ANSI AWWA C504-23 PDF

Full title and description

ANSI/AWWA C504-23 — Rubber-Seated Butterfly Valves. This American Water Works Association (AWWA) standard establishes minimum requirements for rubber-seated butterfly valves used in potable and nonpotable waterworks service, including dimensional, material, performance, testing, and marking requirements for valves intended for raw water, potable water, wastewater, and reclaimed water applications.

Abstract

This standard covers rubber-seated (resilient-seated) concentric butterfly valves in nominal sizes 3 in. (75 mm) through 72 in. (1,800 mm), various body and end types, with design limits including a maximum steady-state working pressure and differential pressure up to 250 psi (1,723 kPa), permitted fluid velocities up to 16 ft/s for B-rated valves, and service temperature and pH ranges typical for waterworks (about 33°F–125°F / 0.6°C–52°C; pH ~6–12). It defines body types, pressure classes, seat and shaft requirements, coatings, and required performance and hydrostatic/leakage testing.

General information

• Status: Current standard (ANSI/AWWA C504:2023).
• Publication date: 2023 (published August 1, 2023, listed as the 2023 edition).
• Publisher: American Water Works Association (AWWA).
• ICS / categories: Valves — ICS 23.060 (valves / valves in general); also relevant to waterworks and building installations (example ICS references: 23.060, 23.060.01 and related installation categories).
• Edition / version: 2023 edition — ANSI/AWWA C504-23 (supersedes the 2015 edition).
• Number of pages: Approximately 60 pages (published-format listing).

Scope

The standard applies to rubber-seated butterfly valves (concentric type) intended for waterworks service in sizes from 3 in. to 72 in., and for body types including wafer, short-body flanged, long-body flanged, and mechanical-joint-end constructions. It specifies classifications by pressure class (e.g., Class 25A/25B/75A/75B/150A/150B/250B depending on body type and size), flow-rate designations (A and B designations related to permitted fluid velocity), materials of construction (disc, shaft, seat materials), seat configuration (rubber-in-body or recessed seats, field replacement/adjustment requirements for larger valves), coating and NSF/ANSI 61 compatibility, and required factory tests (hydrostatic, leakage, proof-of-design and operational tests).

Key topics and requirements

• Valve sizes and body types: wafer, short- and long-body flanged, mechanical-joint ends for specified size ranges.
• Pressure classes and flow-rate designations: numeric pressure classes (e.g., 150, 250) and A/B velocity designations (A = up to ~8 ft/s; B = up to ~16 ft/s).
• Service limits: temperature and pH ranges appropriate for waterworks (approx. 33°F–125°F / pH 6–12) and maximum steady-state pressures up to 250 psi.
• Seat design and materials: recessed or vulcanized rubber seats (EPDM, NBR/Buna‑N, or other approved elastomers), seat replacement/adjustability requirements (especially for larger sizes), and bonding details.
• Shafts, bearings and seals: stainless steel shafts (typical grades), sleeve or self-lubricating bearings, chevron-type shaft seals or equivalent to meet leakage and durability requirements.
• Coatings and lining: interior/exterior workshop coatings meeting AWWA coating requirements (e.g., AWWA C550) and NSF/ANSI 61 compatibility where applicable.
• Testing: hydrostatic body tests, seat leakage tests, operational/actuation cycling, and proof-of-design/type tests at specified test pressures (including tests at 1.1× rated pressure for leakage and 2× rated pressure for body strength where specified).
• Actuation and mounting: requirements for manual and automatic actuators, ISO/AWWA mounting interfaces (where applicable), and ability to hold intermediate positions for throttling.
• Marking and documentation: marking of size, class, manufacturer, materials, and provision of test reports and instructions for installation/maintenance.

Typical use and users

Primary users include municipal and utility engineers, waterworks operators, pipeline designers, valve manufacturers and buyers, specifying engineers, and procurement teams for water and wastewater infrastructure. Typical applications are line isolation and flow control in potable water mains, wastewater and reclaimed water systems, treatment plants, pump stations, and distribution mains. The U.S. Bureau of Reclamation and other agencies list AWWA valve standards (including C504) among referenced design standards for water projects.

Related standards

Commonly referenced or related documents include AWWA C111/A21.11 (mechanical joint dimensions and requirements for joints), AWWA C550 (protective interior coatings for valves), NSF/ANSI/CAN 372 (lead content requirements where applicable), and other AWWA standards for valve installation and actuator interfaces (for example ANSI/AWWA C600 for ductile‑iron mains installation and AWWA actuator standards). The 2023 edition supersedes AWWA C504:2015.

Keywords

butterfly valve, rubber-seated, resilient seat, AWWA C504, ANSI, waterworks, valve standard, hydrostatic test, NSF/ANSI 61, valve classes, wafer valve, flanged valve, mechanical joint.

FAQ

Q: What is this standard?

A: ANSI/AWWA C504-23 is the AWWA standard that specifies minimum requirements for rubber-seated (resilient-seated) butterfly valves used in waterworks service, including dimensions, materials, performance, testing and marking.

Q: What does it cover?

A: It covers concentric rubber‑seated butterfly valves in sizes 3 in. through 72 in., multiple body and end configurations, pressure classes up to 250 psi, acceptable service temperature/pH ranges, seat and shaft requirements, coatings, and required factory testing and documentation.

Q: Who typically uses it?

A: Municipal and utility engineers, specifying engineers, valve manufacturers and fabricators, procurement/specification teams, and operators of water/wastewater systems. Agencies and owners reference it for procurement and acceptance of rubber‑seated butterfly valves.

Q: Is it current or superseded?

A: The 2023 edition (ANSI/AWWA C504-23) is the current edition and supersedes the 2015 edition.

Q: Is it part of a series?

A: Yes — C504 is part of the AWWA valve standards family (for example C500 series items such as C500/C503/C504/C550 series cover gate valves, butterfly valves, actuators, and related valve/coating requirements) and is commonly used alongside other AWWA standards for installation and materials.

Q: What are the key keywords?

A: Rubber-seated butterfly valve, resilient seat, AWWA C504, valve class, wafer/long-body/short-body, mechanical joint, hydrostatic test, NSF/ANSI 61, potable water.