| Feature | | AWWA C111 (Push-on) | AWWA C115 (Flanged) | | :--- | :--- | :--- | :--- | | Assembly Speed | Fast (2-4 bolts per joint) | Moderate (requires lubricant and insertion force) | Slow (10-20 bolts per joint) | | Restrained Joint? | Yes (by design – the groove locks the coupling) | No (requires external thrust blocks or restraints) | Yes (rigid, bolted) | | Angular Deflection | None (rigid joint – 0 to 1 degree max) | 3-5 degrees (flexible) | None (rigid) | | Disassembly | Easy (loosen bolts) | Difficult (requires cutting or specialized tools) | Difficult (requires unbolting, often heavy) | | Best Use | Pump stations, treatment plants, above-ground, temporary bypasses | Long-distance buried transmission | Valve vaults, pump flanges, hydrants | | Thrust Restraint Needed? | No (the joint is self-restraining) | Yes (concrete thrust blocks or Megalug rods) | No (rigid joint) |
Standardization through AWWA C520 provides peace of mind for engineers and utility managers. By specifying a C520-compliant valve, you are guaranteed: awwa c520
but with caution. It is best for restrained straight runs. Avoid burial in unstable soils (e.g., expansive clays) without engineered supports, because the rigid joints cannot articulate. | Feature | | AWWA C111 (Push-on) |
: They are primarily used to isolate pipes in treatment plants. Their "knife" edge allows them to cut through suspended solids (sludge/slurry) that might prevent a standard sluice valve from closing completely. American Water Works Association Where to Access the Standard You can purchase the full current version of the standard ( ANSI/AWWA C520-24 ) through the AWWA Store ANSI Webstore maintenance requirements for these valves? By specifying a C520-compliant valve, you are guaranteed: