Product Overview

The Fully Sealed Rubber Expansion Joint is a specially designed flexible connector for pipelines that require high sealing performance under demanding working conditions.
Unlike standard rubber joints, this design features a full-face sealing structure that minimizes leakage risks and ensures long-term stability. It is widely used in water supply systems, sewage treatment plants, HVAC pipelines, chemical industries, and oil & gas applications.
With superior elasticity, vibration absorption, and excellent sealing capability, this joint effectively compensates for axial movement, lateral displacement, and angular deflection, extending the service life of pipeline systems.


Compared to conventional single-ball rubber joints, the fully sealed end-face type offers the following significant advantages:

Excellent Sealing Performance:
Dual Sealing Mechanism: The first seal is a gasket seal between the pipe flanges, and the second seal is between the joint's internal sealing ring and the pipe flange. This effectively prevents leakage of media (especially gases and toxic and hazardous liquids) even under high pressure.
This eliminates the potential sealing issues associated with conventional rubber joints due to the curved end of the ball.

Higher Pressure Capacity:
Due to its reinforced structure and optimized sealing design, it can typically withstand higher pressures (e.g., up to 2.5 MPa, 4.0 MPa, or even higher) than conventional rubber joints of the same specification.

Excellent Displacement Compensation:
While retaining the essential functions of a rubber joint, it effectively absorbs axial expansion, lateral displacement, and angular deflection in the piping system, relieving stress.

Excellent Vibration and Noise Reduction:
The rubber material itself effectively isolates and absorbs vibration and structure-borne noise generated by equipment such as pumps and valves.

Easy Installation:
The built-in sealing gasket eliminates the need for additional gaskets on the pipe flange, simplifying installation and preventing leaks caused by forgotten or incorrect gasket installation.


Key Features & Advantages

1.100% Leak-Proof Design – The full-face seal structure provides complete sealing, reducing leakage risk even under high pressure.
2.Excellent Flexibility – Absorbs pipeline vibration, reduces noise transmission, and compensates for misalignment.
3.Corrosion & Wear Resistance – Available in EPDM, NBR, Neoprene, and Natural Rubber to match different media conditions.
4.Pressure & Temperature Resistant – Suitable for working pressure ranges up to PN16 and temperature resistance from -20°C to +120°C depending on material selection.
5.Durable Construction – Reinforced with nylon cord and high-strength steel flanges, ensuring long service life.


Technical Specifications (Reference)

Typical Applications

• Drinking water and wastewater pipelines
• HVAC and chilled water systems
• Oil, fuel, and chemical pipelines
• Pump stations and industrial equipment connections
• Marine and offshore installations

Installation Guidelines
Ensure flanges are aligned and free from burrs or sharp edges.
Do not install under extreme torsion or tension.
Tighten bolts diagonally in sequence to maintain uniform pressure.
Avoid direct exposure to strong sunlight, ozone, or sharp objects.
For high-pressure or large-diameter applications, install limit rods or restraining devices to prevent overextension.


FAQ
Q1: What makes a fully sealed rubber expansion joint different from a standard joint?
A: It features a full-face seal design that provides stronger sealing performance, making it ideal for high-pressure or zero-leakage systems.

Q2: Can it be used for chemical pipelines?
A: Yes. By selecting the appropriate rubber material (e.g., EPDM for acids, NBR for oil-based media), it can safely handle different chemical environments.

Q3: How long is the service life?
A: Typically 5–10 years, depending on operating conditions such as pressure, temperature, and media type.