DCT24 Wet Alarm Valve
Devinsan offers specialized life safety solutions engineered for instantaneous detection of water flow and reliable activation of alarm signaling in wet pipe sprinkler systems. Designed for structural integrity and constant system readiness, these DCT24 Wet Alarm Valve units utilize a sensitive clapper mechanism to meet the crucial demands of modern commercial and residential fire protection networks.
Production Standard
Nominal Dimension (DN)
Nominal Pressure (PN)
Operating Temperature
Connection
Coating
Testing
DN 100 – DN 200
PN 6-PN 10-PN 16
-30° / +200°
EN 1092-2 ISO7005-2 Flanged
Electrostatic Powder Epoxy
TS EN 14384
Application Areas
The DCT24 Wet Alarm Valve is widely used across diverse industrial and commercial sectors, delivering reliable flow control and long‑lasting performance.
1. Water and Wastewater Systems
2. Chemical Industry
3. Food and Beverage Industry
4. Pharmaceutical Industry
5. Oil and Gas Industry
6. HVAC (Heating, Ventilation, Air Conditioning) Systems
In these applications, this type DCT24 Wet Alarm Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DCT24 Wet Alarm Valve is a critical component specifically engineered to monitor water flow within wet pipe fire sprinkler systems and simultaneously initiate local and remote fire alarms upon sprinkler activation. Designed to meet the stringent safety demands of modern infrastructure, this specialized valve ensures rapid response time, outstanding durability, and continuous pressure supervision for reliable life and property protection.
At the core of the DCT24 Wet Alarm Valve is its hydraulically operated clapper assembly and the water motor gong connection. When one or more sprinkler heads activate, the resulting flow of water lifts the clapper, allowing pressurized water to flow to the alarm system (gong) and the sprinkler network. The clapper also prevents reverse flow, ensuring the water supply remains dedicated to the activated sprinkler heads.
Manufactured from high-strength, corrosion-resistant materials (such as cast iron) and built with a robust, heavy-duty body, the DCT24 Wet Alarm Valve is designed to withstand continuous system pressure and the dynamic forces of water discharge. Its standard flanged connections allow for secure integration into the main sprinkler riser. The unit includes essential trim components, such as the pressure switch connection and the retard chamber, which prevents false alarms from minor pressure fluctuations.
The DCT24 Wet Alarm Valve is ideally suited for deployment in high-rise buildings, commercial warehouses, industrial facilities, and any structure utilizing a wet pipe sprinkler system where reliable, automated fire detection and suppression are essential. Its proven activation mechanism and dependable isolation make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for long-term life safety assurance.
In summary, the DCT24 Wet Alarm Valve offers an optimal combination of flow detection, immediate alarm activation, and secure backflow prevention. With its robust clapper mechanism, essential retard chamber, and durable construction, this unit stands as a trusted solution for modern fire protection and life safety requirements worldwide.
1. General Information
The DCT24 Wet Alarm Valve is designed for installation on the main sprinkler system riser, requiring precise vertical alignment and secure connection to the water supply and alarm piping. Proper installation is essential to guarantee safe operation, long service life, and reliable alarm function.
2. Safety Precautions
Installation must be performed by qualified personnel only, typically licensed fire protection contractors.
Ensure strict compliance with all local fire codes, NFPA standards, and safety regulations concerning connecting to pressurized fire water mains.
Wear appropriate personal protective equipment (PPE).
Confirm that the fire water main section is fully isolated, depressurized, and drained before attempting to install the DCT24 Wet Alarm Valve.
3. Pre-Installation Checklist
Inspect the DCT24 Wet Alarm Valve for any visible damage during transport or storage, paying attention to the clapper assembly and trim connections.
Check that the valve type, size, and pressure rating match the system requirements.
Verify that the valve interior and alarm port are clean and free from debris.
Confirm that the mating pipeline flanges are properly aligned (parallel and concentric) and free from burrs or sharp edges.
Ensure sufficient space is available around the valve for connecting the retard chamber, pressure switches, and alarm gong.
4. Installation Procedure
Positioning: Install the DCT24 Wet Alarm Valve vertically on the main riser, ensuring the flow direction adheres to the arrow cast on the body.
The alarm port must be oriented correctly for connection to the retard chamber and alarm piping.
Use the appropriate gaskets suitable for the medium and operating conditions.
Align the valve precisely between the pipeline flanges and insert bolts, tightening them gradually and crosswise in incremental steps.
Connect the external alarm trim, including the retard chamber and pressure switches, following the manufacturer’s schematic.
5. Post-Installation
Slowly reintroduce water pressure into the sprinkler system, checking immediately for leaks around the flange and trim connections.
If leakage is detected, depressurize the system immediately and re-tighten the bolts following the cross-pattern sequence.
Verify the pressure switch operation and test the water motor gong function to ensure reliable alarm activation.
Record the installation details, set pressure, and final notes for documentation purposes.
Proper maintenance extends the service life of the DCT24 Wet Alarm Valve and ensures reliable flow detection and alarm activation. Follow the guidelines below to maximize the longevity and readiness of this essential unit.
1. Routine Operation
Visually inspect the DCT24 Wet Alarm Valve and all associated trim piping regularly (e.g., weekly) for signs of external leakage, especially from the retard chamber.
Check the system pressure gauge to ensure the main valve clapper remains seated under static pressure.
2. Inspection Schedule
Monthly, verify the gauge readings on both sides of the clapper to ensure pressure equality is maintained (indicating no false clapper lifting).
Quarterly, check the cleanliness of the pilot line strainers and the drain valves.
Annually, perform a mandatory “main drain test” to verify the alarm functions correctly and the clapper mechanism operates smoothly under flow conditions.
3. Lubrication
The internal moving parts (clapper hinge) of the DCT24 Wet Alarm Valve are generally designed to be maintenance-free or water-lubricated.
No external lubrication is required for the internal components.
4. Seal and Gasket Replacement
Replace the main clapper seal (gasket) and the housing gaskets immediately if internal leakage (false alarm flow) is observed during static pressure testing.
Trim piping seals should be replaced if external leakage is detected.
Always isolate the system water supply and fully bleed the pressure before attempting any maintenance work requiring cover removal.
5. Cleaning
Keep the exterior of the DCT24 Wet Alarm Valve clean to prevent surface corrosion.
Ensure the retard chamber and alarm line piping are flushed periodically to prevent sediment buildup that could inhibit alarm activation.
6. Storage and Spare Parts
Store spare parts (clapper seals, gaskets, pressure switches) in a dry, clean, and cool environment, away from direct sunlight and temperature extremes.
Maintain a detailed record of all inspections, flow tests, and repairs performed on the DCT24 Wet Alarm Valve unit.
We prioritize quality at every stage of production to deliver durable, safe, and efficient products. Our continuous improvement and strict quality controls keep us at the forefront of the industry.
Our certifications prove our commitment to excellence and compliance with international standards, ensuring the safety and reliability of our products worldwide.
We continuously invest in innovation and quality to expand our certifications and meet evolving industry needs.
Frequently Asked Questions about the DCT24?
What are the main advantages of this valve?
The DCT24 Wet Alarm Valve provides automatic, instantaneous detection of water flowing through the sprinkler system, immediately activating local (gong) and electrical alarms, which is crucial for early fire response and system monitoring.
Why should I choose this product?
This valve delivers outstanding performance in both sealing and durability, making it a dependable choice for demanding applications. Its straightforward design facilitates easy installation, offering flexibility during system design. With a wide range of material options, it meets the needs of various infrastructure projects, from municipal water networks to industrial facilities.
What is the function of the retard chamber in the DCT24 Wet Alarm Valve?
The retard chamber is a crucial component that temporarily holds water flow to the alarm during minor pressure surges or temporary water fluctuations, preventing false alarms while still ensuring the alarm activates quickly for a sustained flow (actual fire).
How does the DCT24 Wet Alarm Valve differentiate between a pressure surge and an actual fire?
It differentiates based on the duration of water flow. A short pressure surge quickly subsides, allowing the retard chamber to fill without activating the alarm. A sustained flow (from a broken sprinkler head) overcomes the chamber’s capacity, causing the pressure switch to trigger the alarm.
Is the DCT24 Wet Alarm Valve designed to shut off the flow of water?
No. The DCT24 Wet Alarm Valve is designed to initiate the alarm and prevent reverse flow (acting as a check valve). It does not shut off the flow of water; water continues to flow freely to the activated sprinkler heads to suppress the fire.
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