This WRAS approved lugged and tapped butterfly valve is designed for reliable shut-off and flow control in potable water, HVAC, utility, and industrial pipeline systems. Featuring an epoxy-coated ductile iron body, CF8M stainless steel disc, EPDM resilient liner, and ISO 5211 direct mounting pad, this valve provides dependable sealing performance with excellent corrosion resistance and simplified actuator installation.

Unlike standard wafer butterfly valves, the lugged and tapped body design allows one side of the pipeline to be disconnected while the opposite side remains pressurised, making this valve ideal for maintenance isolation, pump servicing, and dead-end service applications.

Suitable for manual, pneumatic, or electric operation across a wide range of commercial and industrial installations.

Key Features

• WRAS approved for potable water applications
• Lugged & tapped butterfly valve design
• Suitable for dead-end service applications
• Epoxy-coated EN GJS 400-15 ductile iron body
• CF8M stainless steel disc
• EPDM resilient liner
• ISO 5211 direct mounting interface
• PTFE bushings for reduced friction
• Viton O-ring sealing
• Quarter-turn operation
• Lever operated sizes 1”–10”
• Gearbox operated sizes 12”–24”
• PN16 pressure rating up to 16”
• PED 97/23/CE compliant

Why Choose a Lugged & Tapped WRAS Butterfly Valve?

Improved Maintenance Flexibility

Lugged and tapped butterfly valves allow downstream pipework or equipment to be removed while maintaining isolation on the upstream side of the valve. This makes them ideal for systems requiring easier maintenance access and improved serviceability.

Suitable for Dead-End Service

Unlike many wafer-pattern butterfly valves, the lugged and tapped body design allows one side of the pipeline to be disconnected while maintaining isolation on the opposite side of the valve.

This makes lugged butterfly valves particularly useful for:

• tank outlets,
• filtration systems,
• process skids,
• dosing systems,
• loading lines,
• pump isolation,
• and maintenance-intensive pipework.

In many industrial installations, lugged butterfly valves are selected as a lighter and more space-efficient alternative to flanged ball valves while still providing reliable isolation and easier downstream equipment removal.

Their compact quarter-turn design also makes them well suited to:

• large diameter pipework,
• elevated pipe systems,
• modular process plants,
• and applications where actuator automation may be required.

Compact Space-Saving Design

Butterfly valves provide reliable quarter-turn isolation while maintaining a lightweight and compact installation footprint compared with larger gate valve alternatives.

Easy Automation

The ISO 5211 mounting pad allows direct installation of pneumatic or electric actuators without complicated brackets or modification kits.

Corrosion Resistant Industrial Construction

Ductile Iron Body

The epoxy-coated EN GJS 400-15 ductile iron body provides excellent mechanical strength, durability, and corrosion resistance for commercial and industrial pipe systems.

CF8M Stainless Steel Disc

The CF8M stainless steel disc offers excellent corrosion resistance and is equivalent to cast 316 stainless steel, making it suitable for water, HVAC, and general industrial service.

EPDM Resilient Liner

The EPDM liner provides reliable sealing performance with low operating torque, particularly in potable water and HVAC applications.

PTFE Bushings & Viton O-Rings

PTFE bushings help reduce operating friction and stem wear, while Viton O-rings improve sealing reliability and temperature resistance.

Typical Applications

Suitable for:

• Potable water systems
• HVAC systems
• Chilled water pipework
• Cooling water systems
• Water treatment plants
• Irrigation systems
• Commercial building services
• Utility services
• Pump isolation systems
• General industrial pipeline applications

ISO 5211 Butterfly Valve for Easy Automation

This lugged butterfly valve features an ISO 5211 direct mounting pad, allowing simple installation of pneumatic or electric actuators for automated flow control and isolation applications.
The standardised mounting interface helps reduce installation time while simplifying future maintenance and actuator replacement.

Compatible with:

• Pneumatic actuators
• Electric actuators
• Manual gearboxes
• Quarter-turn automation systems

Pressure & Temperature Performance

This butterfly valve is rated:

• PN16 from 1” to 16”
• PN10 from 18” to 24”
• Temperature range: -10°C to +120°C (130°C peak)

The pressure/temperature relationship is influenced primarily by the EPDM liner material, with allowable pressure reducing at elevated temperatures.

Always confirm suitability against actual operating conditions, media compatibility, and pressure requirements.

Operating Torque Information

Operating torque values are provided to assist with:

• Pneumatic actuator sizing
• Electric actuator selection
• Gearbox specification
• Manual operation assessment

As differential pressure increases, operating torque also increases due to higher seat loading and disc friction forces.

Torque values shown are approximate. A suitable safety factor should be applied when sizing pneumatic or electric actuators to allow for service conditions, pressure variations, and operational wear.

Flow Characteristics & Head Loss

Butterfly valves provide excellent compact isolation performance while maintaining relatively low pressure drop characteristics when fully open.

The supplied Kv values, head loss chart, and flow/opening position data assist with:

• Valve sizing
• Flow balancing
• Pressure drop calculations
• HVAC regulation
• Water system performance analysis

Because butterfly valves are non-linear flow devices, flow rate increases significantly at higher opening angles.

Flange Compatibility & Installation

This lugged and tapped butterfly valve is designed for compatibility with common industrial flange standards including:

• PN10
• PN16

The threaded lug body design helps simplify installation while improving flange connection flexibility.

Technical Specifications

Why Engineers Choose Lugged Butterfly Valves

Engineers commonly select lugged and tapped butterfly valves where:

• maintenance flexibility is important,
• downstream equipment removal may be required,
• actuator automation is planned,
• compact installation space is limited,
• and reliable resilient seated isolation is needed.

Unlike standard wafer butterfly valves, the lugged and tapped body design allows one side of the pipeline to be disconnected while maintaining isolation on the opposite side of the valve. This makes lugged butterfly valves particularly suitable for:

• tank outlets,
• filtration systems,
• process skids,
• loading lines,
• pump isolation,
• and maintenance-intensive industrial pipework.

In many commercial and industrial systems, lugged butterfly valves are selected as a lighter and more compact alternative to fully flanged ball valves, particularly on larger pipe sizes where installation weight, actuator torque, and pipe support loading become more significant.

The combination of:

• dead-end service capability,
• corrosion-resistant construction,
• ISO 5211 actuator compatibility,
• WRAS approval,
• and quarter-turn operation

makes this valve suitable for a wide range of demanding water, HVAC, utility, and industrial process applications.

Frequently Asked Questions

1. What is a lugged butterfly valve?
   • A lugged butterfly valve uses threaded lug holes within the valve body, allowing the valve to be bolted directly between pipe flanges.
2. Can this valve be used for dead-end service?
   • Yes. Lugged and tapped butterfly valves are commonly used where one side of the pipeline may need to be disconnected during maintenance.
3. Is this butterfly valve WRAS approved?
   • Yes. This valve is WRAS approved for potable water applications.
4. Can pneumatic actuators be fitted?
   • Yes. The ISO 5211 mounting pad allows direct installation of pneumatic or electric actuators.
5. What pressure is this valve rated for?
   • The valve is rated PN16 up to 16” and PN10 for sizes from 18” to 24”.
6. What temperature range is this valve suitable for?
   • This valve is suitable for temperatures from -10°C to +120°C, with 130°C peak temperature capability.
7. What is the difference between wafer and lugged butterfly valves?
   • Lugged butterfly valves use threaded body lugs that allow one side of the pipework to be disconnected while maintaining isolation, making them suitable for dead-end service applications.

This WRAS Approved Wafer Butterfly Valve is designed for reliable shut-off and flow control in potable water, HVAC, cooling water, and general industrial pipeline systems. Manufactured with an epoxy-coated ductile iron body, 316 stainless steel disc, and resilient EPDM liner, this valve offers dependable sealing performance, excellent corrosion resistance, and long operational life.

Its compact wafer-pattern design allows installation between standard pipe flanges while reducing overall system weight and installation space requirements compared with traditional gate valve assemblies.

Designed with an ISO 5211 mounting pad, this butterfly valve is suitable for manual lever operation, gearbox operation, or future automation using pneumatic or electric actuators.

Suitable for commercial and industrial applications requiring reliable quarter-turn isolation and low maintenance operation.

Why Choose This Ductile Iron Wafer Butterfly Valve?

Corrosion Resistant Construction

The epoxy-coated ductile iron body helps protect against external corrosion and environmental exposure, while the 316 stainless steel disc provides improved resistance to corrosion and wear in water and utility service applications.

Reliable EPDM Sealing Performance

The resilient EPDM liner provides dependable shut-off performance with low operating torque, making this valve ideal for frequent operation in water, chilled water, and HVAC systems.

Compact Wafer Butterfly Valve Design

The wafer-pattern body design reduces installation weight and space requirements, making it ideal for compact plant rooms, utility systems, and commercial pipework installations.

Easy Actuator Installation

The integrated ISO 5211 mounting interface allows direct mounting of pneumatic or electric actuators without complicated brackets or modifications.

Low Maintenance Quarter-Turn Operation

Butterfly valves provide simple and efficient 90° quarter-turn operation with fewer moving parts than many traditional valve types, helping reduce maintenance requirements.

Common Applications

This WRAS Approved Butterfly Valve is suitable for:

• Potable water systems
• HVAC systems
• Chilled water pipework
• Cooling water systems
• Water treatment plants
• Irrigation systems
• Commercial building services
• Utility services
• General industrial pipework

ISO 5211 Butterfly Valve for Easy Automation

This valve features an ISO 5211 direct mounting pad, allowing fast and simple installation of pneumatic or electric actuators. This standardised mounting arrangement helps reduce installation time while simplifying future maintenance and automation upgrades.

For customers planning future system automation, the ISO 5211 interface provides compatibility with a wide range of industrial actuators.

Technical Specification Overview – WRAS Approved Butterfly Valve

Material Specifications

Industrial-Grade Materials for Reliable Long-Term Performance

This WRAS Approved Wafer Butterfly Valve is manufactured using carefully selected materials to provide dependable sealing performance, corrosion resistance, and durability across water, HVAC, and industrial pipeline applications.

Material Highlights

• EN GJS 400-15 Ductile Iron Body provides excellent mechanical strength and durability for commercial and industrial pipe systems.
• CF8M Stainless Steel Disc offers strong corrosion resistance and is equivalent to marine-grade 316 stainless steel.
• EPDM Liner delivers reliable sealing performance in potable water and HVAC applications.
• PTFE Bushings help reduce friction and operating torque during valve operation.
• AISI 420 Stainless Steel Stem provides good strength and wear resistance for repeated operation cycles.
• Viton O-rings improve sealing reliability and temperature resistance.

Material specifications may vary slightly depending on valve size and manufacturer production updates.

Valve Dimensions & Weights

WRAS Approved Wafer Butterfly Valve – Dimensions and Approximate Weights

The table below provides key dimensional and weight information for installation planning, pipework layout, actuator clearance, lifting requirements, and maintenance access.

All dimensions shown in millimetres unless otherwise stated.
Weights are approximate and may vary slightly depending on configuration and actuator selection.

Valve Technical Drawing & Material Specification

The dimensional annotations and numbered component references shown within the drawing correspond directly to the dimension tables and material specification tables above.

For easier viewing of dimensions, materials, and component details, you can open the full technical drawing in a new tab: WRAS Approved Wafer Butterfly Valve Dimensions and Material Specification Drawing

Operating Torque Information

Valve Operating Torque by Differential Pressure

The table below provides approximate operating torque values for the WRAS Approved Wafer Butterfly Valve at different working pressures. These values are important when selecting manual gearboxes, pneumatic actuators, or electric actuators.

Why Operating Torque Matters

Correct operating torque information is essential for:

• Pneumatic actuator sizing
• Electric actuator selection
• Gearbox specification
• Safe manual operation
• Reliable valve performance under pressure

As system pressure increases, the force acting against the valve disc also increases, resulting in higher operating torque requirements.

Torque values shown are approximate and may vary depending on media type, operating frequency, temperature, and service conditions. A suitable safety factor should be applied when sizing pneumatic or electric actuators to allow for service conditions, pressure variations, and operational wear.

Flange Compatibility

Suitable for Multiple International Flange Standards

This wafer butterfly valve is designed for compatibility with a wide range of common flange standards used across commercial, industrial, HVAC, and water treatment systems.

Imperial Size	DN Size	PN6	PN10	PN16	ANSI 150	Table D	Table E
1” & 1¼”	DN25 & DN32
1½” & 2”	DN40 & DN50
2½”	DN65
3” to 14”	DN80 to DN350
16”	DN400
18” to 24”*	DN450 to DN600

* PN10 or PN16 must be selected at time of order.

Pressure, Temperature & Flow Performance

Engineered for Reliable Flow Control Performance

The charts below provide additional operating performance data for the WRAS Approved Wafer Butterfly Valve, including pressure/temperature limits, head loss characteristics, and flow rate behaviour relative to valve opening position.

These performance charts are useful when sizing valves, assessing pressure drop within a pipeline system, selecting actuators, and evaluating flow control characteristics in water and HVAC applications.

Pressure / Temperature Performance

The pressure and temperature chart illustrates the allowable operating pressure relative to fluid temperature for this resilient seated butterfly valve design.

Key considerations:

• Maximum pressure rating up to PN16
• Temperature range suitable for water and HVAC systems
• EPDM liner operating limitations
• Reduced pressure capability at elevated temperatures

Always verify operating conditions against system design requirements and media compatibility.

Head Loss Characteristics

The head loss chart shows the approximate pressure drop across the valve when fully open under water service conditions.

This information can assist with:

• Pump sizing
• System efficiency calculations
• Pipeline pressure drop analysis
• Flow optimisation

Lower head loss generally improves overall system efficiency and reduces pumping energy requirements.

Flow Rate vs Opening Position

The flow rate/opening position chart demonstrates how valve opening angle affects relative flow capacity under constant head conditions.

Butterfly valves are commonly used for:

• Isolation duties
• Basic throttling applications
• Flow balancing
• HVAC regulation systems

The chart also illustrates the valve’s lower and upper regulation zones for improved flow control understanding.

Why Engineers Specify This WRAS Approved Wafer Butterfly Valve

Engineers and contractors commonly select resilient seated butterfly valves where compact installation, reliable shut-off, and low operating torque are important.

The combination of:

• ductile iron body strength,
• 316 stainless corrosion resistance,
• EPDM resilient sealing,
• and ISO 5211 actuator compatibility

makes this valve suitable for a wide range of commercial and industrial pipeline systems.

The wafer body style also reduces overall installation weight compared with fully flanged valve alternatives, helping simplify handling and installation on larger pipe sizes.

Frequently Asked Questions

What is a wafer butterfly valve used for?

Wafer butterfly valves are commonly used for isolation and flow control in water, HVAC, and industrial pipeline systems where compact installation and quarter-turn operation are required.

Is this butterfly valve WRAS approved?

Yes. This valve is WRAS approved for potable water applications.

Can this butterfly valve be automated?

Yes. The ISO 5211 mounting pad allows installation of pneumatic or electric actuators.

What pressure is this butterfly valve rated for?

The valve is rated PN16 up to 16” and PN10 for sizes from 18” to 24”.

What temperature range is this valve suitable for?

This valve is suitable for temperatures from -10°C to +120°C.

The Kingdom EN PN10–PN40 Direct Mount range is built for exactly that. It’s a full-port, 2-piece, flanged ball valve series covering PN10, PN16, PN25, and PN40, with a built-in ISO 5211 direct mounting pad for clean actuator installation (or simple future upgrades from manual to actuated).

Model options (quick selector)

Choose standard or fire-safe, then select the PN rating code:

• Standard type (KV-L4*): KV-L4J (PN10) / KV-L4K (PN16) / KV-L4M (PN25) / KV-L4N (PN40)
• Fire-safe type (KV-L6*): KV-L6J (PN10) / KV-L6K (PN16) / KV-L6M (PN25) / KV-L6N (PN40)

(Code guide: J=PN10, K=PN16, M=PN25, N=PN40.)

Why teams choose direct-mount ball valves

If you’ve ever lost time fighting actuator alignment, couplers, or “it fits but it binds,” you already know the value of a clean mounting interface. Kingdom specifies a built-in ISO 5211 mounting pad, which is designed to reduce extra mounting hardware and make automation packages more straightforward. For maintenance managers, that typically means: cleaner shutdown workpacks (fewer bits and pieces), quicker actuator swaps, less risk of misalignment-driven torque and sticking issues.

Key features (translated into real-world value)

Full port (full bore) helps avoid turning a line into its own restriction. It’s the simplest way to reduce the risk of post-change complaints about flow and pressure drop.

Anti-static device (ball–stem–body) supports electrical continuity — a common requirement in certain hazardous-area or hydrocarbon duties.

Blow-out proof stem is a safety-minded design detail that helps reduce severity in abnormal pressure scenarios and supports safer maintenance culture.

Pressure balance hole in the ball slot is listed to help manage pressure effects at the ball/seat interface, which can support smoother operation and reduce “stiff valve” callouts in some services.

TA-Luft / ISO 15848-1 design approval is relevant for sites focused on leak reduction and fugitive emissions expectations — fewer persistent weeps means fewer repeat work orders.

NACE MR0175 / MR0103 optional is there for when your service conditions demand it (e.g., sour duties). It provides a route to specify materials correctly rather than “best guessing” and paying for it later.

Fire-safe option (KV-L6*)

Where your site standards call for fire-safe isolation, the KV-L6* models are specified as Fire Safe design approved, with fire test references API 607 (5th edition) and ISO 10497.

That’s useful when you need the spec to stand up to engineering review, insurer expectations, or safety-case documentation — without switching to a completely different valve family.

Standards (plain-English “what this means”)

Kingdom references common EN standards to reduce uncertainty when replacing or documenting valves:

• EN 1092-1 (Flanges) — matches EN flange drilling/dimensions across PN10–PN40.
• EN 558 (Face-to-face) — standard end-to-end lengths to help replacements fit without pipework modifications.
• EN 12516-1 (Design) — design rules for pressure/temperature integrity.
• EN 12266-1 (Testing) — inspection and pressure testing expectations.
• ISO 5211 (Mounting) — the actuator mounting interface used for direct-mount automation.

Documentation: Datasheets, Instruction Manuals & Certification

• Instruction manual
• Datasheet 1
• Datasheet 2
• Kingdom KV-L Series Certificates (PDF)

Operation & quotation (so we can price it quickly)

Kingdom lists operation by size: lever DN15–DN65, gear option DN65–DN200, and pipe handle DN80–DN200.

To quote accurately, send:
DN size + PN rating (10/16/25/40) + standard or fire-safe + body material + seat selection + media + temperature + manual/actuated (and any limit switch/positioner needs).

Send your enquiry and we’ll confirm the correct model code and a suitable configuration for your service.

The Kingdom KV-L Series is designed for exactly that reality: a flanged, full-port, 2-piece ball valve range for ASME Class 150 / 300 services, built around proven industry standards and practical maintenance features.

What’s in the KV-L range?

This product listing covers the four related models below:

• KV-L41 — Class 150, ISO 5211 direct mount, standard design
• KV-L42 — Class 300, ISO 5211 direct mount, standard design
• KV-L61 — Class 150, ISO 5211 direct mount, fire-safe design (fire-safe type)
• KV-L62 — Class 300, ISO 5211 direct mount, fire-safe design (fire-safe type)

In other words: pick pressure class first, then decide whether you need standard or fire-safe. (Fire safe is recommended and the most common type we sell.)

Core design features (what your team actually benefits from)

ISO 5211 direct mounting pad (built-in)

This is one of the biggest “time savers” in the real world: the valve is designed for direct actuator mounting without extra bracketry. That generally means faster installs, fewer alignment issues, and cleaner automation packages.

Full port (full bore) flow path

Full port valves reduce restriction through the valve, supporting flow efficiency and making life easier where pressure drop matters. It can also be helpful where pigging or cleaning routines benefit from a clear bore.

Fire-safe design available (KV-L61 / KV-L62)

Where site standards or risk assessments call for it, the fire-safe models are designed to meet fire-test expectations (see the standards section below). Fire-safe design is about maintaining a degree of shut-off integrity after exposure to fire conditions, using appropriate secondary sealing strategies.

Anti-static devices (ball–stem–body)

Anti-static design helps control static charge build-up during operation — a practical requirement in many hydrocarbon / hazardous area contexts.

Blow-out proof stem

A blow-out proof stem is a safety-minded design choice that helps prevent stem ejection under abnormal conditions, supporting safer maintenance and operation.

Pressure balance hole in ball slot

A pressure balance feature helps manage pressure effects around the ball/seat area, supporting consistent operation and helping reduce the chance of “sticky” operation in certain services.

Materials and seats to suit common industrial duties

The datasheet shows common body materials including WCB and CF8M, and common seat materials including PTFE / TFM1600 / TFM4215 (configuration dependent). This is why we quote the valve correctly for your media, temperature, and duty rather than guessing from a generic listing.

Standards (brief, plain-English guide)

The KV-L Series references widely used valve standards, which matters because it reduces ambiguity when you’re specifying replacements or documenting compliance:

• ASME B16.34 (Design): core pressure/temperature design rules for valves.
• ASME B16.10 (Face-to-Face): standardised end-to-end dimensions to aid replacement fit.
• ASME B16.5 (Flanges): flange dimensions/ratings for Class 150/300 pipework compatibility.
• API 598 (Inspection & testing): pressure test expectations for production valve testing.
• API 607 / ISO 10497 (Fire testing): fire-test standards (relevant to fire-safe models).
• ISO 5211 (Actuator mounting): direct mounting interface for automation packages.
• ISO 15848-1 / TA-Luft (Fugitive emissions): leakage control expectations (important for emissions-sensitive sites).
• NACE MR0175 / MR0103 (Optional): guidance for sour service/material suitability where required.

Documentation: Datasheets, Instruction Manuals & Certification

• Instruction manual
• Datasheet 1
• Datasheet 2
• Kingdom KV-L Series Certificates (PDF)

Quotation and supply

For now, this is a model-level listing (one product page for the range). We’ll confirm:

• Size (NPS), pressure class (150/300), body/trim materials
• Seat and packing selection for your duty (temperature/media)
• Manual lever, gear operator, or full automation package (actuator + accessories)

Request a quotation and we’ll come back with the best-fit configuration and lead time.