The Science of the Dual-Arch Design
In a piping system, the expansion joint is the “lung” that breathes with pressure changes and vibrations. While a single sphere is effective, the Double Sphere (Twin Sphere) design doubles down on flexibility. By using two interconnected arches, the joint can handle significantly more axial extension, compression, and lateral deflection without increasing the installation length excessively.
1. Superior Movement Absorption
The primary reason engineers specify B-NAI double sphere joints is their extended movement range.
Axial Compression & Extension: The dual-arch structure allows the rubber to compress further than a single-arch unit, making it ideal for pipelines subject to heavy thermal cycling.
Greater Deflection: It excels in systems where equipment misalignment is a concern, providing smooth flow even when pipes are slightly out of center.
2. Maximum Vibration and Noise Isolation
Because there is more rubber material and air volume within the two spheres, the joint acts as a more efficient dampener. In high-rise luxury apartments or hospital HVAC systems, where silent operation is mandatory, B-NAI’s double sphere joints effectively trap mechanical noise and stop it from resonating through the metal pipeline.
3. Reinforced Construction for High Pressure
Don’t let the flexibility fool you—B-NAI’s double sphere joints are built for pressure. We utilize:
Synthetic Rubber Compounds: Options in EPDM, NBR, or Neoprene depending on the media.
Tire Cord Reinforcement: High-tensile synthetic fibers layered at precise angles to prevent ballooning under PN16 or PN25 pressures.
