Double Sphere Rubber Expansion Joint

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Double Sphere Rubber Expansion Joint

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Double Sphere Rubber Expansion Joint provides greater flexibility and movement absorption than single sphere type. It is suitable for vibration reduction, noise control and movement compensation in water treatment, HVAC, pump stations and industrial pipeline systems.

Factory-direct prices are available for double sphere rubber expansion joints. The final price depends on the following specifications:

Nominal diameter and face-to-face length

Rubber material: EPDM, NBR or FKM

Flange material and flange standard

Pressure rating

Required quantity

Special coating or tie rod requirements

Products are normally protected with plastic film and packed in export-grade plywood cases. Bulk order discounts and customized packaging are available.

For an accurate quotation, please send your required size, quantity and technical specifications.

Website: https://hongzepipe.com/

WhatsApp: https://wa.me/8615838027988

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ZHENGZHOU HONGZE VALVE PIPELINE EQUIPMENT CO., LTD.

Henan, China

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Double Sphere Rubber Expansion Joint

Hongze Double Sphere Rubber Expansion Joint is a flexible flanged pipeline connector designed to absorb vibration, reduce noise, compensate for pipe movement and reduce mechanical stress on pumps, valves, compressors and other pipeline equipment.

Compared with a single sphere rubber expansion joint, the double sphere structure provides increased flexibility and greater axial, lateral and angular movement capacity. It is suitable for pipeline systems where additional movement absorption, vibration isolation or installation flexibility is required.

Zhengzhou Hongze Valve & Pipeline Equipment Co., Ltd. manufactures double sphere rubber expansion joints in sizes from DN40 to DN600. Rubber materials, flange standards, flange materials, face-to-face length and other technical specifications can be customized according to the working medium, temperature, pressure and installation requirements.

Product Features

Double sphere structure provides greater flexibility than a single sphere design.
Absorbs axial extension and compression, lateral displacement and angular deflection.
Reduces vibration and structure-borne noise generated by pumps and mechanical equipment.
Helps reduce pipeline stress caused by temperature changes, pressure fluctuations and installation deviation.
Protects pumps, valves, compressors, chillers and connected pipeline equipment.
Compact flanged design simplifies installation and maintenance.
Available in different rubber materials for water, air, oil, seawater and chemical media.
Flange drilling and face-to-face dimensions can be manufactured to project requirements.
Limit rods, inner sleeves and other optional accessories are available.

Double Sphere Rubber Expansion Joint Specifications

Item	Available Specification
Product name	Double Sphere Rubber Expansion Joint
Alternative names	Double Sphere Rubber Joint, Twin Sphere Rubber Expansion Joint, KST Flexible Rubber Joint
Nominal diameter	DN40–DN600 (1.5–24 inches)
Connection	Flanged connection
Rubber materials	EPDM, NBR, Natural Rubber, Neoprene/CR, IIR and FKM/Viton
Flange standards	ASME/ANSI, DIN, EN, JIS, BS, GB, HG and customized drilling
Flange materials	Carbon steel, galvanized steel, stainless steel 304 or stainless steel 316
Working pressure	Selected according to nominal diameter, construction and project requirements
Working temperature	Depends on rubber material and working medium
Optional accessories	Limit rods, control units, inner sleeve and customized flanges

Main Connection Dimensions

The following dimensions are standard reference values. Face-to-face length, flange drilling and movement capacity may be adjusted according to the selected pressure rating, flange standard and project requirements. The approved production drawing should be used as the final reference.

Nominal Diameter	Inch	Length L (mm)	Axial Extension (mm)	Axial Compression (mm)	Lateral Displacement (mm)	Deflection Angle
DN40	1.5	165	30	50	45	40°
DN50	2	165	30	50	45	40°
DN65	2.5	175	30	50	45	40°
DN80	3	175	30	50	45	40°
DN100	4	225	35	50	40	35°
DN125	5	225	35	50	40	35°
DN150	6	225	35	50	40	35°
DN200	8	325	35	60	35	30°
DN250	10	325	35	60	35	30°
DN300	12	325	35	60	35	30°
DN350	14	325	35	60	35	30°
DN400	16	340–400	35	60	35	30°
DN450	18	340–400	35	60	35	30°
DN500	20	340–400	35	60	35	30°
DN600	24	340–400	35	60	35	30°

Note: The above dimensions are reference values. Customized dimensions can be manufactured according to drawings or technical specifications.

Rubber Material Selection

EPDM Rubber

EPDM double sphere rubber expansion joints are commonly selected for water, hot water, air, seawater, wastewater and weak acid or alkali applications. EPDM provides good resistance to weathering, ozone and ageing. It is not normally recommended for petroleum oils.

NBR Rubber

NBR rubber expansion joints are suitable for mineral oil, fuel, lubricating oil and other oily media. The actual material grade should be selected according to the oil type, concentration and operating temperature.

Natural Rubber

Natural rubber provides good elasticity and vibration absorption for general water, air and non-aggressive media applications.

Neoprene / CR

Neoprene offers balanced resistance to weather, seawater, ozone and moderate oil exposure. It is commonly considered for marine and outdoor pipeline systems.

FKM / Viton

FKM/Viton is available for applications requiring improved resistance to higher temperatures, oils or certain chemicals. The working medium must be confirmed before material selection.

Important: Rubber compatibility depends on the medium, concentration, temperature and operating conditions. Please provide complete working data before ordering.

Flange Standards and Materials

Hongze double sphere rubber expansion joints can be supplied with flange drilling according to commonly used international and project standards, including:

ASME/ANSI flange standards
DIN PN flange standards
EN flange standards
JIS 10K and JIS 16K
BS flange standards
GB and HG flange standards
Customized drilling according to drawings

Available flange materials include carbon steel, galvanized carbon steel, stainless steel 304 and stainless steel 316. Flange coating, drilling, thickness and pressure rating should be confirmed before production.

Typical Applications

Water supply and drainage pipelines
Pump inlet and outlet connections
HVAC and chilled-water systems
Cooling towers and cooling-water pipelines
Wastewater and water-treatment plants
Power-plant pipeline systems
Chemical and petrochemical pipelines
Marine and seawater systems
Compressors and industrial mechanical equipment
General industrial pipeline connections

Double Sphere vs. Single Sphere Rubber Expansion Joint

Comparison	Double Sphere	Single Sphere
Flexibility	Higher flexibility	Standard flexibility
Movement capacity	Larger movement absorption	Suitable for standard movement requirements
Face-to-face length	Generally longer	Generally more compact
Typical selection	Applications requiring additional flexibility	General vibration and movement control

The final selection should be based on working pressure, required movement, available installation space, pipe support design and applicable engineering standards.

Customized Production

Hongze can manufacture double sphere rubber expansion joints according to customer drawings, technical data sheets or actual pipeline requirements. Available customization includes:

Special nominal diameter and face-to-face length
Customized flange drilling and flange material
EPDM, NBR, CR, IIR, natural rubber or FKM rubber body
Limit rods or control units
Internal flow sleeve for selected applications
Special pressure or movement requirements
Large-diameter production
Project marking, packaging and documentation

Installation Guidelines

Confirm that the nominal diameter, flange standard, pressure rating and rubber material match the pipeline requirements.
Do not twist the rubber joint during installation.
Align the mating flanges before tightening the bolts. Do not use the rubber joint to correct serious pipe misalignment.
Tighten flange bolts gradually and evenly in a diagonal sequence.
Do not allow welding sparks or sharp tools to damage the rubber body.
Provide suitable pipe guides, anchors and supports according to the pipeline design.
For suspended water pipelines above DN200, fixed supports or suitable control units should be considered.
Install limit rods where excessive displacement, pressure thrust or pull-out risk may occur.
Do not exceed the approved pressure, temperature or movement range.
Inspect the rubber body and flange connection periodically during service.

Information Required for Quotation

To receive an accurate quotation and technical recommendation, please provide:

Nominal diameter or pipe outside diameter
Working pressure and test pressure
Working medium and concentration
Minimum and maximum working temperature
Required axial, lateral or angular movement
Flange standard, pressure class and flange material
Required face-to-face length
Installation orientation and pipeline support conditions
Quantity and delivery destination
Drawings or technical specifications, if available

Why Choose Hongze Pipe?

Hongze Pipe supplies standard and customized rubber expansion joints for industrial pipeline projects. Our team can assist with material selection, flange matching, movement requirements, face-to-face dimensions and optional control units according to actual operating conditions.

Before production, technical requirements can be checked against the customer’s drawings or data sheet. This helps reduce flange mismatches, incorrect rubber selection and installation problems at the project site.

Frequently Asked Questions

What is a double sphere rubber expansion joint used for?

It is used to absorb vibration, reduce pipeline noise and compensate for axial, lateral and angular movement. It can also help isolate pumps and mechanical equipment from connected piping.

What is the difference between single sphere and double sphere rubber joints?

A double sphere rubber joint normally provides greater flexibility and movement capacity, while a single sphere joint has a shorter and more compact structure. Selection depends on movement requirements, pressure, installation space and pipeline support design.

Which rubber material should I select?

EPDM is commonly used for water and air, while NBR is commonly selected for oil-containing media. Neoprene, natural rubber and FKM/Viton are available for other operating conditions. Material compatibility must be confirmed using the medium, concentration and temperature.

Can you manufacture customized flange drilling?

Yes. Flanges can be manufactured according to ASME/ANSI, DIN, EN, JIS, BS, GB, HG or customer drawings. Please provide the flange standard, pressure class and drilling dimensions before ordering.

Are limit rods required?

Limit rods or control units should be considered where excessive movement, pressure thrust, pipe pull-out or insufficient anchoring may occur. The final requirement should be confirmed by the pipeline engineer.

Product and Factory Information

Hongze double sphere rubber expansion joint technical information

For product drawings, technical datasheets, prices and customized solutions, please contact us.

Website: https://hongzepipe.com/

WhatsApp: https://wa.me/8615838027988

Email: export@hongzepipe.com

Send us your technical specifications and required quantity. Our team will provide a fast quotation and professional technical support.

                                                            Product Type
                                                            Double Sphere Rubber Expansion Joint
                                                        
                                                            Nominal Size
                                                            DN40–DN600 / Customized
                                                        
                                                            Rubber Material
                                                            EPDM / NBR / FKM
                                                        
                                                            Flange Material
                                                            Carbon Steel / Galvanized Steel / SS304 / SS316
                                                        
                                                            Flange Standard
                                                            ASME / EN / DIN / JIS / BS / GB
                                                        
                                                            Pressure Rating
                                                            PN10 / PN16 / Class 150 / Customized
                                                        
                                                            Connection Type
                                                            Flanged
                                                        
                                                            Movement Type
                                                            Axial / Lateral / Angular
                                                        
                                                            Face-to-Face Length
                                                            Standard or Customized
                                                        
                                                            Working Medium
                                                            Water / Air / Oil / Mild Chemicals
                                                        
                                                            Optional Accessories
                                                            Tie Rods / Control Units
                                                        
                                                            Inspection
                                                            Dimensional / Visual / Pressure Testing
                                                        
                                                            Warranty
                                                            12 Months
                                                        
                                                            Country of Origin
                                                            China

Water supply and drainage systems

HVAC and chilled water systems

Pump stations

Wastewater treatment plants

Fire protection systems

Chemical and industrial pipelines

Marine piping systems

Power plants

They are designed to absorb vibration and noise, compensate for axial, lateral and angular movement, reduce pipeline stress and protect pumps, valves and other connected equipment. Different rubber materials are available to suit water, air, oil, chemicals and other working media.

Double sphere design provides greater movement absorption than a single sphere rubber expansion joint

Absorbs axial compression, axial extension, lateral movement and angular deflection

Effectively isolates vibration and reduces pipeline noise

Reduces stress on pipelines, pumps, valves and connected equipment

Reinforced rubber construction provides excellent flexibility and pressure resistance

Available in EPDM, NBR, FKM and other rubber materials

Carbon steel, galvanized steel and stainless steel flanges are available

Flange standards and face-to-face lengths can be customized

Compact structure for convenient installation and maintenance

Suitable for water, air, oil, mild chemicals and different industrial media according to the selected rubber material