Butterfly Valve En558 1 13 Series: Structure, Specifications, and Common Industry Applications

Types of Butterfly Valves – EN 558-1/13 Series

The EN 558-1/13 series butterfly valves are essential components in industrial fluid control systems, designed to regulate, isolate, or throttle the flow of liquids, gases, and slurries in piping networks. These standardized valves ensure interchangeability and dimensional compatibility across manufacturers, making them a reliable choice for engineering and maintenance teams.

Available in several configurations, each type of butterfly valve offers distinct advantages tailored to specific operating conditions such as pressure, temperature, media type, and sealing requirements. Understanding these differences is crucial for optimal system performance and longevity.

Off-Center Butterfly Valves

Also known as eccentric butterfly valves, these feature a disc that is intentionally offset from the central axis of the valve body. This design ensures that the disc only makes contact with the seat at the fully closed position.

Advantages

• Reduced wear due to minimal seat contact during operation
• Improved sealing performance over time
• Ideal for viscous fluids and slurry applications
• Lower maintenance needs compared to concentric designs

Limitations

• Slightly more complex design than centerline valves
• May require precise alignment during installation
• Not suitable for extremely high-pressure environments

Best for: Wastewater treatment, pulp & paper, and abrasive media handling

Double Offset Butterfly Valves

These valves incorporate two mechanical offsets: one from the centerline of the bore to the centerline of the disc, and another from the centerline of the stem. This dual eccentricity allows the disc to "cam" away from the seat upon opening, minimizing friction and wear.

Advantages

• Excellent sealing with reduced torque requirements
• Suitable for high-pressure and high-temperature applications
• Long service life due to minimized seat abrasion
• Commonly used in steam, oil, and gas systems

Limitations

• Higher initial cost than resilient seated types
• Requires proper actuator sizing for optimal performance
• Not ideal for frequent throttling in corrosive environments

Best for: Industrial process control, steam lines, and medium to high-pressure gas services

Triple Offset Butterfly Valves

Featuring three geometric offsets—axial, radial, and angular (conical seat)—this advanced design eliminates any rubbing between the disc and seat during operation. The metal-to-metal seating provides a bi-directional, bubble-tight shut-off.

Advantages

• Bubble-tight sealing performance (zero leakage)
• Capable of handling extreme temperatures and pressures
• Ideal for critical isolation in hazardous or flammable media
• No maintenance sealing surface contact during cycling

Limitations

• Premium pricing due to complex manufacturing
• Heavier and more complex than other types
• Typically requires automated actuation

Best for: Oil & gas pipelines, power plants, and cryogenic applications

Resilient Seated Butterfly Valves

These use a flexible elastomeric seat (typically EPDM, NBR, or Viton) that deforms around the disc to create a tight seal. Known for their simplicity and reliability, they are among the most widely used butterfly valve types in general service applications.

Advantages

• Cost-effective solution for low to medium pressure systems
• Excellent sealing even with minor pipe misalignment
• Lightweight and easy to install or replace
• Available with manual, electric, or pneumatic actuators

Limitations

• Limited temperature and pressure range
• Elastomer degradation in harsh chemical environments
• Not suitable for abrasive slurries over long periods

Best for: Water supply, HVAC, chemical processing, and wastewater systems

Expert Tip: When selecting an EN 558-1/13 butterfly valve, always verify compatibility between the valve material, seat type, and the media being controlled—especially in high-temperature, corrosive, or abrasive environments. Proper selection ensures long-term reliability and minimizes downtime.

Industrial Applications of Butterfly Valve EN 558-1 13 Series

The EN 558-1 13 series butterfly valves are engineered to meet stringent European standards for face-to-face dimensions, ensuring interchangeability and seamless integration into diverse industrial piping systems. These valves are widely used across multiple sectors due to their compact design, cost-efficiency, and reliable performance in flow regulation and isolation. Their quarter-turn operation enables fast response times, while their lightweight construction reduces structural load and simplifies installation. Below is a comprehensive overview of their key industrial applications, highlighting performance benefits and operational advantages.

Water and Wastewater Management

In municipal and industrial water treatment systems, butterfly valves EN 558-1 13 series play a critical role in managing the flow of raw water, treated water, and effluent. These valves are commonly installed in intake lines, filtration units, pumping stations, and distribution networks, where they provide rapid shut-off and isolation during maintenance or emergency scenarios.

In wastewater environments, the valves handle sludge, sewage, and highly viscous fluids, often under abrasive conditions. Their resilient seat designs—typically made from EPDM or NBR rubber—offer excellent sealing performance and resistance to biological growth. Additionally, the corrosion-resistant materials such as ductile iron with epoxy coating or stainless steel ensure long-term durability in wet and chemically aggressive settings.

Due to their compact size and low torque requirements, these valves are ideal for confined underground vaults and large-diameter pipelines. Their ease of cleaning and minimal pressure drop contribute to energy-efficient system operation and reduced lifecycle costs.

Chemical Processing

In chemical manufacturing and processing plants, WBF 558 series butterfly valves are employed to control the flow of corrosive and reactive media such as sulfuric acid, caustic soda, chlorine, and organic solvents. Constructed from high-performance materials like 316 stainless steel, PVC-U, PP, and PVDF, these valves resist chemical degradation and maintain integrity under continuous exposure.

The full-port design minimizes clogging and allows for smooth passage of slurries or viscous compounds. Their quarter-turn actuation enables precise and rapid flow adjustments, which is essential in batch mixing, reaction control, and transfer operations. Many installations integrate these valves with pneumatic or electric actuators and digital control systems (e.g., PLCs) for automated process regulation.

Compliance with EN 558-1 ensures standardized dimensions for easy replacement and system scalability. Lined variants with PTFE or FPM seals are often used in ultra-pure or high-purity chemical applications to prevent contamination and ensure leak-tight performance.

Oil and Gas Industry

Within the oil and gas sector, advanced variants such as triple offset butterfly valves (TOV) conforming to EN 558-1 13 series dimensions are utilized in high-pressure and high-temperature environments. These include upstream production, midstream pipeline transmission, and downstream refining operations.

They are particularly effective in controlling the flow of natural gas, steam, liquefied petroleum gas (LPG), and crude oil. The metal-to-metal sealing mechanism of triple offset designs eliminates elastomer degradation, ensuring bubble-tight shutoff even after prolonged service under extreme thermal cycling.

Compared to traditional ball or gate valves, butterfly valves offer significant advantages in weight, space, and maintenance. Their lower torque requirement reduces actuator size and energy consumption. In offshore platforms and remote installations, where space and weight are critical, these valves provide a compact, reliable solution for isolation and throttling duties.

HVAC Systems

In commercial and residential heating, ventilation, and air conditioning (HVAC) systems, resilient-seated butterfly valves are widely used to regulate chilled water, hot water, and glycol mixtures in hydronic loops. Their ability to modulate flow precisely helps maintain thermal balance across large buildings, improving energy efficiency and occupant comfort.

These valves are integrated into building management systems (BMS) via actuated controls, allowing remote monitoring and dynamic adjustment based on real-time temperature and load demands. Their lightweight construction and simple mounting requirements make them ideal for mechanical rooms with limited space.

Designed for medium to low-pressure applications, resilient-seated models provide excellent sealing with minimal leakage. The standardization under EN 558-1 ensures compatibility with pumps, chillers, and heat exchangers from various manufacturers, facilitating easier system design and maintenance.

Important: Always verify valve material compatibility with the process media and operating conditions (temperature, pressure, pH). Improper selection can lead to premature failure, safety hazards, or contamination. Consult manufacturer datasheets and industry standards (e.g., ISO, API, DIN) when specifying EN 558-1 13 series butterfly valves for critical applications.

Product Specifications and Features of Butterfly Valves – EN 558-1/13 Series

Butterfly valves conforming to the EN 558-1/13 standard are essential components in industrial fluid control systems, offering a reliable, cost-effective, and compact solution for regulating the flow of liquids, gases, and slurries in pipelines. Widely used across water treatment, chemical processing, HVAC, power generation, and marine industries, these valves ensure precise flow control with minimal pressure drop and excellent sealing performance.

Material Specifications

The materials used in EN 558-1/13 butterfly valves are carefully selected to ensure compatibility with various media, environmental conditions, and operational demands. Each component—body, disc, and seat—is engineered for durability, corrosion resistance, and long-term sealing integrity.

• Body Materials

  Valve bodies are typically constructed from:

  • Cast Iron: Economical and widely used in water and wastewater systems due to good corrosion resistance and mechanical strength.
  • Carbon Steel: Offers superior strength and durability for high-pressure applications in oil & gas, steam, and industrial processes.
  • Stainless Steel (e.g., SS304, SS316): Ideal for corrosive environments, chemical processing, and food-grade applications due to excellent resistance to oxidation, acids, and high temperatures.
• Disc Materials

  The disc is the primary flow-controlling element and is often matched to the body material for chemical compatibility. Common choices include:

  • Stainless Steel: Resists corrosion and erosion in aggressive media such as seawater, acids, and chlorinated environments.
  • Aluminum Bronze: Preferred in marine and offshore applications due to its excellent wear resistance, anti-galling properties, and low susceptibility to biofouling.
  • Ductile Iron or Coated Carbon Steel: Used in cost-sensitive applications with moderate corrosion exposure.
• Seat Materials

  The seat ensures a tight shut-off and is critical for leakage prevention. Common elastomeric and thermoplastic materials include:

  • NBR (Nitrile Butadiene Rubber): Resistant to oils, fuels, and aliphatic hydrocarbons; suitable for industrial and hydraulic systems.
  • EPDM (Ethylene Propylene Diene Monomer): Excellent for water, steam, and weather-resistant applications; operates effectively at higher temperatures.
  • Viton® (FKM): Offers outstanding resistance to a broad range of chemicals, solvents, and high temperatures—ideal for chemical processing and pharmaceutical industries.
  • PTFE (Teflon®): Used in high-temperature and ultra-corrosive environments; provides near-universal chemical resistance and low friction.

Technical Parameters

EN 558-1/13 standardizes key dimensional and performance criteria to ensure interchangeability and reliable operation across different manufacturers and installations.

• Dimensions & Face-to-Face Length

  The standard specifies precise face-to-face dimensions to ensure compatibility with piping systems. For example:

  • DN 100 valve: Face-to-face length ≈ 130 mm (per EN 558-1 Series 13)
  • DN 150 valve: ≈ 178 mm
  • DN 200 valve: ≈ 190 mm

  The disc diameter is typically 30–40% smaller than the internal pipe diameter to allow for smooth rotation and minimal flow obstruction when fully open.

• Pressure Rating

  Pressure ratings vary by size, material, and temperature. Typical PN (Pressure Nominal) ratings include:

  • PN 10: Up to 10 bar (145 psi) for larger valves (e.g., DN 200)
  • PN 16: Up to 16 bar (230 psi) for medium-sized valves (e.g., DN 50–150)
  • PN 25/40: Available for high-pressure applications in specialized designs

  Note: Ratings are based on ambient temperature (20°C). Higher media temperatures reduce allowable pressure (derating applies).

• Temperature Range

  Operating temperature depends heavily on seat material:

  • NBR: -10°C to +80°C (14°F to 176°F)
  • EPDM: -20°C to +120°C (-4°F to 248°F)
  • Viton: -20°C to +200°C (-4°F to 392°F)
  • PTFE: -200°C to +260°C (-328°F to 500°F)

  Body material also affects thermal limits—stainless steel extends performance in high-temp environments.

Installation Guidelines

Proper installation is crucial for optimal performance and longevity of EN 558-1/13 butterfly valves. Follow these best practices:

• Ensure the valve is installed with the centerline aligned with the pipeline to prevent stress and leakage.
• Install the valve in the closed position to protect the seat during assembly and ensure proper alignment.
• Verify that the valve size (DN) matches the pipe diameter exactly to avoid turbulence and pressure loss.
• Use appropriate gaskets and flange bolts tightened in a crisscross pattern to ensure even compression.
• For wafer-type valves, ensure sufficient space between flanges to accommodate the valve body.
• Position the actuator for easy access and maintenance, avoiding obstructions.

Tip: Always refer to the manufacturer’s installation manual and comply with local piping codes.

Maintenance & Service Life

EN 558-1/13 butterfly valves are known for their long service life and low maintenance requirements, but periodic inspection ensures continued reliability.

• Seat Inspection: Check for wear, cracking, or deformation—especially in high-cycle or abrasive service. Replace if leakage occurs.
• Corrosion Monitoring: Inspect body and disc for signs of pitting or erosion, particularly in marine or chemical environments.
• Lubrication: Apply manufacturer-recommended lubricant to the stem and actuator mechanism (if applicable) to prevent seizing.
• Operational Testing: Perform regular open/close cycles to verify smooth operation and correct actuator function.
• Sealing Integrity: Conduct leakage tests (e.g., bubble test or pressure decay) during scheduled maintenance.

Best Practice: Keep spare seats and seals on hand for quick replacement, minimizing downtime.

Professional Recommendation: When selecting an EN 558-1/13 butterfly valve, prioritize material compatibility with the process media. For example, use EPDM seats in hot water systems, Viton in chemical plants, and aluminum bronze discs in seawater applications. Always confirm the valve’s PN rating and temperature limits against your system’s operating conditions. For critical applications, consider valves with ISO 5208 leakage class A or B for zero visible leakage.

Additional Considerations

• Actuation Options: Manual (lever/handwheel), pneumatic, electric, or hydraulic actuators can be integrated based on control needs.
• End Connections: Wafer, lug, or flanged types—choose based on system design and maintenance access.
• Fire-Safe Design: Some valves are certified to API 607/6FA for fire safety in hydrocarbon applications.
• Coatings: Epoxy or FBE coatings enhance corrosion protection in buried or outdoor installations.
• Standards Compliance: Ensure valves meet additional standards like ISO 10631, API 609, or AWWA for specific industry use.

How to Choose the Butterfly Valve EN 558-1 13 Series: A Comprehensive Guide

Selecting the appropriate butterfly valve enclosure is crucial for ensuring reliable flow control, system safety, and long-term durability. The EN 558-1 13 series refers to standardized face-to-face dimensions for industrial valves, particularly butterfly valves, ensuring interchangeability and compatibility across systems. This guide will walk you through the essential factors to consider when choosing a butterfly valve that meets your operational requirements, complies with industry standards, and delivers optimal performance.

Important Note: Always verify that the butterfly valve not only meets EN 558-1 dimensional standards but also aligns with pressure, temperature, material, and sealing requirements for your specific application. Dimensional compliance does not guarantee functional suitability.

Key Selection Criteria for EN 558-1 13 Series Butterfly Valves

• Application Requirements

  The intended use of the valve is the primary driver in selection. Different types of butterfly valves are engineered for varying service conditions:

  • Resilient-seated butterfly valves are ideal for low to moderate pressure and temperature applications involving water, air, or non-aggressive fluids. They offer excellent sealing and are cost-effective for general-purpose flow control.
  • Double-offset (high-performance) butterfly valves reduce seat wear and improve sealing by offsetting the stem from the disc centerline. Suitable for higher temperatures and moderate cycling applications such as HVAC, irrigation, and process water systems.
  • Triple-offset butterfly valves feature a conical sealing design with zero friction during operation, making them ideal for high-pressure, high-temperature, or corrosive environments like power plants, chemical processing, and oil & gas pipelines.
• Medium Compatibility

  The nature of the fluid or gas passing through the valve directly impacts material selection. Ensuring chemical compatibility prevents corrosion, leaks, and premature failure:

  • For corrosive media (acids, alkalis, saltwater), select valves constructed from stainless steel (e.g., SS304, SS316), duplex alloys, or lined with corrosion-resistant materials like PTFE or EPDM.
  • For non-corrosive liquids and gases (potable water, air, steam), cast iron or carbon steel bodies with appropriate seat materials (e.g., NBR, EPDM) are typically sufficient and more economical.
  • Always consult chemical compatibility charts and consider factors like pH, concentration, and suspended solids when evaluating material suitability.
• Valve Size and Pressure Rating

  Proper sizing and pressure rating are critical for system integrity and performance:

  • The valve's nominal diameter (DN) must match the piping system’s internal diameter to avoid flow restrictions or turbulence. The EN 558-1 13 series defines standardized end-to-end dimensions, ensuring drop-in replacement capability.
  • The valve’s pressure rating (PN or Class) must equal or exceed the maximum operating pressure of the system. Common ratings include PN10, PN16, Class 150, and Class 300.
  • Consider both static and dynamic pressure conditions, including potential water hammer effects, especially in large-diameter lines.
• Standards and Certifications

  Compliance with international standards ensures quality, safety, and interchangeability:

  • The EN 558-1 standard specifies face-to-face dimensions for butterfly valves, ensuring compatibility with piping systems across Europe and many global markets. Series 13 refers to a specific dimensional table within this standard.
  • Look for additional certifications such as ISO 5208 (leakage classification), API 609 (butterfly valve standard), ASME B16.10 (dimensional standards), and CE Marking for pressure equipment directive compliance.
  • For critical applications, valves should have traceable documentation (e.g., Material Test Reports - MTRs) and third-party inspection certifications (e.g., DNV, Lloyd’s Register).
• Maintenance and Service Life

  Choosing low-maintenance designs reduces downtime and lifecycle costs:

  • Valves with PTFE (Teflon) seats offer excellent chemical resistance and low friction, reducing wear and extending service intervals.
  • Stainless steel stems and discs resist pitting and erosion, especially in abrasive or high-velocity flows.
  • Coated carbon steel bodies (e.g., with epoxy or fusion-bonded epoxy) enhance corrosion resistance in outdoor or humid environments.
  • Consider top-entry or inline repairable designs that allow internal component replacement without removing the valve from the pipeline, minimizing maintenance time.

Expert Tip: When specifying butterfly valves, always request a detailed datasheet from the manufacturer that includes materials of construction, pressure-temperature ratings, actuator compatibility, and test certificates. This ensures full transparency and supports informed decision-making.

Additional Considerations

• Actuation Method: Determine whether manual (lever, gear), electric, pneumatic, or hydraulic actuation is required based on frequency of operation and automation needs.
• End Connections: Ensure compatibility with existing piping—common types include wafer, lug, and flanged ends. The EN 558-1 standard applies to all, but sealing methods vary.
• Temperature Range: Verify that the valve’s materials and seals can withstand both minimum and maximum operating temperatures.
• Fire Safety: In hydrocarbon applications, consider fire-safe certified valves (per API 607/6FA) that maintain sealing integrity during fire exposure.
• Environmental Conditions: Outdoor installations may require UV-resistant coatings, anti-vandal features, or freeze protection.

Choosing the right EN 558-1 13 series butterfly valve involves more than just matching dimensions. It requires a holistic evaluation of the application, media, system parameters, and long-term operational goals. By carefully assessing each factor outlined in this guide, engineers and procurement professionals can select a valve that ensures safety, reliability, and cost-effective performance throughout its service life. When in doubt, consult with a qualified valve supplier or engineer to validate your selection.

Frequently Asked Questions About Butterfly Valves

A butterfly valve is a quarter-turn rotational valve designed to quickly start, regulate, or stop the flow of fluid in a piping system. Its primary function is to provide reliable flow control for both on/off and throttling applications.

• Operation: The valve uses a disc mounted on a rotating shaft. When the handle or actuator is turned 90 degrees, the disc moves from a fully open position (parallel to flow) to a fully closed position (perpendicular to flow).
• Applications: Commonly used with liquids (both thin and viscous), gases, and even slurries in industries such as water treatment, chemical processing, HVAC, and oil & gas.
• Advantages: Compact design, lightweight, low pressure drop, and cost-effective compared to other valve types like gate or globe valves.

Due to their simple mechanism and fast operation, butterfly valves are ideal for systems requiring rapid flow interruption or frequent cycling.

The triple-offset butterfly valve (also known as a triple-eccentric valve) is engineered for high-performance sealing and durability in demanding industrial environments.

• Three Offsets Explained:
  1. First Offset: The stem is positioned behind the disc centerline, reducing wear during opening/closing.
  2. Second Offset: The stem is offset horizontally from the pipe centerline, allowing the disc to rotate without rubbing against the seat.
  3. Third Offset: The conical sealing surface is angled so that the disc lifts off the seat immediately upon rotation, eliminating friction.
• Sealing Mechanism: Unlike standard butterfly valves that rely on continuous contact, the triple-offset design achieves a true metal-to-metal seal only when fully closed, resulting in zero leakage and extended service life.
• Use Cases: Ideal for high-temperature, high-pressure, or corrosive applications such as power plants, refineries, and offshore platforms.

This advanced design minimizes wear, allows for bubble-tight shutoff, and supports bi-directional flow—making it superior to double- or zero-offset valves in critical systems.

Yes, butterfly valves are highly efficient for flow control, offering several performance and economic benefits:

• Quick Operation: Requires only a 90-degree turn to go from fully open to fully closed, enabling fast response times in dynamic systems.
• Low Torque Requirement: Especially in double- and triple-offset designs, minimal force is needed to operate the valve, reducing actuator size and energy consumption.
• Minimal Pressure Drop: The streamlined disc creates less resistance to flow compared to other valve types, improving system efficiency.
• Compact & Lightweight: Takes up less space and requires less support structure, making installation easier and less costly.
• Cost-Effective: Lower material and maintenance costs over time, particularly in large-diameter pipelines where gate or ball valves would be prohibitively expensive.

While not ideal for precise throttling at low flow rates, butterfly valves excel in applications requiring reliable, energy-efficient flow regulation with minimal maintenance.

Butterfly valves are constructed from a variety of materials to suit different media, temperatures, pressures, and environmental conditions:

Material selection is critical for long-term reliability. For example, PVC butterfly valves are excellent for acidic solutions in wastewater treatment, while high-grade stainless steel or alloy valves are used in pharmaceutical and petrochemical industries. Always match valve materials to your system’s operating conditions to ensure safety and performance.