DN25 DN40 DN100 Stainless Steel Flange Metal Pipe Expansion Joint

Designed for superior pipeline flexibility and vibration isolation, our Stainless Steel Flange Metal Bellows Expansion Joint is a highly reliable pipe fitting solution. It is engineered to absorb thermal expansion, reduce system noise, and compensate for pipeline misalignment, making it an essential component for modern fluid transmission systems.

General Description & Structure

This advanced expansion joint features a durable composite structure. It consists of a premium rubber pipe body—meticulously crafted with an inner glue layer, multi-layer proofing cord fabric for structural reinforcement, and a resilient outer glue layer—securely integrated with a metal woggle joint and steel flanges.

It is particularly applicable for the connection of inlet and outlet pipes in various fan coil units of air conditioning (HVAC) systems. Whether installed in the guest rooms of luxury hotels, large-scale restaurants, or commercial office buildings, this expansion joint effectively minimizes vibration transmission and ensures quiet, efficient, and leak-free operation.

Core Product Advantages

To help procurement teams and engineers lower selection risks and guarantee long-term value, our expansion joints are manufactured with strict quality controls and industrial-grade materials:

• 53% Natural Rubber Content: The high proportion of natural rubber ensures exceptional elasticity and fatigue resistance. Under standard operating conditions, it can continue to be used for up to 15 years without premature aging or cracking.

• Enhanced Wall Thickness & Durability: The optimized thickness of the rubber body significantly improves overall reliability and burst resistance, making your pipeline usage much safer and more durable over time.

• Premium 64k Steel Flanges: Selected 64k steel flanges provide high tensile strength and secure mechanical connections, preventing leaks even under fluctuating system pressures.

• 15-Minute Zinc Plating Process: The metal components undergo a rigorous 15-minute zinc plating treatment. This delivers outstanding high pressure resistance, high temperature resistance, oil resistance, wear resistance, and superior anti-corrosion properties against acids and alkalis.

Dimensional Specifications

The following table details the boundary dimensions for sizes ranging from DN25 to DN1000. Please refer to these precise measurements to ensure proper fitment and alignment for your specific project requirements.

Installation & Operating Guidelines

To maximize the service life and maintain the safety of your piping systems, please adhere strictly to the following installation and operational instructions:

1. All expansion joints are finished with retaining flanges. Limit rod units are available on special request to prevent over-extension during extreme pressure surges.

2. Pressures shown are recommended "operating" pressures. The test pressure is 1.5 times the "operating" pressure, and the burst pressure is 3 times the "operating" pressure, providing a substantial safety margin.

3. Vacuum rating is based on the neutral installed length without external load. Products shall not be installed "elongated" on vacuum applications, as this may compromise structural stability.

4. Crucial Warning: Do not weld near the expansion joints or weld the steel flanges to the piping after the expansion joints are installed. This will either burn or seriously damage the rubber components of the expansion joints, leading to immediate failure.

Extensive Applications

Beyond commercial HVAC systems, these flexible metal pipe expansion joints are widely utilized across various demanding industrial environments. They are highly suitable for transmission and distribution systems, communications systems, and transportation systems engineering.

Furthermore, they play a critical role in a variety of mechanical and automation control equipment found in railways, power plants, and the chemical industry. Thanks to their outstanding flexibility, superior corrosion resistance, high temperature tolerance, abrasion resistance, and advanced tensile properties, these joints effectively reduce mechanical vibration and accommodate thermal movements, ensuring the safe and efficient operation of complex infrastructure.