BS EN 1267-2012 PDF

Full title and description

BS EN 1267:2012 — Industrial valves — Test of flow resistance using water as test fluid. This European/British standard specifies a laboratory method to determine valve pressure loss (ζ) and flow coefficient (Kv/Cv) using water as the test fluid, including test facility and measurement requirements, treatment of test-tube losses, and uncertainty considerations.

Abstract

This standard defines a standardized procedure for measuring the flow resistance of industrial valves when tested with water. It covers test rig configuration, steady and non-steady test procedures, required measurement accuracy and uncertainty evaluation, limits and corrections for test-tube pressure losses, and special flow phenomena (e.g., cavitation and flashing). The method is aimed at valves with relatively low ζ values (ζ > 0.1) and for valves having equal inlet and outlet nominal sizes; industrial process control valves are excluded.

General information

• Status: Current / active (European standard adopted as a national standard: BS EN 1267:2012).
• Publication date: January 2012 (BS publication 31 January 2012; EN approved 26 November 2011).
• Publisher: Published as EN 1267:2012 by CEN; published in the UK catalogue as BS EN 1267:2012 by BSI.
• ICS / categories: 23.060.01 — Valves in general.
• Edition / version: EN 1267:2012 (BS adoption as BS EN 1267:2012). Supersedes EN 1267:1999 / BS EN 1267:1999.
• Number of pages: National reprints list between about 33 and 38 pages depending on publisher formatting (commonly shown as 33–38 pages in national catalogues).

References for the above bibliographic details and national publication data.

Scope

Specifies a method for determining valve pressure loss coefficient (ζ) and fluid flow coefficient using water as the test fluid. The method is suitable for valves with low ζ values but greater than 0.1 and for valves with equal inlet and outlet nominal size. Industrial process control valves are excluded. The standard also states that for ζ values above about 6 the inaccuracy due to test-tube losses becomes significant and testing becomes comparable to methods in other standards (e.g., EN 60534-2-3); alternative methods are recommended for tests with air or for process-control valve types.

Key topics and requirements

• Definition and calculation of pressure loss coefficient (ζ) and flow coefficient (Kv/Cv) for valves tested with water as the test fluid.
• Detailed requirements for test facility (pipework, test tubes, pressure and flow measurement instrumentation) and for subtraction/correction of test-tube losses.
• Test procedure for steady and non-steady conditions, including minimum measurement stability criteria and repetition rules.
• Limits on Reynolds number and guidance on choosing test points (minimum Re, range and intermediate points) to ensure turbulent flow where required.
• Considerations for cavitation and flashing and recommendations to avoid vaporisation during tests unless required by product/application standards.
• Uncertainty evaluation for flow coefficient and pressure-loss measurements (informative annexes on measurement uncertainty and permissible fluctuations).

Typical use and users

Primary users are valve manufacturers (for product characterization and published Kv/ζ data), independent test laboratories and quality/verification teams, procurement and specification engineers (to compare valve pressure loss characteristics), research and development groups, and regulatory or conformity-assessment bodies where standardized flow-resistance data is required. Test houses use this method to provide repeatable, comparable flow-resistance data for valves intended for water service.

Related standards

Standards and documents commonly referenced alongside EN 1267:2012 include the earlier EN 1267:1999 (superseded), EN/ISO documents on flow testing and process-control valve testing (for air or other fluids), and specific parts of EN 60534 and ISO 6358 for air-flow testing and control-valve characteristics. National adoptions and related valve standards such as EN 1074 series (valves for water supply) are also relevant for application-specific testing and requirements.

Keywords

industrial valves, flow resistance, pressure loss coefficient, ζ, flow coefficient, Kv, Cv, water test fluid, test procedure, test rig, measurement uncertainty, cavitation, Reynolds number.

FAQ

Q: What is this standard?

A: EN 1267:2012 (adopted as BS EN 1267:2012) is a European/British standard that specifies a laboratory test method to determine the flow resistance (pressure loss coefficient ζ) and flow coefficient of industrial valves when tested with water as the test fluid.

Q: What does it cover?

A: It covers test rig configuration, measurement instrumentation and accuracy, steady and non-steady test procedures, data treatment (including subtraction of test-tube losses), limits and corrections, and uncertainty evaluation. It is aimed at valves with ζ > 0.1 and equal inlet/outlet nominal sizes; process-control valves are excluded.

Q: Who typically uses it?

A: Valve manufacturers, independent test laboratories, specification and procurement engineers, R&D teams and conformity-assessment bodies that need standardized, repeatable measurements of valve flow resistance in water service.

Q: Is it current or superseded?

A: EN 1267:2012 supersedes EN 1267:1999. As published in 2012 and adopted by national bodies (e.g., BSI as BS EN 1267:2012), it is the valid edition produced in 2012; users should check their national standards catalogue for any later amendments or confirmations.

Q: Is it part of a series?

A: It is a standalone CEN technical standard for valve flow-resistance testing but is often used together with other valve standards (for example the EN 1074 family for water-supply valves) and with standards for testing with other fluids or for control valves (EN 60534 series, ISO 6358).

Q: What are the key keywords?

A: Valves, flow resistance, pressure loss coefficient (ζ), flow coefficient (Kv/Cv), water test fluid, test method, measurement uncertainty, cavitation, Reynolds number.