DN350 Rubber Expansion Joint
The DN350 Rubber Expansion Joint is a DN350 flanged rubber connector for large-bore piping systems. It is used in municipal water mains, sewage-treatment pipelines, pump stations, industrial cooling-water circuits, and large HVAC headers.
Description
DN350 rubber expansion joint
Product Overview
The DN350 Rubber Expansion Joint is a DN350 flanged rubber connector for large-bore piping systems. It is used in municipal water mains, sewage-treatment pipelines, pump stations, industrial cooling-water circuits, and large HVAC headers.
Core Specifications and Parameters
|
Parameter Item |
Index Details |
|
Product Model |
REJ |
|
Nominal Diameter |
DN15-DN4000 (main specification: DN350) |
|
Working Pressure |
PN6-PN40 (adaptable to high-pressure working conditions) |
|
Connection Method |
Flange connection |
|
Flange Standard |
DIN, JIS, GB, ANSI, etc. (customizable on demand) |
|
Flange Material |
SS304, SS316, carbon steel, ductile iron, etc. |
|
Rubber Material |
EPDM, NR, NBR, PTFE lining, etc. |
|
Working Temperature |
-15~+80℃ (customizable to -30~+150℃ for special working conditions) |
|
Test Pressure |
1.5 times the working pressure |
|
Burst Pressure |
2 times the working pressure |
|
Applicable Media |
Water, oil, gas, weak acid and alkali, etc. |
|
Warranty Period |
12 months |
|
Customization Service |
OEM/ODM, support production according to drawings |
Core Advantages
1. Reinforced DN350 pressure body. Multiple nylon-cord layers and embedded wire control the large flexible surface created by the DN350 sphere. During pump starts and pressure fluctuation, the reinforcement restrains radial growth and distributes hydraulic load away from the flange neck.
2. Large-bore three-direction movement. The DN350 profile absorbs axial compression, lateral offset, and angular deflection without reducing the full pipe bore. In municipal water, sewage, and cooling-water headers affected by thermal growth or foundation movement, the joint reduces bending load on pumps, valves, and rigid supports.
3. Rotating flange alignment for heavy pipework. A rotating flange positions the bolt holes without twisting the rubber sphere. During installation between fixed DN350 pipe ends, the flange aligns with the mating bolt circle while the flexible body remains in its neutral, untorqued position.
Customization Capabilities
- DN350 interface: Face-to-face length and DIN, JIS, ANSI, or project drilling are matched to the existing large-bore line.
- Structural reinforcement: Cord layers, embedded wire, vacuum support, and control rods are configured from the pressure and restraint data.
- Material selection: EPDM, NR, or NBR and carbon-steel or stainless-steel flanges are selected for the medium and site environment.
Quality Control
The DN350 body is checked for reinforcement symmetry, flange-bead thickness, and sphere concentricity before vulcanization. Rubber compound cure characteristics and cord placement are recorded by batch. Flange bolt circle, hole size, thickness, and face flatness are measured against the approved drawing. Finished joints undergo 100% hydrostatic testing at the specified test pressure, leak inspection, and movement clearance checks. Control-rod assemblies are adjusted and locked before packing when included.
FAQ
Q: Can a DN350 sample be supplied before production?
A: Yes. A sample or first-article unit can be produced after the flange drawing and working conditions are approved. A newly developed configuration normally requires 15 to 20 days.
Q: How is a DN350 joint packed for export?
A: The joint receives individual moisture and impact protection, flange-face covers, internal fixing, and a reinforced wooden case to prevent deformation during handling.
Q: Are control rods recommended for DN350?
A: They are recommended where pressure thrust is not fully restrained, at pump outlets, or where the piping layout could extend the joint beyond its rated movement.
Q: Can DN350 be used under vacuum?
A: Yes, with a vacuum-rated wall and internal support arrangement selected for the specified negative pressure. A standard pressure-only body should not be assumed suitable for suction service.
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