DOP10 Plunger Valve
Devinsan offers specialized flow regulation solutions engineered for high-accuracy throttling and controlled energy dissipation in severe high-pressure applications. Designed for maximum hydraulic stability and precise pressure reduction, these DOP10 Plunger Valve units utilize a unique plunger-and-seat mechanism to meet the critical demands of modern water works and hydroelectric systems.
Production Standard
Nominal Dimension (DN)
Nominal Pressure (PN)
Operating Temperature
Design
Face to Face
Connection
Coating
Testing
DN 80 – DN 2400
PN 6-PN 10-PN 16-PN 25-PN 40
-30° / +200°
EN 593
EN 558 Series 15 – DIN 3202 F5
EN 1092-2 ISO7005-2 Flanged
Electrostatic Powder Epoxy
EN 12266-1
Operation Versions
The DOP10 Plunger Valve can be operated with a range of compatible accessories to suit different installation and automation requirements:
1. DVA10 Surface Box & Extension Spindle
2. DVA11 Telescopic Extension Spindle
3. DVA12 Electric Actuators
4. DVA13 Pneumatic Actuators
5. DVA14 Gear Box
6. DVA15 HandWheel
These accessories allow the valve to be adapted for manual, geared, pneumatic, or electric operation, ensuring precise control and reliable performance in both industrial and commercial systems.
Application Areas
The DOP10 Plunger 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 DOP10 Plunger Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DOP10 Plunger Valve (also known as a Needle Valve or Howell-Bunger Valve in some configurations) is a high-performance flow control valve specifically engineered for regulating high differential pressures and flow rates in water transmission mains. Designed to meet the stringent demands of modern infrastructure, this specialized valve delivers highly accurate discharge control, exceptional reliability, and long-term durability in reservoir discharge and hydroelectric power plants.
At the core of the DOP10 Plunger Valve is its hydraulically balanced piston (plunger) which moves axially within the valve body, regulating flow through a precisely contoured annular seat. This mechanism ensures extremely accurate control of the fluid velocity and pressure, minimizing the destructive effects of cavitation and noise typically encountered during severe throttling duties. The design results in energy being dissipated smoothly, enhancing overall system stability.
Manufactured from high-strength, corrosion-resistant materials and built with a robust, heavy-duty body, the DOP10 Plunger Valve is designed to withstand continuous high velocity, high-pressure flow, and extreme dynamic forces. Its optimized geometry minimizes turbulence and vibration, ensuring secure installation into critical pipeline sections. The precise guiding of the plunger significantly maintains the seal integrity and minimizes maintenance costs associated with wear in high-stress applications.
The DOP10 Plunger Valve is ideally suited for applications in reservoir outlet works, major pressure reducing stations, pump bypass lines, and anywhere flow must be accurately modulated and pressure safely dissipated across a large differential. Its superior cavitation management and dependable regulation make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for long-term flow management and system protection.
In summary, the DOP10 Plunger Valve offers an optimal combination of highly accurate flow modulation, reliable pressure dissipation, and robust protection against cavitation damage. With its hydraulically balanced plunger mechanism, durable construction, and focus on steady control, this unit stands as a trusted solution for modern fluid control and energy management requirements worldwide.
1. General Information
The DOP10 Plunger Valve is designed for precise throttling and flow regulation duties in high-pressure pipelines. Proper installation is essential to guarantee safe operation, long service life, and efficient energy dissipation.
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 energy dissipation equipment.
Wear appropriate personal protective equipment (PPE).
Confirm that the pipeline section is fully depressurized, isolated, and drained before attempting to install the DOP10 Plunger Valve.
3. Pre-Installation Checklist
Inspect the DOP10 Plunger Valve for any visible damage during transport or storage, paying attention to the sealing rings and the plunger surface finish.
Check that the valve type, size, and pressure rating match the system requirements and the required throttling characteristics.
Verify that the valve interior is clean and free from debris that could damage the seat or plunger surface.
Confirm that the mating pipeline flanges are properly aligned (parallel and concentric) and free from rotational strain. Ensure sufficient space is available for actuator access and removal of the bonnet/plunger assembly during maintenance.
4. Installation Procedure
Positioning: Install the DOP10 Plunger Valve ensuring the flow direction matches the arrow cast on the valve body. The valve must be installed with careful support to prevent strain from the heavy body transferring to the pipe flanges.
Use the appropriate high-pressure 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 bonnet seals. If leakage is detected, depressurize the system immediately and re-tighten the bolts following the cross-pattern sequence. Verify the actuator stroke and calibration according to the required flow curve. Record the installation details, date, and final bolt torques for documentation purposes.
Proper maintenance extends the service life of the DOP10 Plunger Valve and ensures reliable flow modulation and cavitation protection. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Visually inspect the DOP10 Plunger Valve exterior regularly (e.g., monthly) for signs of external leakage, especially around the plunger stem packing area. Listen for unusual noise or vibration during throttling, which may indicate incipient cavitation or seat erosion.
2. Inspection Schedule
Monthly, check the area surrounding the valve for any signs of external leakage.
Quarterly, check the function and security of the actuator assembly and ensure the handwheel operates smoothly.
Annually, perform a detailed internal inspection by removing the bonnet assembly to check the plunger surface, the seat sealing rings, and the condition of the internal guiding components.
3. Lubrication
The plunger stem and guides may require periodic lubrication according to the manufacturer’s specifications to ensure smooth, low-friction axial movement. Use only the recommended grease type and application method.
4. Seal and Gasket Replacement
Replace the bonnet gaskets and stem packing immediately if external leakage is observed during high-pressure operation. The seat sealing rings or plunger sealing surfaces should be inspected and replaced if wear is detected, as this compromises throttling accuracy. Always isolate the valve and fully depressurize and drain the line before attempting any maintenance work requiring bonnet removal.
5. Cleaning
Keep the exterior of the DOP10 Plunger Valve clean to prevent surface corrosion. If the valve is disassembled, clean all internal guiding surfaces and the plunger surface carefully to ensure precision movement upon reassembly.
6. Storage and Spare Parts
Store spare parts (gaskets, seals, seat rings) in a dry, clean, and cool environment, away from direct sunlight and temperature extremes. Maintain a detailed record of all inspections, internal part replacements, and repairs performed on the DOP10 Plunger 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 DOP10?
What are the main advantages of this valve?
The DOP10 Plunger Valve excels in high-energy applications by providing precise, linear control over fluid flow and offering excellent management of cavitation effects, ensuring long-term protection of the valve and downstream piping from erosion damage.
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 makes the DOP10 Plunger Valve ideal for throttling high pressure?
The design uses the movement of the contoured plunger within the annular seat to gradually change the flow area, preventing sudden pressure drops and directing high-velocity flow away from the sealing surfaces, thus resisting cavitation and erosion.
How does the hydraulically balanced plunger assist in valve operation?
The plunger is hydraulically balanced, meaning the pressure forces on the upstream and downstream faces are nearly equal. This significantly reduces the force required by the actuator or handwheel to move the plunger, resulting in easier and more precise operation, especially under high pressure.
Can the DOP10 Plunger Valve be used as a tight shut-off isolation valve?
While the DOP10 Plunger Valve can provide good shut-off, its primary function is accurate flow modulation. For absolute, bubble-tight isolation, a separate dedicated isolation valve (e.g., a gate valve) is usually recommended upstream for redundancy during maintenance.
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