EN 1704:1997

Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after temperature cycling under bending

This standard specifies a method for determining the leaktightness and ease of operation of a valve under bending following the application of temperature cycling. This standard is applicable to thermoplastic valves with DN 63 or smaller.

Kunststoff-Rohrleitungssysteme - Thermoplast-Armaturen - Prüfverfahren der Unversehrtheit einer Armatur nach Temperaturwechseln unter Biegung

Diese Norm legt ein Verfahren zur Bestimmung der Dichtheit und Leichtgängigkeit einer Armatur, nach erfolgten Temperaturwechseln unter Biegung, fest. Diese Norm bezieht sich auf Armaturen, aus Thermoplasten, mit einem DN kleiner oder gleich 63 mm.

Systèmes de canalisations en plastique - Robinets thermoplastiques - Méthode d'essai pour la vérification d'un robinet après des cycles thermiques sous flexion

Cette norme prescrit une méthode pour déterminer l'étanchéité et la facilité de manoeuvre d'un robinet sous flexion après l'avoir soumis à des cycles thermiques. Cette norme s'applique aux robinets thermoplastiques de DN 63 ou inférieur.

Cevni sistemi iz polimernih materialov - Ventili iz plastomernih materialov - Metode za preskus neoporečnosti ventila, ki je bil podvržen izpostavljen cikličnim spremembam temperature in upogibanju

General Information

• Status: Published
• Publication Date: 21-Jan-1997
• ICS: 23.060 - Valves
• Technical Committee: CEN/TC 155 - Plastics piping systems and ducting systems
• Drafting Committee: CEN/TC 155/WG 32 - Valves
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 08-May-2025
• Completion Date: 23-Sep-2025
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Ref Project: SIST EN 1704:1999 - Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after temperature cycling under bending

Overview

EN 1704:1997 is a European standard developed by CEN that specifies a test method for assessing the integrity of thermoplastic valves used in plastics piping systems. Specifically, this standard focuses on valves with a nominal diameter (DN) of 63 or smaller. The key objective is to determine the leaktightness and operational ease of a valve after it has undergone temperature cycling under bending stress. This ensures the valve's reliability and durability when subjected to real-life conditions that involve both temperature fluctuations and mechanical deformation.

This standard is crucial for manufacturers, quality control engineers, and testing laboratories involved in the production and certification of thermoplastic valves for piping systems.

Key Topics

• Thermoplastics Valves: Focus on valves made from thermoplastic materials commonly used in plastic piping installations.
• Temperature Cycling: Simulates real operating environments by repeatedly exposing valves to varying temperatures.
• Bending Stress: Applies mechanical bending to the valve during temperature cycling to evaluate its structural and functional response.
• Integrity Testing: Measures leaktightness to ensure no medium escapes through or around the valve after testing.
• Ease of Operation: Verifies that valves remain easy to operate even after harsh temperature and mechanical cycling.
• Nominal Diameter Limitations: Applicable specifically for valves up to DN 63, covering many standard residential and commercial applications.

Applications

EN 1704:1997 is primarily applied in contexts where thermoplastic valves must maintain performance and safety under fluctuating temperature and stress conditions, such as:

• Residential Plumbing: Ensuring tap valves and shut-offs maintain integrity through seasonal temperature changes.
• Industrial Piping Systems: Certification of valves in processes involving temperature variations and mechanical loads.
• Water Distribution Networks: Validation of valve performance in outdoor or semi-exposed infrastructures.
• Quality Assurance: Supporting manufacturers in delivering products that comply with stringent European quality expectations.
• Product Development: Guiding design improvements for better durability and reliability of plastic valves.

This testing standard helps reduce failure risks and enhances confidence in thermoplastic valve performance under practical field conditions.

Related Standards

For comprehensive quality and safety management related to thermoplastic piping systems and their components, the following standards are often referenced alongside EN 1704:1997:

• EN ISO 1452 - Plastics piping systems for water supply and drainage.
• EN 1212 - Valves for plastics piping systems - General requirements.
• EN 1178 - Thermoplastics piping systems - Valves for pressure applications.
• ISO 15874 - Plastics piping systems for hot and cold water installations.
• EN 12201 - Plastics piping systems for potable water, including polypropylene systems.

These standards collectively cover design, testing, materials, and performance aspects for plastic piping components and contribute to harmonized regulatory compliance across Europe.

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By adhering to EN 1704:1997, manufacturers and testing bodies ensure that thermoplastic valves used in piping systems perform reliably after temperature cycling and mechanical stress, thereby safeguarding end-users and maintaining system integrity in critical applications.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoff-Rohrleitungssysteme - Thermoplast-Armaturen - Prüfverfahren der Unversehrtheit einer Armatur nach Temperaturwechseln unter BiegungSystemes de canalisations en plastique - Robinets thermoplastiques - Méthode d'essai pour la vérification d'un robinet apres des cycles thermiques sous flexionPlastics piping systems - Thermoplastics valves - T
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