1. Material and Manufacturing
Core Material Composition:
High-grade ductile iron (EN-GJS-500-7/600-3) with spheroidal graphite structure
Malleable iron or carbon steel gland and bolts (ASTM A197/A307)
EPDM or SBR gaskets with pressure-activated sealing
Phosphate or electro-galvanized coating for corrosion resistance
Manufacturing Excellence:
Precision sand casting with controlled cooling
Machined sealing surfaces (Ra ≤ 3.2 μm)
Automated gland assembly with torque verification
Individual hydrostatic testing at 2.5× rated pressure
2. Performance Characteristics
Mechanical Performance:
Pressure rating: 150–350 psi (size-dependent)
Temperature range: -30°C to 100°C (EPDM)
Thrust restraint: Withstands 1.5× maximum working pressure
Cyclic testing: 10,000 cycles at 1.25× working pressure
Sealing System Performance:
Pressure-activated dual sealing:
Installation Performance:
Bolt-tightened assembly using standard tools
Visual alignment aids for correct gland positioning
Immediate pressure testing capability
3. Utility and Applications
Primary Application Domains:
Water distribution systems and service connections
Municipal waterworks and fire hydrant installations
Industrial process water lines and cooling systems
Building water supply and pump connections
Installation Advantages:
Compact and adaptable for confined spaces
Compatible with ductile iron, PVC, steel, and AC pipes
Allows minor rotation during assembly
All-weather installation capability
Economic Benefits:
30–50% faster installation than flanged systems
Reduced labor and maintenance costs
Long service life (50+ years)
Technical Superiority:
Built-in thrust restraint eliminates external hardware
Excellent vibration damping and thermal compensation
Corrosion-resistant per AWWA C151
Design Features:
TYTON-style push-on joint with mechanical gland restraint
Cement mortar lining per AWWA C104
Zinc or epoxy coating per AWWA C116
Conclusion:
Ductile Iron Mechanical Joint Fittings offer a durable, leak-free, and easily installable solution for pressurized water and industrial systems. With built-in thrust restraint, high sealing reliability, and long service life, they deliver exceptional performance and cost-effectiveness across municipal, industrial, and utility applications.
