Overview
ISO 16136:2006/Amd 1:2019 is an important amendment to the international standard for industrial butterfly valves made from thermoplastic materials. Established by the International Organization for Standardization (ISO), this update offers revised guidelines and specifications for the design, testing, and marking of butterfly valves constructed from plastic materials such as ABS, PE, PP, PVC-C, PVC-U, and PVDF. The standard ensures these valves meet stringent quality and performance criteria for industrial fluid transport systems.
This amendment reflects changes in normative references, testing procedures, and material specifications, contributing to better safety, reliability, and global harmonization of butterfly valves of thermoplastic material.
Key Topics
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Scope and Material Options
Defines the applicability to butterfly valves made from specific thermoplastics including acrylonitrile-butadiene-styrene (ABS), polyethylene (PE), polypropylene (PP), chlorinated polyvinyl chloride (PVC-C), unplasticized polyvinyl chloride (PVC-U), and polyvinylidene fluoride (PVDF).
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Normative References Update
Incorporates latest standards for piping components, valve dimensions, testing methods, and mechanical properties. Obsolete references have been removed or relegated to the bibliography for clearer relevance.
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Design and Dimensions
Face-to-face dimensions conform primarily to EN 558 standards for flanged pipe systems, while manufacturers are responsible for dimensions in other connections.
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Testing and Performance Requirements
- Pressure resistance and long-term behavior tests executed per ISO 1167-1
- Strength tests on body and bonnet materials aligning with ISO 9393-2
- Verification of seat and packing leaktightness, ensuring valve tightness under pressure
- Permissible manual operating forces defined as per EN 12570 for ease of use and safety
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Marking and Documentation
Requirements for valve marking include DN size, pressure rating (PN or Class), body material, manufacturer identification, and seat/seal materials, ensuring traceability and regulatory compliance.
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Temperature and Rating Factors
Provides minimum rating factors for valve body materials across different temperatures, supporting durability and long service life under various operating conditions.
Applications
ISO 16136 butterfly valves of thermoplastic materials are widely used in industries requiring reliable fluid control with chemical resistance, corrosion protection, and lightweight components. Typical application areas include:
- Chemical and pharmaceutical processing plants
- Water and wastewater treatment systems
- Food and beverage manufacturing
- Agricultural irrigation systems
- HVAC and industrial piping systems
The standard ensures that valves perform safely under pressure cycles and diverse temperatures, enabling engineers and designers to specify valves confidently for new installations or maintenance projects.
Related Standards
This amendment references and aligns with several critical standards to maintain compatibility and harmonization in industrial fluid handling components:
- ISO 1167-1 - Thermoplastics pipes and fittings internal pressure resistance test method
- EN 558:2017 - Industrial valve face-to-face and center-to-face dimensions for flanged connections
- ISO 9393-2 - Design strength and pressure testing of valve components
- EN 12570 - Valves manual force requirements and operating mechanisms
- ISO 12162:2009 - Classification and design coefficients for thermoplastic piping materials
- EU Directive 2014/68/EU (Pressure Equipment Directive) - Regulatory framework for pressure equipment including plastic valves
Compliance with this updated standard supports conformity with global industry best practices and European regulatory requirements, fostering safer and more effective industrial valve solutions.
By adhering to ISO 16136:2006/Amd 1:2019, manufacturers and users ensure thermoplastic butterfly valves meet enhanced quality, functionality, and traceability standards critical for modern industrial piping systems.
