Single Sphere Joints (SFC)

A Single Sphere Joint, also known as a Single Sphere Rubber Expansion Joint, is a flexible connector with a single spherical bellow designed to absorb vibration, noise, and movement in piping systems.
The SFC type generally indicates a Single Flanged Connector, where the rubber body is equipped with flange connections for easy installation in industrial pipelines.

Construction

1. Body

   • Material: Reinforced synthetic rubber such as EPDM, NBR, Neoprene, or other compounds depending on the conveyed media.

   • Design: One spherical bellow provides flexibility while maintaining compact length.

2. Reinforcement

   • Multi-ply synthetic tire cord fabric, with optional steel wire reinforcement for high-pressure service.

3. End Fittings

   • SFC Type: Flanged connections (fixed or floating), in carbon steel, stainless steel, or ductile iron.

   • Drilled to match standards such as ANSI, JIS, DIN, or BS.

4. Inner Liner

   • Rubber compound selected to resist specific fluids—water, oil, chemicals, seawater, etc.

Typical Specifications

• Size Range: DN25 (1") to DN1000 (40") or larger.

• Working Pressure: Standard PN10–PN16; higher ratings available on request.

• Vacuum Resistance: Up to –650 mmHg with vacuum rings.

• Temperature Range: –20 °C to +100 °C (higher available with special compounds).

• Movement Capability:

  • Axial Compression: ~10–20 mm

  • Axial Elongation: ~5–10 mm

  • Lateral Deflection: ~10–15 mm

  • Angular Deflection: up to 10°

Applications

• HVAC Systems – connects pumps, chillers, and piping to reduce vibration.

• Water Supply & Wastewater – flexible connections in pumping stations and treatment plants.

• Industrial Piping – chemical plants, power plants, refineries.

• Marine Applications – seawater, cooling water, and ballast lines.

• Process Equipment – vibration isolation for compressors and machinery.

Advantages

• Compact length – saves space in tight installations.

• Cost-effective – generally more economical than twin-sphere designs.

• Reduces noise and vibration to protect piping and equipment.

• Easy installation – standard flanged ends for quick fitting.

• Available in various compounds for compatibility with different media.