Double Sphere Rubber Expansion Joint | High Flexibility & Long Service Life

Product Overview

The Double Sphere Rubber Expansion Joint is a high-performance flexible connector designed to absorb vibration, reduce noise, and compensate for thermal expansion in pipelines. Compared with single sphere designs, the double sphere structure provides greater flexibility, larger displacement capacity, and improved pressure resistance, making it ideal for complex piping systems in industrial, municipal, and commercial applications.

This product is manufactured from high-quality rubber materials such as EPDM, NBR, Neoprene, or Natural Rubber, reinforced with multi-layer synthetic fabric and steel wire for excellent durability under different working conditions.

Technical Specifications

Nominal Diameter (DN): DN25 – DN1200

Working Pressure: PN10 / PN16 / PN25

Material Options:

Body: EPDM, NBR, Neoprene, NR

Reinforcement: Nylon cord & steel wire

Flange: Carbon steel, Stainless steel, or Galvanized steel

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

Movement Capability:

Axial compression: up to 60mm

Axial extension: up to 35mm

Lateral displacement: up to 45mm

Twin sphere rubber expansion joint parameters

Key Features & Benefits

Enhanced Flexibility – Double sphere design allows higher axial, lateral, and angular movement compared to single sphere models.

Noise & Vibration Reduction – Effectively isolates pump and pipeline vibrations, extending the service life of equipment.

Corrosion & Pressure Resistance – Available in multiple rubber compounds to handle water, seawater, oil, chemicals, and gases.

Easy Installation – Compact structure, lightweight, and flange-connected for quick replacement or maintenance.

Wide Application Range – Suitable for HVAC, water supply, sewage treatment, chemical plants, power stations, and shipbuilding industries.

Applications

1.Water & Wastewater Systems – Compensates thermal expansion in long pipelines.

2.HVAC & Pump Systems – Reduces vibration and protects pumps, chillers, and compressors.

3.Chemical & Oil Industry – Resists corrosion from acids, alkalis, and oils with special rubber compounds.

4.Marine & Shipbuilding – Withstands seawater corrosion while ensuring stable operation of onboard piping.

5.Power Plants & Steel Mills – Handles high pressure and temperature fluctuations effectively.

Why Choose Our Double Sphere Rubber Expansion Joint?

✔ Strict quality control with pressure and performance tests before delivery.
✔ OEM & ODM customization available for flange drilling standards (ANSI, DIN, JIS, BS).
✔ Competitive factory-direct price with reliable global shipping.
✔ Proven service life, reducing maintenance cost for end users.

Installation Tips

Ensure proper alignment of pipes before installation.

Do not exceed the designed displacement range to avoid damage.

Avoid direct contact with sharp metal objects or oil that may affect rubber performance.

For outdoor use, consider protective covers against UV exposure.

FAQ

Q1: What is the difference between single sphere and double sphere rubber expansion joints?
A1: The double sphere design provides greater flexibility and higher displacement absorption, especially suitable for systems with larger vibration and expansion.

Q2: Can the expansion joint handle chemicals or seawater?
A2: Yes, by selecting the right rubber material (EPDM for chemicals, NBR for oil, NR for water), the joint can adapt to various media.

Q3: What flange standards are available?
A3: We supply flanges according to ANSI, DIN, JIS, BS, and GB standards, customized as required.

The company adheres to the business philosophy of "customer satisfaction is our first duty, all employees are responsible for creating quality, continuous improvement sets new heights, honest service builds reputation", and wholeheartedly provides high-quality products and professional services to new and old customers.

The factory mainly produces rubber expansion joints, duckbill check valves, dismantling joint, bellow expansion joints, compensators, repair clamp, 02S404 national standard waterproof casings, gate valves ,butterfly valves etc; and all products have passed ISO 9001:2015 quality management system certification; adopting national and industry standards, advanced manufacturing technology, strong R&D and manufacturing capabilities, they are widely used in water supply, drainage, electricity, chemical industry, gas, metallurgy, urban construction and environmental protection and other pipeline industries.