AWWA C505-58 PDF

Full title and description

AWWA C505-58 — AWWA Standard for Metal‑Seated Butterfly Valves. This 1958 AWWA specification covers cast‑iron and steel, flanged‑end, bell‑end, and mechanical‑joint end metal‑seated butterfly valves in sizes 3–72 in., specifying maximum shutoff pressures, allowable line velocities, and torque requirements for operation; it is intended for waterworks service including frequent operation, throttled positions, and operation after periods of idleness.

Abstract

This standard (designation C505‑58) establishes dimensional, material, performance and testing requirements for metal‑seated butterfly valves intended for water distribution systems. The 1958 edition replaced an earlier C505‑55T designation and adds sections addressing operational torque and certain assembly/testing details. The original document is a short technical specification (approximately 16 pages).

General information

• Status: Withdrawn (historic AWWA standard edition from 1958; listed as WITHDRAWN by AWWA's standards store for purchase as an archival/withdrawn item).
• Publication date: 1958 (designation C505‑58).
• Publisher: American Water Works Association (AWWA).
• ICS / categories: 23.060 — Valves (waterworks valve standards / fittings).
• Edition / version: C505‑58 (1958 revision; the standard text notes the change from the previous C505‑55T designation).
• Number of pages: Approximately 16 pages (short technical standard).

Scope

The scope of C505‑58 is limited to metal‑seated butterfly valves for potable waterworks service. It specifies acceptable body and seating materials (cast‑iron and steel bodies with metal seats), permitted end connections (flanged, bell, mechanical joint), nominal size range (3 in. through 72 in.), shutoff and pressure/velocity limits, and operational torque requirements. The document addresses manufacturing and performance requirements needed to ensure reliable shutoff and frequent/throttled operation in distribution systems.

Key topics and requirements

• Valve types and permitted end connections: flanged, bell‑end, and mechanical‑joint metal‑seated butterfly valves (3–72 in.).
• Materials: cast‑iron and steel valve bodies; specified metal seat materials and construction details to achieve tight closure.
• Performance limits: maximum shutoff pressures and acceptable line velocities for safe operation.
• Operational requirements: torque values for valve operation and instructions for testing/verification of torque and shutoff.
• Tests and inspection: acceptance testing procedures and criteria to demonstrate closure performance and mechanical integrity.

Typical use and users

This historic standard was used by water utility engineers, valve manufacturers, procurement/specification engineers, and consulting engineers specifying metal‑seated butterfly valves for distribution and treatment plant applications. Typical uses included specifying valves for high‑duty or abrasive environments where metal seats were chosen for durability or where resilient seats were not acceptable. Modern users consult the document for archival reference, legacy-asset replacement, or historical specification comparison.

Related standards

Related AWWA valve standards in the same general family include AWWA C504 (rubber‑seated butterfly valves), other C500‑series valve standards (gate, check, and ball valve standards such as C508, C509, etc.), and later/alternate specifications that supersede or cover resilient‑seated designs. Users typically cross‑reference C504 and other AWWA valve standards when selecting valve type and seat material for a given service.

Keywords

metal‑seated butterfly valve, AWWA C505, 1958, valve specification, waterworks valves, flanged end, mechanical joint, bell end, torque requirements, shutoff pressure, valve testing

FAQ

Q: What is this standard?

A: AWWA C505‑58 is the American Water Works Association’s 1958 standard titled "Standard for Metal‑Seated Butterfly Valves," which specifies materials, dimensions, performance and test requirements for metal‑seated butterfly valves used in waterworks service.

Q: What does it cover?

A: It covers cast‑iron and steel metal‑seated butterfly valves (3–72 in.) with flanged, bell, or mechanical‑joint ends, including maximum shutoff pressures, allowable line velocities, and operational torque and testing requirements.

Q: Who typically uses it?

A: Historically, water utilities, specifying engineers, valve manufacturers, and contractors used C505‑58 when procuring or manufacturing metal‑seated butterfly valves; today it is consulted mainly for legacy spec reference, historical comparison, or when replacing valves originally specified to that edition.

Q: Is it current or superseded?

A: The 1958 edition is a historic edition and is listed as withdrawn in AWWA’s standards store; users should consult current AWWA valve standards (and any subsequent revisions or replacement documents) for live specifications.

Q: Is it part of a series?

A: Yes — it belongs to AWWA’s C500 series of valve standards covering various valve types for waterworks service (C504, C505, C508, C509, etc.); cross‑references and complementary standards are commonly used together when specifying valves for water systems.

Q: What are the key keywords?

A: Metal‑seated butterfly valve, AWWA C505, waterworks valves, shutoff pressure, torque requirements, flanged end, mechanical joint, bell end.