DDJ11 Telescopic Dismantling Joint
Devinsan specializes in high-strength pipe fittings that simplify the installation and removal of valves and pumps in pressurized systems. Engineered for lasting reliability and secure sealing, our DDJ11 Telescopic Dismantling Joint provides essential axial travel and flange alignment flexibility, crucial for efficiency in modern water and industrial projects.
Production Standard
Nominal Dimension (DN)
Nominal Pressure (PN)
Operating Temperature
Connection
Coating
Testing
DN 40 – DN 2600
PN 6-PN 10-PN 16-PN 25-PN 40
-30° / +200°
EN 1092-2 ISO7005-2 Flanged
Electrostatic Powder Epoxy
EN 12266-1
Application Areas
The DDJ11 Telescopic Dismantling Joint 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 DDJ11 Telescopic Dismantling Joint ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DDJ11 Telescopic Dismantling Joint is a high-performance flanged fitting specifically engineered for axial adjustment and secure component anchoring within rigid pipeline systems. Designed to meet the critical demands of modern infrastructure, this joint provides essential installation flexibility, ensuring exceptional sealing performance and long-term operational reliability in pump stations and treatment facilities.
At the core of the DDJ11 Telescopic Dismantling Joint is its wide-range axial sliding capability, which easily compensates for minor pipe misalignment, bridging gaps during installation, or providing the necessary length for equipment removal. This robust design guarantees simple and quick installation by eliminating the need for precise pipe length measurements. The internal gasket system ensures a permanent, bubble-tight seal against system pressures.
Manufactured from corrosion-resistant materials and built with a rugged ductile iron body, the DDJ11 Telescopic Dismantling Joint is designed to withstand continuous high pressure and challenging burial environments, including direct burial applications. Its unique ability to secure and seal simultaneously upon tightening the tie-rods reduces stress on valves and pumps, ensuring positive, long-term flange alignment.
The DDJ11 Telescopic Dismantling Joint is ideally suited for applications in municipal pump houses, water treatment plant manifolds, and industrial flow control systems where equipment needs regular maintenance or replacement. Its versatility and reliable performance make it a preferred choice for engineers and project managers seeking a simple, standards-compliant solution that significantly shortens installation and repair times.
In summary, the DDJ11 Telescopic Dismantling Joint offers an optimal combination of axial adjustment capability, durability, and simplified field maintenance. With its robust tie-rod mechanism, high-grade materials, and secure sealing system, this unit stands as a trusted solution for modern infrastructure connection requirements worldwide.
1. General Information
The DDJ11 Telescopic Dismantling Joint is designed for the safe and simple installation of new flanged equipment into existing pipeline systems. Proper installation is essential to guarantee safe operation, long service life, and sustained leak-free performance.
2. Safety Precautions
Installation must be performed by qualified personnel only.
Ensure strict compliance with all local safety regulations and standards concerning pipeline pressure and equipment handling.
Wear appropriate personal protective equipment (PPE).
Confirm that the pipeline section is fully depressurized and drained before attempting to install the DDJ11 Telescopic Dismantling Joint.
3. Pre-Installation Checklist
Inspect the DDJ11 Telescopic Dismantling Joint for any visible damage during transport or storage.
Check that the joint type, size, and pressure rating match the system requirements.
Verify that all sealing surfaces are clean and free from debris.
Confirm that the mating flange faces on the pipeline and component are properly aligned and parallel.
Ensure sufficient space is available to operate the joint’s tie-rods and insert the component.
4. Installation Procedure
Positioning: Insert the DDJ11 Telescopic Dismantling Joint into the gap between the two pipeline flanges or between the pipe flange and the flanged component (e.g., pump, valve).
Adjust the joint’s telescopic feature to align with the mating flanges, ensuring the joint is centred.
Insert the bolts through the flanges and secure the tie-rods, tightening them sequentially and evenly to compress the rubber gasket.
Ensure the final tightening torque is applied in a cross-pattern to achieve a uniform, bubble-tight seal.
5. Post-Installation
Slowly pressurize the system after installation and carefully check for leaks around the flange connections and the internal gasket area.
If leakage is detected, depressurize the system immediately and re-tighten the tie-rods using the specified torque values.
Record the installation details, date, and final torques for documentation purposes.
Proper maintenance extends the service life of the DDJ11 Telescopic Dismantling Joint and ensures reliable performance. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Inspect the DDJ11 Telescopic Dismantling Joint externally at least semi-annually for signs of external corrosion or visible joint movement beyond specification.
Periodically check the tightness of the tie-rods to ensure the joint compression is maintained, particularly after initial settling or pressure cycling.
2. Inspection Schedule
Monthly, check the joint exterior for signs of external leakage, especially around the main sealing areas.
Quarterly, inspect the exposed metal surfaces of the tie-rods and flanges for corrosion or coating damage.
Annually, perform a detailed inspection of the tie-rod integrity and overall joint alignment.
3. Lubrication
The DDJ11 Telescopic Dismantling Joint does not require internal lubrication.
However, external thread lubrication (e.g., grease) should be applied to the tie-rod nuts before final tightening to prevent seizing and ensure accurate torque application.
4. Seal and Gasket Replacement
The primary sealing gasket should only require replacement if persistent leakage occurs or if the connected equipment is being replaced.
Always depressurize and drain the pipeline thoroughly before attempting to loosen the tie-rods or access the gasket.
Only use original spare parts to guarantee perfect compatibility and long-term reliability.
5. Cleaning
Keep the exterior of the DDJ11 Telescopic Dismantling Joint clean to prevent surface corrosion, which can be accelerated by environmental factors or buried conditions.
In aggressive burial environments, confirm that the protective coating remains intact and consider applying supplemental protection if necessary.
6. Storage and Spare Parts
Store spare parts (gaskets, seals) in a dry, clean, and cool environment, away from direct sunlight and harsh chemicals.
Maintain a detailed record of all inspections, repairs, and replacements performed on the DDJ11 Telescopic Dismantling Joint 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 DDJ11?
What are the main advantages of this product?
The DDJ11 Telescopic Dismantling Joint offers crucial flexibility for maintenance by providing variable length adjustment, simplifying the installation and removal of in-line equipment such as pumps and flow meters. Its design ensures a reliable, permanent seal after reassembly.
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 function of the DDJ11 Telescopic Dismantling Joint?
The primary function is to bridge gaps between flanges and to allow longitudinal movement, which simplifies the assembly and disassembly of flanged components in a rigid pipeline system, ensuring that maintenance access is quick and precise.
Can the DDJ11 Telescopic Dismantling Joint absorb pipeline movement?
While the DDJ11 Telescopic Dismantling Joint allows for initial installation flexibility and longitudinal adjustment, it is not designed to permanently absorb large movements (like seismic or thermal expansion). It primarily secures the installation alignment.
How is a watertight seal achieved?
A watertight seal is achieved by tightening the tie-rods, which compresses a wide internal rubber sealing gasket between the central sleeve and the end flanges, locking the DDJ11 Telescopic Dismantling Joint in its final, secured position.
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