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Rubber Expansion Joints

Application: The joint could primarily reduce the quiver and the noise of the piping system; completely solve the different piping problems as displacement of joint, axial flex and etc. 

Features: Improve the flow circulation and avoid the bellow deformation. Absorbs thermal expansion and shock.   

Structure: bellows + flat welding flanges. 

Main material: Compensates converting misalignment 

Bellows: stainless steel 304. 

Flanges: stainless steel 304 or carbon steel. Compensates for exhaust converter misalignment.


 

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Specification


Application:  The joint could primarily reduce the quiver and the noise of the piping system; completely solve the different piping problems as displacement of joint, axial flex and etc. 

Features: Improve the flow circulation and avoid the bellow deformation. Absorbs thermal expansion and shock.   

Structure: bellows + flat welding flanges. 

Main material: Compensates converting misalignment 

Bellows: stainless steel 304. 

Flanges: stainless steel 304 or carbon steel. Compensates for exhaust converter misalignment.


Rubber Expansion Joints


Size
DN32~DN4000mm
Standard
DIN, JIS
Working Temperature
-40~115℃
Working pressure
PN10/PN16/PN25
Rubber Material
EPDM/NBR
Gasket materials
NBR or EPDM
Other part material
Carbon steel, stainless steel
Connection Type
Flange end or threaded end
Applicable medium
Air, water, seawater, oil, etc
Package
Wooden cases or as per customer's requirements.


Rubber Expansion Joints


Working Principle


Displacement Compensation: Due to the good elasticity and flexibility of rubber, rubber expansion joints can effectively absorb axial, lateral, and angular displacements in the pipeline system. When a pipeline experiences displacement due to temperature changes, pressure fluctuations, or foundation settlement, the corrugated compensation element of the rubber expansion joint will deform in response. This deformation compensates for the pipeline's movement and helps to prevent excessive stress, which could potentially damage the pipeline.


Shock and Noise Reduction: Rubber materials themselves have good shock absorption and sound insulation properties. In the pipeline system, rubber expansion joints can effectively reduce vibrations and noises caused by fluid flow, equipment vibration, etc., improving the stability and comfort of the pipeline system.


Product Features


Good Flexibility: It can adapt to various complex pipeline layouts and installation conditions, and can be bent and deformed to a certain extent, facilitating installation and adjustment.


Strong Corrosion Resistance: The material exhibits excellent resistance to a wide range of chemical substances. It is suitable for use in pipeline systems that transport various corrosive media, such as acids, alkalis, and salt solutions. This resistance helps extend the service life of the pipeline system.


Easy Installation: Rubber expansion joints are lightweight, making them easy to handle. The installation process is straightforward and does not require specialized tools or techniques, which can significantly reduce both installation time and costs.


Application Fields


Building Water Supply and Drainage Systems: Used to connect various water supply and drainage pipes in buildings, compensate for pipeline displacement caused by temperature changes and building settlement, reduce vibration and noise, and ensure the normal operation of the water supply and drainage system.


Heating, Ventilation, and Air Conditioning Systems: HVAC systems, such as air conditioners and heating systems, can absorb the stress generated by pipeline thermal expansion and contraction, reduce noise and vibration, and improve the operating efficiency and comfort of the system.


Chemical Industry: In chemical production, they are used in pipeline systems for transporting various chemical media, which can withstand the corrosion of chemical media and pressure changes, and protect the safe and stable operation of the pipeline system.


Selection Points


Pressure Rating: Select a rubber expansion joint with an appropriate pressure rating according to the working pressure of the pipeline system to ensure that it can withstand the pressure inside the pipeline during operation without cracking or leaking.


Temperature Range: Rubber expansion joints of different materials are suitable for different temperature ranges. The corresponding rubber material should be selected according to the temperature of the medium in the pipeline. For example, EPDM rubber is suitable for hot water and steam pipelines with higher temperatures, and NBR rubber is suitable for oil-resistant and lower-temperature occasions.


Medium Characteristics: Consider the chemical properties, acidity and alkalinity, viscosity, and other characteristics of the medium transported in the pipeline, and select rubber expansion joints with corresponding corrosion resistance and wear resistance to ensure their service life and performance.