SIST EN 14455:2005
(Main)Devices to prevent pollution by backflow of potable water - Presssurised air inlet valves DN 15 to DN 50 - Family L, type A and type B
General Information
- Abstract
This document specifies:
a) field of application;
b) requirements for pressurised air inlet valves;
c) dimensional and the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic design of pressurised air inlet valves DN 15 to DN 50;
d) test procedure and requirements for verifying these properties;
e) marking and presentation;
f) acoustics.
This document specifies the characteristics of pressurised air inlet valves DN 15 to DN 50 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and temperatures up to 65 °C and for 1 h at 90 °C.
- Status
- Published
- Publication Date
- 31-Aug-2005
- Technical Committee
- IOVO - Water supply and waste water engineering
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Sep-2005
- Due Date
- 01-Sep-2005
- Completion Date
- 01-Sep-2005
Overview
EN 14455:2005 (CEN) defines requirements for pressurised air inlet valves used to prevent pollution by backflow in potable water installations. The standard covers devices of Family L, type A and B in nominal sizes DN 15 to DN 50 (thread sizes ½" to 2") intended for drinking-water systems up to 1 MPa (10 bar) and temperatures up to 65 °C (and for 1 hour at 90 °C). EN 14455 specifies design, physico‑chemical properties, dimensional data, performance tests, marking, presentation and acoustic characteristics.
Key topics and requirements
- Field of application: LA (air inlet) and LB (air inlet combined with downstream check valve) devices for protection against back-siphonage.
- Design & dimensions: Nominal sizes DN 15–50 (thread sizes per ISO 7‑1); external air inlets ≥ 4 mm and shrouded to avoid blockage.
- Materials & corrosion:
- Materials in contact with drinking water must comply with potable‑water regulations.
- Corrosion resistance (ISO 9227) and low scaling are required.
- Dezincification resistance for copper‑zinc alloys per EN ISO 6509; DR marking rules apply where required.
- Marking & documentation:
- Permanent marking: manufacturer, flow direction arrow, DN, family/type and (for ≤ DN 32) acoustic group.
- Technical documentation must include purpose, installation and maintenance instructions, minimum installation height and spare parts.
- Performance & testing:
- A defined test sequence (visual, mechanical strength, tightness, flow/pressure loss, vacuum/fast operation, bending moment/leak tightness, opening pressure, endurance, acoustics).
- Example hydraulic requirement: minimum flow rates at 0.015 MPa differential (e.g., DN 20 = 0.7 l/s, DN 50 = 4.9 l/s).
- Mechanical strength test up to 2.5 MPa (25 bar) and tightness cycling requirements.
- Acoustics: Classification and testing in accordance with referenced acoustics standards for devices (acoustic groups indicated for DN ≤ 32).
Applications & who uses it
- Designers and consultants specifying backflow protection in municipal and building drinking water systems.
- Manufacturers of pressurised air inlet valves for product development, testing and CE/national compliance.
- Water utilities, installers and contractors implementing compliant protective devices.
- Test laboratories and certification bodies performing the standardized test sequence.
- Regulators and procurement teams referencing harmonized European requirements for potable-water safety.
Related standards
- EN 1717 (protection against pollution of potable water)
- EN 13959 (anti‑pollution check valves, family E)
- EN 806‑1 (internal water installations)
- EN ISO 228‑1 / ISO 7‑1 (pipe thread dimensions)
- EN ISO 3822 (acoustics), EN ISO 5167‑1 (flow measurement), EN ISO 6509, ISO 9227
Keywords: EN 14455:2005, pressurised air inlet valves, backflow prevention, potable water, DN 15 DN 50, Family L, type A, type B.
Relations
- Effective Date
- 11-Mar-2026
- Effective Date
- 11-Mar-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Get Certified
Connect with accredited certification bodies for this standard
DIBt (Deutsches Institut für Bautechnik)
German Institute for Building Technology.
DIN CERTCO
DIN Group product certification.
Kiwa BDA Testing
Building and construction product certification.
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Frequently Asked Questions
SIST EN 14455:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Devices to prevent pollution by backflow of potable water - Presssurised air inlet valves DN 15 to DN 50 - Family L, type A and type B". This standard covers: This document specifies: a) field of application; b) requirements for pressurised air inlet valves; c) dimensional and the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic design of pressurised air inlet valves DN 15 to DN 50; d) test procedure and requirements for verifying these properties; e) marking and presentation; f) acoustics. This document specifies the characteristics of pressurised air inlet valves DN 15 to DN 50 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and temperatures up to 65 °C and for 1 h at 90 °C.
This document specifies: a) field of application; b) requirements for pressurised air inlet valves; c) dimensional and the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic design of pressurised air inlet valves DN 15 to DN 50; d) test procedure and requirements for verifying these properties; e) marking and presentation; f) acoustics. This document specifies the characteristics of pressurised air inlet valves DN 15 to DN 50 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and temperatures up to 65 °C and for 1 h at 90 °C.
SIST EN 14455:2005 is classified under the following ICS (International Classification for Standards) categories: 13.060.20 - Drinking water; 23.060.01 - Valves in general; 91.140.60 - Water supply systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 14455:2005 has the following relationships with other standards: It is inter standard links to SIST ISO 7-1:1995, SIST ISO 9227:1999, SIST EN ISO 228-1:2003, SIST EN ISO 5167-1:2022, SIST EN 1717:2001, oSIST prEN 15116:2005, SIST EN ISO 3822-1:1999, SIST EN 806-1:2001, SIST EN ISO 3822-3:2018, SIST EN 13959:2005, SIST EN ISO 6509-1:2014, SIST EN 3094:2017, SIST EN 806-5:2012, SIST EN 17962:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 14455:2005 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC; Standardization Mandates: M/EXP. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 14455:2005 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.%Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch Rückfließen - Druckbeaufschlagte Rohrbelüfter in Durchflussform DN 15 bis DN 50 - Familie L, Typ A und Typ BDispositifs de protection contre la pollution de l'eau potable par retour - Clapet d'entrée d'air sous pression DN 15 a DN 50 - Famille L, type A et type BDevices to prevent pollution by backflow of potable water - Presssurised air inlet valves DN 15 to DN 50 - Family L, type A and type B91.140.60Sistemi za oskrbo z vodoWater supply systems23.060.01Ventili na splošnoValves in general13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 14455:2005SIST EN 14455:2005en01-september-2005SIST EN 14455:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14455May 2005ICS 13.060.20; 23.060.01English versionDevices to prevent pollution by backflow of potable water -Presssurised air inlet valves DN 15 to DN 50 - Family L, type Aand type BDispositifs de protection contre la pollution de l'eau potablepar retour - Clapet d'entrée d'air sous pression DN 15 à DN50 - Famille L, type A et type BSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rückfließen -Druckbeaufschlagte Rohrbelüfter in Durchflussform DN 15bis DN 50 - Familie L, Typ A und Typ BThis European Standard was approved by CEN on 24 December 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14455:2005: ESIST EN 14455:2005
5 Designation The devices are designated by: a) name; b) reference to this document (EN 14455); c) family, type; d) DN; e) body material; f) acoustic group (≤
DN 32 only).
Example of designation Pressurised air inlet valve, EN 14455, family L, type A, DN 20, gun metal, I SIST EN 14455:2005
Figure 1 — Graphic symbol SIST EN 14455:2005
a) LA: Flow condition and zero condition b) LA: Back siphonage condition
c) LB: Flow condition d) LB: Zero flow condition
e) LB: Back siphonage condition Key 1 Water flow 2 Air Figure 2 — Design principle SIST EN 14455:2005
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