DCT21 Basic Control Valve
Devinsan offers robust, versatile main valve bodies engineered for reliable hydraulic operation and seamless integration with complex pilot control circuits. Designed for high-flow capacity and customizable regulation, these DCT21 Basic Control Valve units provide the foundational platform necessary to meet the critical demands of modern municipal and industrial fluid management systems.
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 DCT21 Basic Control 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 DCT21 Basic Control Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DCT21 Basic Control Valve is the foundational hydraulic component designed to serve as the main, diaphragm-operated valve for various control functions, including pressure, flow, and level regulation. Designed to meet the stringent demands of modern infrastructure, this specialized valve ensures high flow capacity, rapid operational response, and long-term durability when controlled by an external pilot system.
At the core of the DCT21 Basic Control Valve is its diaphragm-actuated globe or angle-style body and its large main chamber. The hydraulic pressure applied to the diaphragm (controlled by external pilot components) determines the valve’s opening or closing position. This mechanism ensures stable, reliable modulation and precise control over large fluid flows, effectively managing system dynamics and transients.
Manufactured from high-strength, corrosion-resistant materials (such as ductile iron) and built with a robust, heavy-duty body, the DCT21 Basic Control Valve is designed to withstand continuous system pressure and dynamic forces. Its streamlined flow path minimizes hydraulic head loss when the valve is fully open. The true strength of this unit lies in its modularity, as it can be converted into any specific control valve function (e.g., pressure reducing, pressure sustaining) simply by changing the external pilot circuit.
The DCT21 Basic Control Valve is ideally suited for applications in large water transmission mains, distribution zone entries, and any system requiring a reliable, custom-configured main valve body capable of being controlled by specialized pilot accessories. Its superior hydraulic performance and versatile platform make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for long-term critical flow control and customized system design.
In summary, the DCT21 Basic Control Valve offers an optimal combination of operational flexibility, robust hydraulic capacity, and modular design adaptability. With its reliable diaphragm actuation, durable construction, and focus on providing a versatile control base, this unit stands as a trusted solution for modern fluid control and complex network requirements worldwide.
1. General Information
The DCT21 Basic Control Valve is designed for integration into a control loop, acting as the main throttling and isolation element. Proper installation, including securing isolation valves, is essential to guarantee safe operation, long service life, and accurate control response.
2. Safety Precautions
Installation must be performed by qualified personnel only.
Ensure strict compliance with all local safety regulations and standards concerning working with pressurized pipelines and intricate hydraulic systems.
Wear appropriate personal protective equipment (PPE).
Confirm that the pipeline section and all pilot lines are fully depressurized, isolated, and drained before attempting to install the DCT21 Basic Control Valve.
3. Pre-Installation Checklist
Inspect the DCT21 Basic Control Valve for any visible damage during transport or storage, paying attention to the main diaphragm housing and end flanges.
Check that the valve type, size, and pressure rating match the system requirements.
Verify that the valve interior and diaphragm chamber 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 above the valve for pilot installation and main cover removal during maintenance.
4. Installation Procedure
Positioning: Install the DCT21 Basic Control Valve ensuring the flow direction adheres to the arrow cast on the body.
The valve should be installed with dedicated isolation valves on either side and the necessary tapping points for the external pilot circuit.
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.
Do not exceed the specified torque to prevent stress on the valve body.
5. Post-Installation
Slowly reintroduce fluid and pressurize the system, checking immediately for leaks around the flange connections and the main cover.
If leakage is detected, depressurize the system immediately and re-tighten the bolts following the cross-pattern sequence.
Proceed with the installation and connection of the external pilot control loop (not supplied with the basic valve).
Record the installation details, direction of flow, and final notes for documentation purposes.
Proper maintenance extends the service life of the DCT21 Basic Control Valve and ensures continuous, reliable hydraulic performance. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Visually inspect the DCT21 Basic Control Valve exterior and its connected pilot line tapping points regularly (e.g., monthly) for signs of external leakage, vibration, or corrosion.
Monitor the valve’s stability during operation to detect any unexpected oscillations or erratic modulation.
2. Inspection Schedule
Monthly, check the area surrounding the valve for any signs of external leakage.
Quarterly, check the function of the main valve by observing its opening and closing stroke (controlled by the pilot system).
Annually, perform a detailed internal inspection by removing the main cover to check the condition of the diaphragm, seating surface, and stem seals for wear or pitting, replacing the diaphragm if fatigue is present.
3. Lubrication
The DCT21 Basic Control Valve utilizes fluid-lubricated internal parts (water) and typically requires no external lubrication.
The stem guides and other internal components should be kept clean to ensure smooth diaphragm movement.
4. Seal and Gasket Replacement
Replace the main cover/diaphragm gasket and any external connection seals immediately if leakage is observed.
The main valve seat and disc seals should be replaced if control fails (i.e., the valve leaks through when attempting to close).
Always isolate the valve and fully depressurize and drain the line before attempting any maintenance work requiring cover removal.
5. Cleaning
Keep the exterior of the DCT21 Basic Control Valve clean to prevent surface corrosion.
If the valve is disassembled, clean all internal guiding surfaces and the diaphragm chamber carefully to ensure precision hydraulic response.
6. Storage and Spare Parts
Store spare parts (diaphragms, pilot kits, gaskets) in a dry, clean, and cool environment, away from direct sunlight and temperature extremes.
Maintain a detailed record of all inspections, operational tests, and repairs performed on the DCT21 Basic Control 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 DCT21?
What are the main advantages of this valve?
The DCT21 Basic Control Valve offers unmatched modularity, serving as a flexible platform that can be hydraulically configured to perform virtually any control function (PRV, Sustaining, Surge Relief) simply by adding the required external pilot components.
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.
Is the DCT21 Basic Control Valve ready to operate immediately after installation?
No. The DCT21 Basic Control Valve requires the connection of an external pilot circuit (which consists of sensing lines, needle valves, and a specific pilot regulator) before it can perform any automated control function.
How does the DCT21 Basic Control Valve achieve flow control?
The valve achieves flow control via the movement of the main valve diaphragm/disc assembly. The position of the disc is hydraulically balanced and dictated by the pressure directed to the main chamber by the external pilot system.
Can the DCT21 Basic Control Valve be used as a simple on/off isolation valve?
Yes. While it is designed for modulation, the DCT21 Basic Control Valve can be configured as an ON/OFF isolation valve by using a simple external 2-way solenoid pilot to either fully pressurize or fully drain the diaphragm chamber.
Contact Devinsan
Reach out to our team for inquiries, quotes, and technical assistance