DN125 Flange Rubber Bellows
The DN125 Flange Rubber Bellows is a DN125 corrugated rubber connector with flanged ends for joining pipes and equipment. It is used in pump rooms, commercial HVAC circuits, water-treatment equipment, chemical utility lines, and process skids that use DN125 connections.
Description
DN125 flange rubber bellows
Product Overview
The DN125 Flange Rubber Bellows is a DN125 corrugated rubber connector with flanged ends for joining pipes and equipment. It is used in pump rooms, commercial HVAC circuits, water-treatment equipment, chemical utility lines, and process skids that use DN125 connections.
Core Specifications and Parameters
|
Parameter Item |
Index Details |
|
Product Model |
REJ |
|
Nominal Diameter |
DN125 (customizable with DN15-DN4000 full series diameters) |
|
Working Pressure |
PN6-PN40 |
|
Connection Method |
Flange connection |
|
Flange Standard |
Customizable for DIN, JIS, ANSI, GB |
|
Flange Material |
Carbon steel, SS304, SS316, ductile iron |
|
Rubber Material |
EPDM, NR, NBR, PTFE lining optional |
|
Working Temperature |
-15~+80℃, customizable to -30~+150℃ for special rubber |
|
Test Pressure |
1.5 times the working pressure |
|
Burst Pressure |
2 times the working pressure |
|
Applicable Media |
Tap water, compressed air, engine oil, weak acid and weak base solution |
|
Warranty Period |
12 months |
|
Customization Service |
OEM branding, lengthened corrugation, thickened pressure bearing structure customization |
Core Advantages
1. Continuous DN125 corrugated profile. Multiple convolutions distribute lateral offset over the complete flexible length instead of concentrating movement in one short sphere. At DN125 pump outlets and equipment branches where flange centers shift during operation, the bellows absorbs the offset without twisting the bolted connection.
2. Reinforcement follows every convolution. Polyamide cord extends through the corrugation peaks and valleys, controlling local diameter growth during repeated pressure cycles. This load distribution keeps one convolution from carrying the full deformation when pressure pulsation and thermal movement occur together.
3. Compact DN125 connection with PN6 to PN40 construction. The fixed nominal bore fits existing DN125 equipment while the reinforced wall matches the specified line pressure. In retrofit pump rooms and process skids, the joint adds movement capacity without changing the mating pipe diameter or adding a long spool section.
Customization Capabilities
- Installed length: Face-to-face length and corrugation count can be adjusted while retaining the DN125 bore.
- Media compatibility: EPDM, NBR, or a PTFE-lined bore is selected for the conveyed fluid and temperature.
- Flange interface: DIN, JIS, ANSI, or GB drilling is available in carbon steel or SS304/SS316.
Quality Control
flange alignment, thenThe DN125 flange bolt circle, hole diameter, sealing face, and overall length are measured against the approved drawing. Cord placement is checked at the corrugation peaks and valleys before vulcanization. Cure parameters are recorded for each batch. Finished bellows are inspected for uniform convolution depth and hydrostatically tested at 1.5 times working pressure. Design verification uses a burst pressure of twice working pressure, and packing begins only after 100% final inspection.
FAQ
Q: Can a DN125 sample be supplied before mass production?
A: Yes. A standard DN125 sample can be supplied. A newly developed length, flange pattern, or lining normally requires 15 to 20 days.
Q: How long does a custom DN125 order take?
A: Custom-made products normally require 40 to 50 days after drawings and materials are approved. Repeat configurations can be scheduled faster.
Q: Can the bellows be installed immediately beside a pump?
A: Yes, provided the pump and adjacent pipe are independently supported and the joint is not exposed to unrestrained pressure thrust.
Q: Can DN125 DIN and ANSI flanges be interchanged?
A: No. Bolt circles, hole counts, and sealing dimensions differ. The flange standard must match the mating pipeline drawing.
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