WRAS Approved Lugged & Tapped Butterfly Valve for Water & Industrial Systems
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
| Specification | Details |
| Valve Type | Lugged & Tapped Butterfly Valve |
| Body Material | EN GJS 400-15 Ductile Iron |
| Disc Material | CF8M Stainless Steel |
| Stem Material | AISI 420 Stainless Steel |
| Seat / Liner | EPDM |
| Bushings | PTFE |
| O-Rings | Viton |
| Pressure Rating | PN16 up to 16”, PN10 18”–24” |
| Temperature Range | -10°C to +120°C |
| Mounting Standard | ISO 5211 |
| Operation | Lever / Gearbox |
| Approval | WRAS Approved |
| Compliance | PED 97/23/CE |
| Sizes Available | 1”–24” |
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
- 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.
- 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.
- Is this butterfly valve WRAS approved?
- Yes. This valve is WRAS approved for potable water applications.
- Can pneumatic actuators be fitted?
- Yes. The ISO 5211 mounting pad allows direct installation of pneumatic or electric actuators.
- What pressure is this 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, with 130°C peak temperature capability.
- 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.
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