Service & Support
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Rubber Expansion Joint Installation Manual
Material: EPDM (Ethylene Propylene Diene Monomer)
•Temperature Range: -40 ~ 120°C
•Oil Resistance: Poor
•Acid & Alkali Resistance: Excellent
•Elasticity: Excellent
•Abrasion Resistance: Medium
•Typical Applications: Water supply, steam, air systems
Material: NR (Natural Rubber)
•Temperature Range: -30 ~ 80°C
•Oil Resistance: Poor
•Acid & Alkali Resistance: Moderate
•Elasticity: Excellent
•Abrasion Resistance: Excellent
•Typical Applications: Industrial water, air
Material: NBR (Nitrile Butadiene Rubber)
•Temperature Range: -20 ~ 100°C
•Oil Resistance: Excellent
•Acid & Alkali Resistance: Average
•Elasticity: Moderate
•Abrasion Resistance: Excellent
•Typical Applications: Oil pipelines, air systems, lubrication systems
Material: Neoprene (CR Rubber)
•Temperature Range: -35 ~ 100°C
•Oil Resistance: Moderate
•Acid & Alkali Resistance: Good
•Elasticity: Good
•Abrasion Resistance: Good
•Typical Applications: Marine systems, chilled water systems
Material: FKM (Viton)
•Temperature Range: -20 ~ 200°C
•Oil Resistance: Excellent
•Acid & Alkali Resistance: Excellent
•Elasticity: Moderate
•Abrasion Resistance: Excellent
•Typical Applications: Chemical systems, dyes, and corrosive media
Rubber expansion joints are designed to absorb and compensate for various movements in piping systems. Their core functions include:
1.Axial Compression and Elongation
Allows for extension or compression during installation or due to temperature changes, thus relieving stress on the system.
2.Lateral Offset Compensation
Absorbs movements caused by ground settlement or misalignment in the horizontal or vertical direction.
3.Angular Deflection
Compensates for angular shifts caused by misaligned or uneven piping connections, helping maintain sealing performance and reduce stress on fixed supports.
4.Vibration and Noise Reduction
The elasticity of rubber effectively isolates and dampens mechanical vibration and operational noise, extending equipment life.
5.Pressure Pulsation and Water Hammer Resistance
Reduces the impact of sudden pressure surges (water hammer) and cuts down instantaneous shock pressure in the system.
These features help ensure the safety and stability of piping systems, improve sealing reliability, and extend service life.
1. Standard Working Pressure:
•PN10 (10 bar / 145 psi)
•PN16 (16 bar / 232 psi)
Other pressure ratings can be customized upon request.
2. Burst Pressure:
•Normally 3 times the rated working pressure
•Actual value may vary based on size and rubber thickness
3. Temperature Ranges by Material:
•EPDM: -40°C to +120°C
•NBR (Nitrile Rubber): -20°C to +100°C
•Neoprene: -35°C to +100°C
•FKM (Viton): -20°C to +200°C
•NR (Natural Rubber): -30°C to +80°C
4. Important Notice:
•Simultaneous exposure to maximum pressure and temperature may reduce service life.
•For special conditions, please consult our technical team.
1. Regular Visual Inspection:
•Check for cracks, surface aging, rubber layer separation, or peeling.
•Identify any signs of leakage or rubber deformation.
•Measure wall thickness if necessary to assess wear.
2. Bolt Retightening:
•Retighten bolts 12–24 hours after initial installation and operation.
•Periodically inspect bolt torque during maintenance intervals.
3. Replacement Cycle:
•Standard replacement recommendation: every 3 to 5 years, depending on operating conditions.
•For frequent vibration, high pressure, or critical applications, inspect and replace more frequently.
4. Storage and Handling:
•Store in a cool, dry, and well-ventilated place away from direct sunlight.
•Avoid environments with heat, moisture, ozone, solvents, oils, or corrosive gases.
•Do not stack heavy objects directly on the product.
5. Special Notes During Long-Term Shutdown:
•If the joint is idle for an extended period, relieve system pressure and avoid prolonged compression.
•Before restarting, inspect visually and retighten bolts as needed.
Frequently Asked Questions
What is the lifespan of a rubber expansion joint?
Typically 5–10 years depending on the application environment, material type, and installation quality. Proper maintenance can extend its service life.
Can I customize the size or flange type?
Yes, we offer customization for flange standards (DIN, ANSI, JIS, etc.), pressure ratings, and joint lengths.
Are your products certified?
Our rubber joints are manufactured under ISO 9001 standards and can provide CE, WRAS, and third-party inspection certificates upon request.
How should I store rubber expansion joints before installation?
Store in a cool, dry, and shaded environment. Avoid direct sunlight, ozone, or contact with petroleum-based liquids.
Do you provide installation support?
Yes, we provide detailed manuals and remote guidance via WhatsApp or Email for international customers.
Logistics & Shipping Information
1. Global Delivery Options
We offer international shipping via sea freight, air cargo, and express delivery (DHL, FedEx, UPS). You can choose the most suitable method based on your time and budget.
2. Shipping Time Estimates
•Asia: 5–10 days (express), 15–25 days (sea freight)
•Europe & North America: 7–12 days (express), 25–40 days (sea freight)
•Middle East & Africa: 8–15 days (express), 30–45 days (sea freight)
3. Packaging & Labeling
All products are packed in wooden crates or export cartons with waterproof protection. Custom logos and neutral labeling are available.
4. Ports of Shipment
Primary ports: Qingdao / Shanghai / Tianjin, China. We can also ship from other ports upon request.
5. Real-Time Tracking
Tracking numbers and shipping documents (Bill of Lading, Commercial Invoice, Packing List) will be sent within 24 hours after dispatch.
6. Customs & Clearance Support
We assist in preparing all export documents and can provide Form E, Certificate of Origin, and other paperwork needed for customs clearance.
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