DCT20 Manual Control Valve
Devinsan offers reliable fine-tuning components engineered for precise, human-controlled modulation of flow and pressure in hydraulic pilot systems and auxiliary circuits. Designed for consistent manual adjustment and exceptional durability, these DCT20 Manual Control Valve units provide robust threaded control to meet the crucial demands of modern industrial and high-performance fluid regulation.
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 DCT20 Manual 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 DCT20 Manual Control Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DCT20 Manual Control Valve is a key component specifically engineered for fine-tuning the hydraulic control signal within the pilot circuit of a larger diaphragm-operated main valve. Designed to meet the stringent demands of modern infrastructure, this specialized valve ensures highly accurate manual flow regulation, outstanding reliability, and long-term durability in systems requiring operator intervention for specific process adjustments.
At the core of the DCT20 Manual Control Valve is its precise stem-and-seat mechanism, often featuring a globe or needle configuration. This design allows the operator to linearly adjust the flow area by turning a handwheel, thereby controlling the speed of a main valve (e.g., controlling the opening or closing rate) or setting a hydraulic pressure bias. This high level of manual control is essential for complex start-up or critical throttling duties.
Manufactured from high-strength, corrosion-resistant materials and built with a robust, compact body, the DCT20 Manual Control Valve is designed to withstand continuous system pressure and manual torque inputs. Its small size allows for secure installation directly onto the main valve cover or within a compact manifold. The precision thread ensures that any adjustment made by the operator is maintained reliably against fluctuating system pressures.
The DCT20 Manual Control Valve is ideally suited for applications in bypass lines for filter backwash systems, on the control lines of pressure-reducing valves (as a maximum flow limiter), and anywhere manual, non-automated throttling is essential for process integrity. Its superior modulation capability and secure design make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for long-term critical process fine-tuning and hydraulic stabilization.
In summary, the DCT20 Manual Control Valve offers an optimal combination of operational simplicity, high adjustment precision, and robust hydraulic control. With its fine-threaded stem mechanism, durable construction, and focus on stable manual modulation, this unit stands as a trusted solution for modern fluid control and auxiliary hydraulic requirements worldwide.
1. General Information
The DCT20 Manual Control Valve is designed for integration into the hydraulic circuit of a larger main control valve, requiring precise setting and reliable connection. Proper installation is essential to guarantee safe operation, long service life, and accurate flow adjustment.
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 pilot systems and small-bore fittings.
Wear appropriate personal protective equipment (PPE).
Confirm that the main valve and all pilot lines are fully depressurized and isolated before attempting to install the DCT20 Manual Control Valve.
3. Pre-Installation Checklist
Inspect the DCT20 Manual Control Valve for any visible damage during transport or storage, paying attention to the handwheel and stem assembly.
Check that the valve type, size, and pressure rating match the pilot system requirements.
Verify that the valve interior and threads are clean and free from debris.
Confirm that the mating hydraulic ports are clean and properly aligned for connection.
Ensure the handwheel has sufficient clearance for full rotation and is easily accessible by the operator.
4. Installation Procedure
Positioning: Install the DCT20 Manual Control Valve by mounting it securely in the designated position (e.g., on the main valve cover or manifold).
Ensure the hydraulic ports are correctly connected to the pilot lines as per the hydraulic schematic.
Use the appropriate thread sealant or ferrules suitable for the pilot tubing connections.
Align the valve precisely and secure it firmly.
Do not over-tighten the packing nut unnecessarily, as this may hinder manual adjustment.
5. Post-Installation
Slowly reintroduce fluid pressure into the pilot system, checking immediately for leaks around the connections.
If leakage is detected, depressurize the system immediately and re-tighten the connections.
Verify the valve’s zero-point (fully closed) and fully-open range by turning the handwheel, confirming smooth action.
Record the installation details, initial operational setting, and final notes for documentation purposes.
Proper maintenance extends the service life of the DCT20 Manual Control Valve and ensures reliable flow adjustment and sealing. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Visually inspect the DCT20 Manual Control Valve exterior and pilot line tubing regularly (e.g., monthly) for signs of external leakage, especially around the stem and packing gland.
Operate the valve periodically (open and close) to ensure the stem threads remain clean and the valve operates smoothly throughout its full range of adjustment.
2. Inspection Schedule
Monthly, check the pipe threads and fitting connections for signs of loosening or leakage.
Quarterly, check the security of the handwheel and stem assembly; ensure the stem is not bent or corroded.
Annually, perform an internal inspection by disassembling the stem/bonnet section (after isolating and depressurizing) to check the condition of the sealing element and seat.
3. Lubrication
The stem threads and packing area of the DCT20 Manual Control Valve require periodic lubrication to ensure smooth, low-torque manual adjustment.
Use only the recommended water-safe or media-compatible grease on the exposed stem threads.
4. Seal and Gasket Replacement
Replace the packing material and any body seals immediately if external leakage is observed.
The valve seat or disc seal should be replaced if internal leakage (flow when closed) is detected during a pressure test.
Always isolate the valve and fully depressurize and drain the pilot lines before attempting any maintenance work.
5. Cleaning
Keep the exterior of the DCT20 Manual Control Valve clean, paying attention to the exposed stem threads and handwheel area to prevent dirt ingress.
If the valve is disassembled, clean the internal seating surfaces and guiding components carefully to ensure precise hydraulic performance.
6. Storage and Spare Parts
Store spare parts (packing sets, seats, handwheels) 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 DCT20 Manual 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 DCT20?
What are the main advantages of this valve?
The DCT20 Manual Control Valve provides fine, mechanical adjustment of fluid flow in pilot lines, offering superior precision and repeatability for setting the hydraulic balance or operational speed of a larger main control valve.
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 primary use of the DCT20 Manual Control Valve in a main control valve system?
The primary use is to set the opening and closing speed of the main control valve, or to manually adjust the pressure ratio or flow limit within the valve’s pilot loop.
Can the DCT20 Manual Control Valve be used to completely isolate the main pipeline?
No. The DCT20 Manual Control Valve only isolates the small pilot lines. A separate, dedicated isolation valve (e.g., a gate valve or ball valve) must be installed on the main pipeline for full system isolation.
What is the benefit of the fine-threaded stem mechanism in the DCT20 Manual Control Valve?
The fine-threaded stem mechanism ensures highly gradual movement of the disc/needle, which provides the operator with superior control and sensitivity when setting precise flow rates, ensuring stable, non-oscillating hydraulic modulation.
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