data centers, commercial spaces, and other water-sensitive environments.

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Disclaimer

THESE MATERIALS ARE NOT DIRECTED AT OR INTENDED TO BE ACCESSED BY PERSONS LOCATED OUTSIDE INDIA. IMPORTANT: You must read and agree with the terms and conditions of the following disclaimer before continuing. The following disclaimer applies to the draft red herring prospectus of HD Fire Protect Limited (the “Company”) dated September 24, 2025 (the “Draft Red Herring Prospectus”) filed with the Securities and Exchange Board of India (“SEBI“), BSE Limited and National Stock Exchange of India Limited (together, the “Stock Exchanges”), as well as the audio visual film of the Company (the “IPO AV”), in relation to the proposed initial public offering of the equity shares of face value of ₹5 each of the Company (“Equity Shares”) in India (“Offer”). You are advised to read this disclaimer carefully before reading, accessing or making any other use of the Draft Red Herring Prospectus and the IPO AV. 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