DI Socket Fittings with Self-anchoring Joint

Our self-anchoring joint fittings provide maximum security. They prevent joint separation completely. These fittings suit high pressure applications. They resist pipe movement effectively. Choose our safest connection solution.

Integrated self-anchoring design: The joint incorporates locking segments that automatically engage under axial load, preventing joint separation without external restraints.

Elimination of thrust blocks: Reduces concrete material and labor costs, significantly shortening installation time for buried pipelines.

Multiple configurations: Available in bends, tees, reducers, and custom fabricated shapes to suit complex piping layouts.

Pressure-rated integrity: Maintains full pressure rating of the pipe system while providing restrained joint capability.

Corrosion protection: Standard fusion-bonded epoxy coating (minimum 250 microns) or zinc coating with epoxy top layer per EN 545.

Joint flexibility: Allows angular deflection up to 3° to 5° depending on size, accommodating ground settlement and directional changes.

Simplified installation: Push-on assembly requires no bolting or welding, reducing on-site labor and equipment needs.

Typical Applications:

Water transmission and distribution mains requiring restrained joints

Bridge crossings and river crossings

Tunnels, culverts, and above-ground installations

Seismic zones and areas with unstable soil conditions

Trenchless installations (directional drilling, pipe jacking)

Media Compatibility:
Suitable for potable water, raw water, treated sewage, and other non-aggressive fluids at operating temperatures up to 50°C.

Materials:

Body: Ductile iron grade EN-GJS-400-15 / EN-GJS-450-10 (ISO 1083 / ASTM A536)

Gasket: EPDM (potable water grade) or NBR

Locking elements: Stainless steel (SS304 / SS316) or ductile iron with anti-corrosion treatment

Bolts / screws (if applicable): Stainless steel A2 / A4

Standards:

Product standard: EN 545 (water applications) / EN 598 (sewage applications) / ISO 2531

Gasket material: EN 681-1 / ISO 4633

External coating: EN 14901 / ISO 8179

Internal lining: Cement mortar per EN 545 / ISO 4179, or epoxy lining per EN 14901

Note:

Materials, coatings, and standards can be adapted to meet project-specific requirements, including UL/FM certification or special corrosion protection for aggressive environments.

We test material composition first. We check mechanical properties. We inspect locking segments. We verify dimensions carefully. We pressure test all fittings. We conduct final inspection. Our system ensures reliability.

Prepare trench properly. Check fitting condition. Clean socket and spigot. Apply lubricant to seal. Push components together. Hear click sound. Verify lock engagement. Test connection security.

Prevents joint separation
Handles high pressure
Resists ground movement
Easy installation process
Saves installation time
Reduces maintenance needs
Ensures system safety

We use heavy wooden crates. Steel straps secure fittings. Protective caps cover ends. Cushioning prevents damage. Clear labels show handling. Weather protection included.

We provide technical support. We offer installation guidance. We supply spare parts. We respond within 24 hours. We solve problems quickly. We ensure customer satisfaction.

Joint performance testing: Axial load resistance verification per EN 545 / EN 598, ensuring restrained joint capability meets design requirements.

Hydrostatic pressure testing: Each fitting subjected to 1.5 times nominal pressure to verify structural integrity.

Gasket material testing: Hardness, tensile strength, and aging resistance per EN 681-1.

Coating inspection: Holiday testing and thickness measurement for external epoxy coatings.

Third-party inspection: Available upon request, including SGS, BV, or customer-nominated inspectors.

Factory witness testing: Clients may witness pressure tests and coating inspections prior to shipment.