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EN 331:2015 Manually operated ball valves

EN 331:2015 Manually operated ball valves

What is EN 331:2015 Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings?

EN 331:2015 Manually operated ball valves is a European Standard that specifies the requirements and testing methods for manually operated ball valves and closed bottom taper plug valves. These valves are intended for use in gas installations in buildings. The standard encompasses gas supply systems that are used for both residential and non-residential applications, covering the entire range of pressures and temperatures under which these systems are expected to operate.

This standard sets forth the technical specifications, performance requirements, and test procedures to ensure that the valves meet a certain level of quality, reliability, and safety when used in gas installations. This is particularly important as such installations have implications for public safety, energy efficiency, and environmental impact. To be compliant with EN 331:2015, valves must pass rigorous tests and evaluations that assess aspects such as their mechanical durability, resistance to internal and external pressures, tightness, and corrosion resistance, among others.

Manufacturers seeking to demonstrate compliance with this standard often undergo assessments and tests by accredited certification bodies. Once the product passes these evaluations, it may be granted a certification indicating its conformity to the standard, thus facilitating its entry into European markets.

For organizations looking to ensure that the valves used in their gas installations are compliant with EN 331:2015, it would be advisable to consult with a reputable certification body such as Pacific Certifications. Through comprehensive assessment and testing, Pacific Certifications can provide assurance that your valves meet the strict requirements of the standard, thereby promoting safety and operational efficiency.

What are the requirements for EN 331:2015?

The EN 331:2015 standard for manually operated ball valves and closed bottom taper plug valves in gas installations for buildings covers a variety of technical specifications and performance requirements. While a detailed breakdown is available in the full text of the standard, here are some general categories of requirements commonly included:

Material Specifications

  • Material Suitability: The materials used must be suitable for transporting natural gas, LPG, or other types of fuel gas.
  • Corrosion Resistance: Materials must be resistant to corrosion, both internally and externally.

Mechanical Requirements

  • Strength: Valves must be designed to withstand the mechanical stresses likely to be imposed under normal operating conditions.
  • Pressure Rating: Valves must be rated for specific pressure conditions, usually indicated by a nominal pressure rating (PN).
Operational Aspects
  • Leakage: The standard specifies the allowable leakage rates, often requiring zero leakage for safety reasons.
  • Temperature Range: Valves must be able to operate efficiently within a specified temperature range, which usually encompasses the range of temperatures expected in residential and non-residential buildings.
  • Durability: There may be requirements for the operational lifespan of the valve, specifying a minimum number of cycles the valve must withstand while still functioning properly.

Testing Methods

  • Flow Rate: Tests are conducted to measure the flow rate and to ensure it falls within acceptable limits.
  • Mechanical Tests: These include evaluations for mechanical strength, tightness, and durability.
  • Functional Tests: Valves are assessed for their operational effectiveness, including ease of operation, responsiveness, and safety features.

Marking and Documentation

  • Identification: Each valve must be permanently marked with information such as the manufacturer’s name, pressure rating, and material.
  • Documentation: Detailed documentation is required to accompany the product, providing information such as operating instructions, safety warnings, and maintenance guidelines.
Conformity Assessment

Manufacturers typically undergo conformity assessments conducted by accredited certification bodies to validate that their valves meet the EN 331:2015 requirements. The conformity assessment process usually involves both initial type-testing and periodic surveillance of production.

Organizations in need of these types of valves would be well-advised to seek products that have been certified as compliant with EN 331:2015 by a reputable certification body. Such certifications provide assurance of the valves’ quality, performance, and safety features, thereby mitigating risks associated with gas installations in buildings.

What are the benefits of EN 331:2015 Manually operated ball valves?

The EN 331:2015 standard for manually operated ball valves and closed bottom taper plug valves in gas installations offers several key benefits, not only for manufacturers but also for end-users and stakeholders involved in gas supply and distribution systems. Here is a breakdown of these benefits:

Safety Enhancement

  • Reduced Risk of Leakage: By specifying stringent requirements for materials and construction, the standard minimizes the risk of gas leakage, which is crucial for safety.
  • Quality Assurance: The rigorous testing and certification processes ensure that the valves meet high safety standards, thereby providing peace of mind to end-users.

Regulatory Compliance and Market Access

  • Streamlined Legislation: The standard harmonizes the requirements across European countries, making it easier for manufacturers to comply with regulations.
  • Market Penetration: Products that meet EN 331:2015 are generally more readily accepted in the market, as compliance with the standard is often seen as a mark of quality and reliability.

Operational Efficiency

  • Consistency: Standardized products mean that installations and maintenance become more predictable and easier to manage.
  • Durability: The long-term performance of the valves is assured through durability tests, leading to reduced maintenance and replacement costs.
Environmental Benefits
  • Resource Efficiency: By ensuring that the valves are leak-free and operate efficiently over a long lifespan, the standard helps to minimize waste of natural gas, which is a finite resource.
  • Emission Reduction: Efficient and tight valves contribute to lower emissions, thereby reducing the environmental impact of gas installations.

Economic Advantages

  • Cost-Effectiveness: Despite the initial costs of producing or procuring certified valves, the long-term benefits in terms of reduced maintenance and increased operational efficiency often result in cost savings.
  • Competitive Advantage: Manufacturers who comply with this standard can leverage it as a competitive advantage in tenders and negotiations.

Enhanced Trust and Credibility

  • Consumer Confidence: End-users are more likely to trust a product that adheres to recognized standards, enhancing the reputation of manufacturers and suppliers.
  • Stakeholder Assurance: Utilities, regulators, and other stakeholders also value compliance with recognized standards as it simplifies validation processes and enhances overall system integrity.

Overall, for organizations keen on ensuring that their gas installations meet these stringent standards, it is advisable to consult a reputable certification body that can certify the compliance of these valves with the EN 331:2015 standard. By doing so, organizations can benefit from the assurance of quality, performance, and safety, thus fulfilling both operational and regulatory objectives.

Who needs EN 331:2015 Manually operated ball valves?

The EN 331:2015 standard is relevant to various stakeholders involved in the design, production, installation, and management of gas supply systems for buildings. Here are some entities for whom this standard is particularly important:


  • Valve Manufacturers: Companies that produce manually operated ball valves and closed bottom taper plug valves must adhere to the EN 331:2015 standards to ensure their products are safe and reliable for use in gas installations.

Distributors and Retailers

  • Suppliers and Wholesalers: Entities involved in the supply chain need to ensure that the products they distribute are compliant with EN 331:2015 to meet customer demand for certified valves and to fulfill legal obligations.
Installers and Contractors
  • Gas Installation Companies: Organizations or individuals responsible for installing gas systems in buildings need to use valves that meet EN 331:2015 to ensure the safety and reliability of the installations.
  • Building Contractors: Those who oversee building construction often need to ensure that all components, including gas installations, are compliant with relevant standards.

Regulatory Authorities and Inspectors

  • Governmental Agencies: Entities responsible for setting and enforcing regulations related to gas installations often refer to EN 331:2015 as a benchmark for safety and performance.
  • Certification Bodies: Organizations like Pacific Certifications, which issue certifications for products and management systems, rely on EN 331:2015 as a basis for certifying the compliance of valves used in gas installations.

Building Owners and Operators

  • Residential Property Owners: Individuals who own buildings with gas installations may need to ensure that the valves used are compliant for reasons of safety, efficiency, and potential liability.
  • Commercial Property Managers: Managers of commercial properties, such as office buildings, hotels, and industrial facilities, also have an interest in ensuring that gas installations meet the rigorous safety and performance criteria set by EN 331:2015.


  • Consumers: Those who use gas for cooking, heating, or other purposes benefit indirectly from EN 331:2015 because it helps ensure the safety and efficiency of the gas supply system in their homes or workplaces.

Energy and Utility Companies

  • Gas Providers: Companies that provide natural gas or other types of fuel gas have a vested interest in ensuring that the entire distribution chain, including the valves used in customer installations, meet recognized safety standards like EN 331:2015.

Architects and Engineers

  • Design Professionals: Those involved in designing building systems may specify that components used, including valves for gas installations, should be compliant with EN 331:2015 to ensure long-term performance and safety.
Because the EN 331:2015 standard has wide-reaching implications for safety, efficiency, and regulatory compliance, it is an essential guideline for a diverse set of stakeholders involved in the gas supply chain. Compliance with the standard not only ensures the safety and performance of gas installations but also facilitates market access and acceptance for manufacturers and suppliers.

At last, Pacific Certifications is accredited by ABIS, you need more support with EN 331:2015 Manually operated ball valves, please contact us at +91-8595603096 or support@pacificcert.com

Also read: BS EN 13480-1-Metallic industrial piping

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