ISO 10631-2021 PDF

Full title and description

ISO 10631:2021 — Industrial valves — Metallic butterfly valves. This International Standard specifies general requirements for the design, materials, pressure/temperature ratings, testing, marking and inspection of metallic-body butterfly valves for use in flanged or butt-welded piping systems; provided as a PDF edition published in 2021.

Abstract

ISO 10631:2021 establishes general requirements for metallic butterfly valves including acceptable body materials (steel, cast iron, ductile iron, copper alloys), nominal sizes (DN and NPS ranges), applicable pressure designations (PN and Class), design and dimensional requirements, minimum wall thickness guidance, disc and shaft requirements, allowable leakage, testing and inspection, and an example valve data sheet. It replaces the 2013 edition and expands pressure ratings and technical requirements.

General information

• Status: Published.
• Publication date: May 2021.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.060.99 (Valves).
• Edition / version: 3rd edition (ISO 10631:2021), cancels and replaces ISO 10631:2013.
• Number of pages: 21 (official ISO pagination).

Scope

Applies to metallic butterfly valves used for general industrial applications in flanged or butt-welded piping systems. The standard lists covered nominal sizes (DN from DN 40 up to DN 2 400 and corresponding NPS sizes) and pressure designations (PN 2.5 up to PN 100 and Class 25 to Class 600), and notes that additional application-specific standards can impose further requirements for sectors such as water, chemical/petrochemical, and oil & gas.

Key topics and requirements

• Design requirements including face-to-face dimensions (reference to ISO 5752) and options for concentric or eccentric disc designs.
• Material specifications for body, disc, shaft and seat (steel, cast iron, ductile iron, copper alloys and associated requirements).
• Pressure/temperature ratings and marking of any reduced pressure/temperature limits.
• Minimum wall thickness determination (references to recognized design codes and standards such as EN and ASME documents for specific materials/sizes).
• Disc and shaft requirements including anti-ejection features and clearances between disc and pipe.
• Actuation, forces/torques for manual operation, and securing of adjustable stops.
• Leakage/allowable leakage rate, flow velocity guidance, testing, inspection and preparation for dispatch.
• Example valve data sheet (informative annex) and guidance on marking and documentation.

Typical use and users

Used by valve manufacturers, design and mechanical engineers, procurement and quality teams, testing and inspection bodies, and end-users across water utilities, chemical and petrochemical plants, oil & gas installations, power plants and general industrial piping systems where metallic butterfly valves are specified. The standard is used to ensure interchangeability, safety and minimum performance across industrial applications.

Related standards

ISO 5752 (face-to-face and mounting dimensions) and other referenced design/pressure standards are cited for dimensional and pressure containment requirements; EN standards (for wall thickness and pressure ratings) and ASME B16.x standards (for flange/welded end design and pressure ratings) are referenced in guidance where applicable. The 2021 edition updates normative references and aligns with related valve and piping standards used in industry.

Keywords

butterfly valve, metallic butterfly valve, industrial valves, ISO 10631, pressure ratings, PN, Class, DN, NPS, face-to-face dimensions, valve testing, valve design, valve materials, valve marking, ISO/TC 153.

FAQ

Q: What is this standard?

A: ISO 10631:2021 is the International Standard that sets general technical requirements for metallic butterfly valves used in industrial piping systems.

Q: What does it cover?

A: It covers design, materials, pressure/temperature ratings, dimensional requirements, testing, marking, inspection and includes an example valve data sheet; it specifies nominal sizes and pressure classes applicable to metallic butterfly valves.

Q: Who typically uses it?

A: Valve manufacturers, mechanical and piping engineers, procurement and quality assurance teams, testing/inspection organizations, and end users in water, chemical, petrochemical, oil & gas and other industrial sectors.

Q: Is it current or superseded?

A: Current — ISO 10631:2021 is the 3rd edition and cancels and replaces ISO 10631:2013.

Q: Is it part of a series?

A: It is part of ISO's bodies of standards for valves (work by ISO/TC 153) and cross-references other dimensional and pressure/containment standards (for example ISO 5752, various EN and ASME pressure/flange standards) that together govern valve design and piping interfaces.

Q: What are the key keywords?

A: Metallic butterfly valve, industrial valves, DN, NPS, PN, valve testing, valve design, face-to-face dimensions, ISO 10631.