Valve Standard Reference
AWWA C504
AmericanRubber-Seated Butterfly Valves, 3 In. Through 72 In. (76 mm through 1,800 mm)
AWWA C504 is the primary standard for rubber-seated (concentric and double-eccentric) butterfly valves in water main and waterworks service — covering drinking water transmission mains, pump stations, water treatment plants, and raw water intake systems.
Overview — AWWA C504
AWWA C504 is the primary standard for rubber-seated (concentric and double-eccentric) butterfly valves in water main and waterworks service — covering drinking water transmission mains, pump stations, water treatment plants, and raw water intake systems. The standard sets requirements for body design, rubber seat materials (NSF/ANSI 61 compliant), disc design, shaft and bearing materials, actuator interface, and pressure testing. AWWA C504 butterfly valves are specified by water utilities, municipal engineers, and contractors worldwide.
Scope
Covers rubber-seated butterfly valves from 3-inch (76 mm) through 72-inch (1,800 mm) for water service. Specifies two working pressure classes: 150 psi (Class 150B) and 250 psi (Class 250B). Includes requirements for flanged ends (AWWA C207 flange drilling pattern), mechanical joint, and push-on ends.
Applicable Valve Types
Butterfly Valves — concentric (centric) rubber seat, DN76–DN1800
Butterfly Valves — double-eccentric (high-performance), larger sizes
Applicable Pressure Classes
Key Requirements — AWWA C504
Body material: ductile iron ASTM A536 Grade 65-45-12, or grey iron ASTM A126 Class B for lower pressure
Disc material: ductile iron ASTM A536 with rubber or stainless-overlay seat contact face
Rubber seat: EPDM, NBR, or neoprene elastomer meeting NSF/ANSI 61 for potable water contact
Shaft material: ASTM A564 Type 630 (17-4 PH SS) or A276 Type 316 SS
Bearings: self-lubricating PTFE or bronze for shaft support
Actuator: AWWA C504 specifies actuator torque requirements — gear operators standard for DN300+
Pressure test: shell test at 1.5× working pressure; seat test at 1.1× working pressure — zero visible leakage
Testing Requirements — AWWA C504
Hydrostatic shell test: 1.5× rated working pressure, 2 minutes, zero visible leakage
Disc seat test: 1.1× rated pressure each direction, 2 minutes, zero visible leakage
Actuator torque test: torque measured at maximum differential pressure before seal test
Documentation Required for AWWA C504 Compliance
NSF/ANSI 61 compliance certificate for rubber seat and body coating in potable water contact
Manufacturer's hydrostatic test certificate with pressure class and test pressures
Dimensional inspection report per AWWA C504 Table 3 (flange face OD, BFV face-to-face)
Actuator torque curve and gear ratio documentation
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