AWWA C516 is a standard for large-diameter rubber-sealed butterfly valves developed by the American Water Supply Engineering Association. It applies to valves with a diameter ≥78 inches (2000 mm) and specifies the minimum requirements for their design, materials, testing, and operating conditions.
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Pressure & Velocity Classes
| Pressure Class | Max Working Pressure (psi) | Class Suffix | Max Velocity (ft/s) | Remarks |
| Class 25 | 25 psi | A | 8 ft/s (2.4 m/s) | Suitable for low-pressure intake/gravity lines. |
| Class 75 | 75 psi | B | 16 ft/s (4.9 m/s) | Common class for urban water transmission. |
| Class 150 | 150 psi | A | 8 ft/s (2.4 m/s) | High-pressure distribution systems. |
| Class 250 | 250 psi | B | 16 ft/s (4.9 m/s) | High-pressure, high-velocity industrial/mainline applications. |
Material Specifications (Core Components)
| Component | Common Materials (ASTM Standards) | Key Features / Advantages |
| Body | Ductile Iron A536 / Cast Steel A216 | High pressure capacity and resistance to ground stress. |
| Disc | Ductile Iron / Stainless Steel 304/316 | Optimized flow profile and enhanced corrosion protection. |
| Shaft | SS 304/316 / 17-4PH | High torque transmission with excellent rust resistance. |
| Rubber Seat | EPDM / Buna-N (Nitrile) | EPDM for potable water; Buna-N for oil/hydrocarbon resistance. |
| Bearings | Bronze / Self-lubricating PTFE liners | Long-term maintenance-free operation with low torque. |
Representative Dimensions (Face-to-Face)
| Nominal Size (NPS) | Nominal Size (mm) | Short Series F-to-F (in) | Long Series F-to-F (in) | Typical Weight (kg - Est.) |
| 30" | 750 | 12.0 | 15.0 | 850+ |
| 48" | 1200 | 15.0 | 24.0 | 2,200+ |
| 60" | 1500 | 15.0 | 24.0 | 4,500+ |
| 78" | 2000 | 18.0 | 30.0 | 8,000+ |
| 96" | 2400 | 24.0 | 36.0 | 12,000+ |
| 120" | 3000 | 30.0 | 48.0 | Custom Build |
Performance Testing & Quality Control
| Test Item | Pressure Requirement | Acceptance Criteria |
| Shell Test | 2x Rated Working Pressure | No visible leakage at body/packing; no structural damage. |
| Seat Test | 1x Rated Working Pressure | Bubble-tight or zero-leakage at the rubber seat. |
| Cycle Life Test | Varies by size (500 - 10,000 cycles) | Sealing performance must remain intact after cycling. |
| Coating Inspection | Per AWWA C550 | Epoxy coating thickness must be verified with zero pinholes. |
Applications of AWWA C516 large-diameter rubber-sealed butterfly valves
Municipal Water Supply Systems
1. Raw Water Transmission
2. Water Treatment Plant (WTP) Processes:
- Inlet Control
- Pump Station Isolation
- Finished Water Basins
3. Long-Distance Water Transfer
Power Generation Cooling Systems
- Circulating Water Systems
- Cooling Tower Isolation
- Intake Screen Wash
Wastewater & Industrial Water Treatment
- Secondary Effluent
- Recycled Industrial Water
- Desalination Plants
Flood Control & Drainage Projects
- Large Drainage Pumping Stations
- Hydraulic Structures
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FAQ
What is the difference between AWWA C504 and AWWA C516?
The C504 standard applies to general-purpose rubber-seat butterfly valves with diameters from 3 inches to 72 inches (75 mm to 1,800 mm), which are widely used in conventional water treatment systems; while the C516 standard is designed for extra-large diameter valves, specifying butterfly valves with dimensions of 78 inches (2,000 mm) and above, which are suitable for high-flow, large-diameter main water supply or drainage projects.
What are the three types of butterfly valves?
3 Different Types of Butterfly Valves
Butterfly valves come in different designs tailored to specific applications based on factors like pressure range, connection type and actuation method. The most common types include wafer-style, lug-style and eccentric butterfly valves.
What does AWWA stand for?
The American Water Works Association (AWWA) is the largest organization of water supply professionals in the world. AWWA believes that every water professional deserves to feel empowered and have the tools and resources necessary to provide their communities with safe and clean water.
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