DCT17 Pressure Reducing Sustaining Control Valve
Devinsan offers advanced dual-function hydraulic solutions engineered for simultaneous management of upstream stability and downstream safety in critical transfer systems. Designed for optimal pump protection and network integrity, these DCT17 Pressure Reducing Sustaining Control Valve units utilize complex pilot mechanics to meet the crucial demands of modern municipal and large industrial water conveyance.
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 DCT17 Pressure Reducing Sustaining 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 DCT17 Pressure Reducing Sustaining Control Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DCT17 Pressure Reducing Sustaining Control Valve is a sophisticated, hydraulically-operated valve specifically engineered to perform two critical control functions simultaneously: maintaining a minimum upstream (inlet) pressure while automatically reducing the pressure to a constant, lower downstream (outlet) set point. Designed to meet the stringent demands of modern infrastructure, this valve ensures comprehensive system protection and optimal operational stability.
At the core of the DCT17 Pressure Reducing Sustaining Control Valve is its diaphragm-actuated main valve controlled by a complex dual-pilot system. One pilot ensures the upstream pressure never falls below a set minimum (sustaining function), which is vital for pump protection and preventing cavitation. The second pilot ensures the downstream pressure never exceeds a set maximum (reducing function), protecting fixtures and pipes below.
Manufactured from high-strength, corrosion-resistant materials (such as ductile iron) and built with a robust, globe-style body, the DCT17 Pressure Reducing Sustaining Control Valve is designed to withstand continuous high pressure and dynamic operational forces. The ability to perform both reducing and sustaining duties with one main valve simplifies installation and reduces the overall system footprint and component count.
The DCT17 Pressure Reducing Sustaining Control Valve is ideally suited for applications immediately downstream of pump stations (preventing pump dead-heading and high discharge pressure), on transfer lines from high-level tanks, and in zones where the system must simultaneously feed a high-level area and a low-level area. Its superior dual-regulation characteristics and dependable operation make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for complex network management.
In summary, the DCT17 Pressure Reducing Sustaining Control Valve offers an optimal combination of supply-side stability, demand-side pressure reduction, and robust system integrity. With its pilot-operated mechanism, dual-control system, and focus on two-way hydraulic management, this unit stands as a trusted solution for modern fluid control and complex network requirements worldwide.
1. General Information
The DCT17 Pressure Reducing Sustaining Control Valve is designed for the accurate, automatic regulation and switching between two distinct downstream pressure settings. Proper installation is essential to guarantee safe operation, long service life, and efficient system performance.
2. Safety Precautions
Installation must be performed by qualified personnel only.
Ensure strict compliance with all local safety regulations and standards concerning working with high-pressure pipelines and intricate pilot 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 DCT17 Pressure Reducing Sustaining Control Valve.
3. Pre-Installation Checklist
Inspect the DCT17 Pressure Reducing Sustaining Control Valve for any visible damage during transport or storage, paying attention to the main diaphragm housing, both pilot valves, and pilot tubing integrity.
Check that the valve type, size, and pressure rating match the system requirements and both required set points (P-In minimum and P-Out maximum).
Verify that the valve interior and pilot line strainers 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 both pilot mechanisms are correctly calibrated to the required high and low set points before commissioning.
4. Installation Procedure
Positioning: Install the DCT17 Pressure Reducing Sustaining Control Valve ensuring the flow direction adheres to the arrow cast on the body.
The valve must be installed with dedicated isolation valves on either side and a bypass line for redundancy.
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.
Wire the solenoid coil to the electrical control system according to the specified voltage and functionality.
5. Post-Installation
Slowly open the upstream isolation valve to reintroduce fluid and pressurize the system, checking immediately for leaks around the flange connections and the pilot tubing.
If leakage is detected, depressurize the system immediately and re-tighten the bolts or connections following the cross-pattern sequence.
Verify the solenoid’s electrical command correctly switches the downstream pressure between the high and low set points.
Record the installation details, set pressures, and final notes for documentation purposes.
Proper maintenance extends the service life of the DCT17 Pressure Reducing Sustaining Control Valve and ensures continuous, accurate dual-point pressure regulation. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Visually inspect the DCT17 Pressure Reducing Sustaining Control Valve exterior, pilot line tubing, and electrical conduit regularly (e.g., monthly) for signs of external leakage, vibration, or corrosion.
Monitor the system pressure closely to confirm the valve maintains both the primary and secondary set points accurately upon electrical command.
2. Inspection Schedule
Monthly, check the pilot system strainers and filters for fouling and clean them to ensure accurate pressure sensing.
Quarterly, check the security of the solenoid coil and wiring connections; ensure the coil housing remains dry and undamaged.
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.
3. Lubrication
The DCT17 Pressure Reducing Sustaining Control Valve utilizes fluid-lubricated internal parts (water).
External stem threads or guides (if applicable) may require periodic lubrication; use only recommended grease types.
4. Seal and Gasket Replacement
Replace the main cover/diaphragm gasket and pilot tubing seals immediately if external leakage is observed.
The main valve seat and disc seals should be replaced if pressure control fails (i.e., the valve leaks through or cannot maintain the set point).
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 DCT17 Pressure Reducing Sustaining Control Valve clean to prevent surface corrosion.
If the valve is disassembled, clean all internal guiding surfaces and the pilot line components carefully to ensure precision hydraulic response.
6. Storage and Spare Parts
Store spare parts (diaphragms, pilot kits, solenoids, gaskets) in a dry, clean, and cool environment, away from direct sunlight and temperature extremes.
Maintain a detailed record of all inspections, pressure tests, and repairs performed on the DCT17 Pressure Reducing Sustaining 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 DCT17?
What are the main advantages of this valve?
The DCT17 Pressure Reducing Sustaining Control Valve provides comprehensive pump protection (sustaining) and network stability (reducing) using a single main valve, minimizing installation complexity while ensuring both upstream and downstream hydraulic needs are met.
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.
When is the sustaining function of the DCT17 Pressure Reducing Sustaining Control Valve active?
The sustaining function is active when the inlet (upstream) pressure begins to drop below the set minimum. The valve will automatically restrict flow to prevent the inlet pressure from falling further, protecting the pump from cavitation.
How does the DCT17 Pressure Reducing Sustaining Control Valve handle low flow or no flow conditions?
Under low-flow conditions, the valve remains closed until the upstream pressure builds to the sustaining set point. When open, the reducing pilot ensures the downstream pressure is never exceeded, providing excellent stability across the entire flow range.
Why is this dual function valve often installed downstream of a pump?
It is often installed downstream of a pump to prevent the pump from “dead-heading” (high-pressure/low-flow damage) by sustaining a minimum back pressure, while simultaneously reducing that high pressure to a safe level for the consumer network.
Contact Devinsan
Reach out to our team for inquiries, quotes, and technical assistance