DCT27 Pre Action Valve
Devinsan offers highly secure fire suppression solutions engineered for reliable water release only after dual-stage detection in sensitive environments. Designed for superior damage mitigation and precise sequence control, these DCT27 Pre Action Valve units utilize a multi-directional bellow mechanism to meet the critical demands of modern facilities requiring zero accidental discharge.
Production Standard
Nominal Dimension (DN)
Nominal Pressure (PN)
Operating Temperature
Connection
Coating
Testing
DN 40 – 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 DCT27 Pre Action 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 DCT27 Pre Action Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DCT27 Pre Action Valve is a sophisticated, hydraulically-operated valve specifically engineered to control the flow of water into a sprinkler system that is typically supervised by air or nitrogen pressure. Designed to meet the stringent demands of modern infrastructure, this specialized valve ensures peak protection against accidental discharge (false trips) while guaranteeing rapid water delivery when a genuine fire event is confirmed.
At the core of the DCT27 Pre Action Valve is its diaphragm-actuated main valve held closed by control pressure. Activation requires a dual action: first, a signal from the separate electric fire detection system, and second, the opening of a sprinkler head (releasing supervisory air pressure). Only when both events occur does the valve trip, allowing water to flow. This double-interlock feature is vital for areas housing valuable property.
Manufactured from high-strength, corrosion-resistant materials (such as cast iron) and built with a robust, heavy-duty body, the DCT27 Pre Action Valve is designed to withstand continuous system pressure and dynamic forces during activation. Its flanged connections allow for secure integration into the main sprinkler riser. The ability to monitor the piping system with low-pressure air provides continuous leak detection without the risk of water damage from a broken sprinkler head.
The DCT27 Pre Action Valve is ideally suited for deployment in museums, archives, computer data centers, cold storage facilities, and any space where accidental water release would cause unacceptable damage. Its unique dual-action safety mechanism and proven fast-opening capability make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for critical asset protection.
In summary, the DCT27 Pre Action Valve offers an optimal combination of accidental discharge prevention, rapid fire response, and continuous pipe supervision. With its pressure-differential clapper and reliance on two independent signals for activation, this unit stands as a trusted solution for modern fire protection and sensitive environment requirements worldwide.
1. General Information
The DCT27 Pre Action Valve is designed for installation on the main sprinkler system riser, requiring secure connection to the water supply, the air supervisory line, and the electrical fire detection panel. Proper installation is essential to guarantee reliable dual-action activation.
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 and integrating complex electrical systems.
Wear appropriate personal protective equipment (PPE).
Confirm that the fire water main and the system air supply are isolated and fully depressurized before attempting to install the DCT27 Pre Action Valve.
3. Pre-Installation Checklist
Inspect the DCT27 Pre Action Valve for any visible damage during transport or storage, paying attention to the clapper assembly and complex trim components.
Check that the valve type, size, and pressure rating match the system requirements.
Verify that the valve interior and control ports 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 deluge trim, the fire panel interface, and the air supervisory system components.
4. Installation Procedure
Positioning: Install the DCT27 Pre Action Valve vertically on the main riser, ensuring the flow direction adheres to the arrow cast on the body.
The valve trim (solenoid, pressure switches, supervisory equipment) must be installed according to the hydraulic and electrical schematic.
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 trim and the detection line interfaces securely.
5. Post-Installation
Charge the sprinkler piping with supervisory air pressure, then slowly introduce water pressure to the supply side.
Verify that the air pressure and water pressure stabilize correctly, keeping the valve clapper securely closed.
Verify the solenoid’s response to electrical signals from the fire panel and test the air pressure trip point.
Record the installation details, set pressures, and final notes for documentation purposes.
Proper maintenance extends the service life of the DCT27 Pre Action Valve and ensures reliable dual-action activation and accidental discharge prevention. Follow the guidelines below to maximize the longevity and readiness of this essential unit.
1. Routine Operation
Visually inspect the DCT27 Pre Action Valve and all associated trim piping and electrical connections regularly (e.g., weekly) for signs of external leakage or damage.
Check the air pressure gauge to ensure the supervisory air is maintained within the required tolerance at all times.
2. Inspection Schedule
Monthly, verify the stability of the air and water pressure gauges to ensure no pressure imbalance is occurring.
Quarterly, check the cleanliness of the pilot line strainers, the alarm test valve, and the air supply connections.
Annually, perform a mandatory “full flow trip test” to verify the entire system (electrical detection and hydraulic valve) activates reliably and simultaneously.
3. Lubrication
The internal moving parts (main clapper hinge) of the DCT27 Pre Action Valve are generally 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 leakage is observed during the static water pressure test.
Trim piping seals should be replaced if external leakage is detected.
Always isolate the system water supply, bleed the pressure, and disconnect electrical power before attempting any maintenance work requiring cover removal.
5. Cleaning
Keep the exterior of the DCT27 Pre Action Valve and its complex trim assembly clean to prevent corrosion.
Ensure the entire system, especially the main clapper sealing area, is kept dry and clean to prevent scale buildup that could hinder activation.
6. Storage and Spare Parts
Store spare parts (clapper seals, gaskets, solenoids, trim components) in a dry, clean, and cool environment, away from direct sunlight and temperature extremes.
Maintain a detailed record of all inspections, trip tests, and repairs performed on the DCT27 Pre Action 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 DCT27?
What are the main advantages of this valve?
The DCT27 Pre Action Valve provides the highest level of security against accidental discharge (false trips) by requiring two independent events (electrical detection + pneumatic pipe pressure loss) before releasing water into the sprinkler piping.
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 does the term "dual action" mean for the DCT27 Pre Action Valve?
“Dual action” refers to the requirement for two events—one from the electrical system (fire alarm) and one from the pneumatic system (sprinkler head opens and releases air)—to occur before the DCT27 Pre Action Valve will open and flood the system.
Where is the DCT27 Pre Action Valve typically used?
It is typically used in environments where the high cost of accidental water discharge (e.g., in data centers, server rooms, or museums) justifies the added complexity and safety of the dual-interlock system.
How does the DCT27 Pre Action Valve protect against freezing?
It protects against freezing because the piping system itself is supervised by air or nitrogen, not water. Water is held back by the valve and only admitted into the pipes after a fire is detected by the external system.
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