Self‑Anchored Joint (also known as restrained joint or anti‑pullout joint) is a high‑performance self‑locking connection system designed for ductile iron pipelines. It integrates sealing, deflection, and self‑anchoring functions to provide stable and reliable connections for water supply, drainage, and utility pipelines under pressure and complex working conditions.

Core Working Principle

The joint adopts a reinforced T‑type sealing structure with a specially designed locking ring, anti‑slip bead, and compression gland. Under internal pressure or external tension, the locking mechanism automatically engages and grips the pipe spigot, creating a self‑anchoring effect that prevents pipe separation without external thrust blocks.

Key Product Advantages

• Self‑anchoring & anti‑pullout: Eliminates thrust blocks at bends, tees, and reducers, cutting construction costs and time.

• Excellent sealing & flexibility: Allows axial expansion and angular deflection, adapting to foundation settlement and seismic movements.

• High pressure resistance: Suitable for water systems up to 16 bar (DN200) and 10 bar (DN250–DN300), with gas applications up to 6 bar.

• Corrosion resistance & durability: Ductile iron body with premium sealing elements ensures long service life in buried environments.

• Fast installation: Simple structure, no complex tools, supports rapid on‑site assembly and reuse of pipe offcuts.

Typical Applications

• Long‑distance high‑pressure water transmission and urban water supply networks

• Road/river crossing pipelines and sloped installations

• Soft soil, seismic, and geologically complex areas

• Municipal drainage, industrial utility pipelines, and renovation projects