AWWA C504
Standard Specification

AWWA C504 Butterfly Valves

What AWWA C504 requires for butterfly valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.

What does AWWA C504 require for butterfly valves?

AWWA C504 (Rubber-Seated Butterfly Valves, 3 In. Through 72 In. (76 mm through 1,800 mm), American Water Works Association (AWWA)) sets the design, material and testing requirements for butterfly valves in its scope. 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.

Applicable Pressure Classes

Class 150B (150 psi / PN10)Class 250B (250 psi / PN17)

Key Requirements

  • 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

  • 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

Alternative Standards for Butterfly Valves

Other standards that also govern butterfly valves — useful for spec cross-acceptance.

API 607Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic SeatsASME B16.34Valves - Flanged, Threaded, and Welding EndAPI 598Valve Inspection and TestingAPI 609Butterfly Valves: Double-Flanged, Lug- and Wafer-TypeISO 15848Measurement, Test, and Qualification Procedures for Fugitive Emissions - Industrial ValvesBS 6755Testing of Valves - Production Pressure Testing and Fire Type Testing RequirementsISO 5208Industrial Valves - Pressure Testing of Metallic ValvesISO 10497Testing of Valves - Fire Type-Testing RequirementsEN 593Industrial Valves - Metallic Butterfly ValvesNACE MR0103Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refinery Environments
Reviewed by Valve Standards Engineering, Vajra Industrial SolutionsDiscipline: Industrial Valve Standards & ComplianceLast reviewed: 20 June 2026

Connected Engineering

Standards
ASME B16.34
Products
Butterfly Valves
Comparisons
Ball vs Butterfly Valve
Tools
Pressure Class Converter

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Relevant Products
Vajra Butterfly Valves

Engineering references

AWWA C504 full standardScope, requirements & documentationVajra Butterfly ValvesFull range, specs & standardsStandards Applicability MatrixWhich standard governs which type