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Double Sphere Rubber Expansion Joint

8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange

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8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange

Brand Name:	Lianghe
Model Number:	KST
MOQ:	1 set
Price:	$5.9-$55.8
Packaging Details:	Wooden case
Payment Terms:	T/T,D/P,D/A,Western Union,MoneyGram,L/C

Detail Information

Product Description

Detail Information

Place of Origin:

China

Certification:

ISO 9001

Flange Joint Material:

CS, SS304, SS316 Etc

Joint Type:

Flange Type

Technology:

Forged, Casting, Vulcanization

Length:

165~400mm

Size:

1/2 Inch - 24 Inch

Vacuum Resistance:

0.05MPa

Angular Deflection:

≥ 15°

Flange Standards:

ANSI B16.5

Stock:

A Large Of Stock

Supply Ability:

6500 sets per month

Highlight:

8 inch rubber expansion joint

double sphere expansion joint with flange

ductile iron flange rubber joint

Product Description

Product Overview

The 8 Inch Double Sphere Rubber Expansion Joint with ductile iron flanges is a high-flexibility pipe connector designed to absorb vibration, reduce noise, and compensate for pipeline displacement. It is widely used in water supply systems, HVAC pipelines, sewage treatment, chemical plants, and shipbuilding industries.
The double sphere structure provides better flexibility, higher pressure resistance, and longer service life compared to single sphere types, making it ideal for demanding industrial applications.

8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange 0

Key Features and Advantages

✅ 1. Enhanced Flexibility and Vibration Absorption

The double sphere rubber design increases movement capacity, allowing axial compression, lateral offset, and angular deflection. It effectively absorbs vibration from pumps and compressors, protecting pipelines and extending service life.

✅ 2. High-Quality EPDM / NBR / Neoprene Material

The inner rubber layer is made of EPDM, NBR, or Neoprene, depending on the medium:

EPDM: Excellent resistance to hot water, steam, and chemicals

NBR: Best for oil, gas, and fuel environments

Neoprene: Good for seawater and outdoor applications
This ensures durability and reliable sealing performance in various working conditions.

✅ 3. Ductile Iron Flanges – Strong and Corrosion-Resistant

The flanges are made of ductile iron (QT450), offering high tensile strength and good corrosion resistance.
They are produced according to ANSI 150, DIN PN10/PN16, JIS 10K or customized standards, ensuring global compatibility and easy installation.

✅ 4. Wide Temperature and Pressure Range

Working Pressure: PN10 / PN16 / 150LB

Temperature Range: -20°C to +120°C (depending on rubber material)

Nominal Diameter: DN25 – DN3000 (customized sizes available)

✅ 5. Noise and Shock Reduction

It significantly reduces vibration and water hammer effects in pipelines, especially near pumps, chillers, and compressors, creating a quieter and more stable system.

8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange 1

Applications

The 8-inch double sphere rubber expansion joint is suitable for:

1. Water treatment plants – absorb vibration and misalignment

2. HVAC systems – reduce thermal expansion stress

3. Chemical and petrochemical plants – resist corrosion and chemical media

4. Marine and shipbuilding – withstand seawater and movement stress

5. Pumping stations – minimize noise and extend pump life

8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange 2

Why Choose Our Rubber Expansion Joints?

Factory direct supply – competitive pricing and fast delivery

Over 20 years manufacturing experience

OEM / ODM service available

Strict quality control – 100% pressure test before shipment

Exported to 60+ countries worldwide

Our products have earned trust from customers in Europe, the Middle East, Southeast Asia, and North America, especially in water treatment and energy industries.

8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange 3

FAQ

Q1: What is the difference between single and double sphere rubber expansion joints?
A1: The double sphere type offers greater flexibility and displacement absorption capacity, suitable for systems with higher vibration or movement.

Q2: Can this joint be used for seawater or chemical media?
A2: Yes. For seawater, choose Neoprene rubber; for chemical resistance, select EPDM material.

Q3: Do you support custom flange standards?
A3: Yes, we can provide ANSI, DIN, JIS, and customized standards to match your pipeline requirements.

Contact Us

Looking for a reliable rubber expansion joint supplier?
We are a professional manufacturer of rubber sphere rubber joints , providing high-quality products at competitive prices.

Website: www.rubberflexiblejoint.com

Contact: +86-18838958009

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products details

Single Sphere Rubber Expansion Joint

Double Sphere Rubber Expansion Joint

Fully Sealed Rubber Expansion Joint

Custom Rubber Expansion Joint

Rubber Duckbill Check Valve

Dismantling Joint

Bellow Expansion Joint

Flexible Metal Braided Hose

Pipe Expansion Compensators

Gibault Joint

Flange Adaptor

Pipe Repair Clamp

Butterfly Valve

Flanged Gate Valve

8 Inch Double Sphere Rubber Expansion Joint with Ductile Iron Flange

8 inch rubber expansion joint

double sphere expansion joint with flange

ductile iron flange rubber joint