Hongze Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Union Rubber Expansion Joint
Key Features
Technical Specifications
| Nominal Diameter (DN) | Inch | Length (L) mm | Axial Extension mm | Lateral Displacement mm | Angular Deflection (°) |
|---|
| DN20 | ¾” | 110 | 5 | 6 | 15 |
| DN25 | 1″ | 115 | 5 | 6 | 15 |
| DN32 | 1¼” | 120 | 6 | 6 | 15 |
| DN40 | 1½” | 125 | 6 | 6 | 15 |
| DN50 | 2″ | 130 | 7 | 7 | 15 |
| DN65 | 2½” | 140 | 7 | 7 | 15 |
| DN80 | 3″ | 160 | 8 | 8 | 15 |
| Project | Unit | TRJ-1 | TRJ-2 | TRJ-3 |
|---|
| Model | – | TRJ-1 | TRJ-2 | TRJ-3 |
| Working Pressure | MPa (kgf/cm²) | 1.0 (10) | 1.6 (16) | 2.5 (25) |
| Burst Pressure | MPa (kgf/cm²) | 2.0 (20) | 3.0 (30) | 4.5 (45) |
| Vacuum Resistance | KPa (mmHg) | 53.3 (400) | 86.7 (650) | 100 (750) |
| Operating Temperature | °C | -15 ~ 115°C (Special: -30 ~ 250°C) | -15 ~ 115°C (Special: -30 ~ 250°C) | -15 ~ 115°C (Special: -30 ~ 250°C) |
| Applicable Media | – | Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc. | Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc. | Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc. |
| Material | Temperature Range (°C) | Oil Resistance | Acid & Alkali Resistance | Elasticity | Abrasion Resistance | Typical Applications |
|---|
| EPDM | -40 ~ 120 | Poor | Excellent | Excellent | Medium | Water, Steam, Air |
| NR (Natural Rubber) | -30 ~ 80 | Poor | Medium | Excellent | Excellent | Industrial Water, Air |
| NBR | -20 ~ 100 | Excellent | Medium | Good | Good | Oil, Lubrication Systems |
| Neoprene | -35 ~ 100 | Good | Good | Medium | Good | Seawater, Mild Chemicals |
| Silicone | -60 ~ 200 | Poor | Poor | Good | Low | Food Grade, Medical |
| FKM (Viton) | -20 ~ 250 | Excellent | Excellent | Medium | Excellent | Chemical, High Temp Oil |
| Butyl (IIR) | -40 ~ 120 | Poor | Good | Excellent | Medium | Gas, Acidic Gases |
Preparation:
Ensure the threaded ends of the joint and connecting pipes are clean and free of damage. Apply appropriate sealing tape or sealant.Connection:
Hand-tighten the rubber joint onto the pipeline, ensuring threads engage properly without cross-threading.Tightening:
Gradually tighten with a wrench to achieve a secure and leak-free connection, but avoid over-tightening to prevent damage to the joint.Inspection:
Check alignment and tightness after installation. Perform a pressure test to confirm no leakage is present.
Regular Checks:
Inspect regularly for any sign of leakage, deformation, cracks, or corrosion on threads and rubber body.Thread Condition:
Periodically check thread conditions. Reapply sealant or sealing tape if leakage occurs.Replacement:
Replace immediately upon visible damage, excessive wear, or if the joint has exceeded its service life.Protection:
Avoid direct exposure to harmful chemicals, oils, and extreme temperatures to extend the life of the rubber joint.Cleaning:
Regularly clean threads and rubber surfaces gently using mild detergent and water to prevent corrosion and deterioration.
What is a Union Rubber Expansion Joint and how does it work?
A Union Rubber Expansion Joint is a flexible connector with threaded or union ends, designed to absorb vibration, reduce noise, and compensate for minor misalignments in small-diameter pipelines. It connects quickly and securely using standard male or female threads, ensuring a leak-proof and reliable seal.
What are the typical applications for Union Rubber Expansion Joints?
These joints are ideal for HVAC systems, water circulation pipelines, pump outlets, and compact piping systems where easy installation, vibration isolation, and flexibility are required.
What materials and sizes are available for your Union Rubber Expansion Joints?
We offer Union Rubber Expansion Joints in sizes from DN15 to DN100, made from high-quality EPDM, NBR, or custom rubber compounds. The threaded ends can be supplied as BSP, NPT, or other international standards to suit your piping requirements.
Can you supply customized Union Rubber Expansion Joints based on our drawings?
Yes, we provide OEM and ODM services. Send us your drawings or specifications, and our engineering team will quickly deliver a tailored solution to match your needs.
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Let Us Help With Your Pipeline Needs
We respond quickly to inquiries and provide expert support on rubber joints, metal hoses, and customized solutions.
