DN25 PN16 HVAC Twin Sphere Rubber Compensator – Natural Rubber with SS304 Threaded Union

SKU: KST-DN25-NR-PN16-SS304

Model TypeKST-Double Sphere
Size (DN)DN25 (1 inch)
Pressure RatingPN16 (16 bar)
MaterialNature Rubber
Flange MaterialStainless Steel 304
Temperature Range0°C to +80°C
Working MediumWater
ConntionThreaded Union

Product Description & Specifications

Product Overview 

The DN25 PN16 HVAC Twin Sphere Rubber Compensator is a high-performance vibration isolation solution specifically engineered for modern Building Services and HVAC piping systems. Featuring a specialized Twin Sphere (Double Sphere) geometry, this joint provides significantly greater flexibility and noise reduction compared to standard single-sphere models, making it the definitive choice for quiet-zone installations.
Constructed from premium Natural Rubber (NR) for maximum internal damping and equipped with SS304 stainless steel threaded unions, this compensator ensures a rust-free, leak-proof connection in chilled and hot water loops. Its compact, double-union design allows for effortless installation in confined ceiling spaces, specifically tailored for Fan Coil Units (FCU) and high-end residential pump stations.

Key Features 

  • Enhanced Twin-Sphere Flexibility: The dual-arch structure offers superior axial, lateral, and angular movement compensation, effectively protecting small-bore piping from thermal stress and mechanical strain.
  • Acoustic & Vibration Damping: Specifically tuned to neutralize high-frequency tremors from circulation pumps, preventing “structure-borne” noise from traveling through building frameworks.
  • High-Resilience Natural Rubber (NR): Formulated for maximum elastic recovery and internal damping, ensuring the highest vibration isolation efficiency in HVAC engineering.
  • Corrosion-Resistant SS304 Unions: Premium stainless steel threaded ends ensure long-term durability and zero contamination in high-standard potable and chilled water systems.
  • Labor-Saving Double Union Design: Enables rapid assembly and disassembly without rotating the piping, significantly reducing labor time in tight maintenance areas.
  • PN16 Pressure Integrity: Precision-engineered to maintain a secure seal under 1.6 MPa (232 PSI) working pressure, meeting global commercial HVAC standards.

Applications 

  • Fan Coil Units (FCU) & AHU: Connecting main water headers to terminal units in hotels, hospitals, and luxury apartments to ensure a silent indoor environment.
  • HVAC Booster Pump Stations: Isolating mechanical vibrations from small chilled or hot water circulation pumps in plant rooms.
  • High-End Residential Building Services: Noise control for domestic water booster systems and floor heating manifolds.
  • Modular Heat Exchanger Units: Accommodating thermal expansion and contraction in compact heating and cooling modules.
  • Variable Refrigerant Flow (VRF) Water Systems: Providing flexible joints for water-cooled VRF outdoor units and distribution piping.

Technical Specifications

Parameter Value
Nominal DiameterDN25 (1 inch)
Working PressurePN16 (1.6 MPa)
Test Pressure2.4MPa
Temperature Range0°C to +80°C
Axial Extension6mm
Axial Compression22mm
Lateral Deflection22mm
Angular Deflection40mm

❓ Frequently Asked Questions (Applications)