Oil and Acid Resistant Pn16 Carbon Steel Flexible Concentric Reducer Rubber Coupling
A concentric but differently sized rubber expansion joint is a flexible compensating element used for connecting pipes of different diameters. The centerlines of its two flanges coincide (concentric), but the diameters are different (DN200 to DN150). It compensates for displacement through its rubber body.
Key Features:
- Good elasticity for vibration and noise reduction
- SS304 flange connection
- Single sphere rubber expansion bellows design
Why Choose ZHICHENG Products?
- 24 hours online service - anytime, anywhere support
- 100% quality inspection before shipment
- Strong production capability and strict quality control
Material Specifications
| No | Name | Material |
| 1 | Outer/inner rubber | NR, EPDM, NBR, Neoprene etc. |
| 2 | Frame | Nylon cord fabric |
| 3 | Pressurized ring | Steel wire strand |
| 4 | Flange | Carbon steel galvanized, paint ductile iron, stainless steel etc. |
Operation Conditions
| Parameter | Value |
| Working temperature | -15℃~80℃ (-30℃~150℃) |
| Working pressure | 6-40 bars (PN6-PN40) |
| Test pressure | 1.5 times of working pressure |
| Explosion pressure | 2 times of working pressure |
| Applicable media | Air, water, sewage, sea water, acid, alkali, oil etc. |
Main Connection Dimensions
| Nominal diameter | Length (mm) | Axial displacement (mm) | Horizontal movement (mm) | Deflection angle (a1+a2)° | Special length (mm) |
| 32 (1 1/4") | 95 | 9 | 6 | 15° | 130/150/200 |
| 40 (1 1/2") | 95 | 10 | 6 | 15° | 130/150/200 |
| 50 (2") | 105 | 10 | 7 | 15° | 130/150/200 |
| 65 (2 1/2") | 115 | 13 | 7 | 15° | 130/150/200 |
| 80 (3") | 135 | 15 | 8 | 15° | 130/150/200 |
| 100 (4") | 150 | 19 | 10 | 15° | 130/200 |
| 125 (5") | 165 | 19 | 12 | 15° | 130/150/200 |
| 150 (6") | 180 | 20 | 12 | 15° | 130/150/200 |
| 200 (8") | 210 | 25 | 16 | 15° | 130/150/200 |
| 250 (10") | 230 | 25 | 16 | 15° | 130/150/200 |
| 300 (12") | 245 | 25 | 16 | 15° | 130/150/200 |
Note: Size range from DN25-3000 are all available, special size and length can also be customized. Please contact us for exact data.
Product Description
Rubber expansion joints consist of inner and outer rubber, cord layer and steel wire strand, which are vulcanized and then combined with metal flanges or loose sleeves of parallel joints. It is widely used in various pipeline systems.
The rubber expansion joints allow for four way movements, and they are molded from synthetic rubber and nylon cord. This design reduces vibration and noise, and compensates thermal expansion and contraction caused by temperature change.
Production
ZHICHENG has a strict quality control system, standard production processes, and standardized factory testing to ensure every product meets customer requirements and delivers high-quality performance.
Packaging & Shipping
Packaging
- Inner package: plastic film with carton cases
- Outer package: wooden cases (usually 1100mm×1100mm×1100mm)
Shipping
Transportation: by sea or by air.
Product Installation
We provide complete installation instructions, notes, and maintenance guidelines with every order. Below is an installation example of a DN1800 rubber expansion joint.
Frequently Asked Questions
Q: Are you a trading company or a manufacturer?
A: We are manufacturers of rubber expansion joints, metal expansion joints, flexible hoses, dismantling joints, trimmer joints, flange adapters and flanges with over 30 years experience.
Q: Do you have a catalogue?
A: Yes, we do. Please let us know your email or instant messenger and we will send you our catalogue.
Q: Can you provide drawings and technical information?
A: Yes, our specialist technical department will design and supply drawings and technical data.
Q: Do you provide samples? Are they free of charge or do you charge for them?
A: Yes, we can provide samples free of charge, but transport costs are borne by the customer.
Q: Can the products be manufactured to the customer's requirements?
A: Yes, the above specifications are standard specifications and we can design and manufacture as required.
Contact us for more details about price, packaging, shipping, and available discounts!
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