WRAS Approved Wafer Butterfly Valve for Water & HVAC Systems
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
| Specification | Details |
|---|---|
| Valve Type | Wafer Butterfly Valve |
| Body Material | Epoxy Coated Ductile Iron |
| Disc Material | 316 Stainless Steel |
| Seat / Liner Material | EPDM |
| Pressure Rating | PN16 up to 16”, PN10 from 18”–24” |
| Temperature Range | -10°C to +120°C (130°C peak) |
| Mounting Standard | ISO 5211 |
| Operation | Lever / Gearbox |
| Approval | WRAS Approved |
| Compliance | PED 97/23/CE |
| Connection Type | Wafer Pattern |
| Sizes Available | 1.5”–16” / DN40 – DN400 (If you require WRAS approved below or above this size, please get in touch) |
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.
| Item | Component | Material Specification |
|---|---|---|
| 1 | Body | EN GJS 400-15 Ductile Iron |
| 2 | Disc | CF8M Stainless Steel |
| 3 | Stem | AISI 420 Stainless Steel |
| 4 | Liner | EPDM |
| 5 | Bushing | PTFE |
| 6 | Washer | Galvanised Carbon Steel |
| 7 | Circlip | Spring Steel |
| 8 | O-ring | Viton |
| 9 | Lever (1”–6”) | Aluminium |
| 9 | Lever (8” & 10”) | EN GJS 400-15 Ductile Iron |
| 10 | Bolts | Galvanised Carbon Steel |
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.
| Imperial Size | DN Size | A | B | ØC | D | F1 | R | ØY | Z | Weight with Lever (kg) | Weight with Gearbox (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1” | DN25 | 33 | 51 | 65 | 104 | 192 | – | – | 68 | 1.7 | 5.7 |
| 1¼” | DN32 | 33 | 56 | 73 | 110 | 192 | 1 | 12 | 68 | 1.7 | 5.7 |
| 1½” | DN40 | 33 | 63 | 82 | 116 | 170 | 5 | 27 | 50 | 1.8 | 5.8 |
| 2” | DN50 | 43 | 62 | 89 | 126 | 170 | 5 | 31 | 50 | 2.1 | 6.1 |
| 2½” | DN65 | 46 | 69 | 102 | 136 | 170 | 9 | 45 | 50 | 2.4 | 6.4 |
| 3” | DN80 | 46 | 90 | 118 | 150 | 206 | 17 | 65 | 69 | 3.2 | 7.0 |
| 4” | DN100 | 52 | 106 | 150 | 170 | 206 | 26 | 90 | 69 | 4.3 | 8.1 |
| 5” | DN125 | 56 | 119 | 174 | 180 | 285 | 34 | 110 | 90 | 6.3 | 9.6 |
| 6” | DN150 | 56 | 131 | 205 | 200 | 285 | 50 | 146 | 90 | 7.8 | 11.1 |
| 8” | DN200 | 60 | 166 | 260 | 230 | 400 | 71 | 194 | 72 | 15.0 | 22.3 |
| 10” | DN250 | 68 | 202 | 318 | 266 | 530 | 91 | 241 | 72 | 23.5 | 32.8 |
| 12” | DN300 | 78 | 235 | 376 | 292 | 530 | 112 | 291 | 72 | – | 42.0 |
| 14” | DN350 | 78 | 257 | 406 | 335 | – | 128 | 324 | – | – | 43.0 |
| 16” | DN400 | 102 | 292 | 471 | 360 | – | 144 | 379 | – | – | 60.0 |
| 18” | DN450 | 114 | 318 | 539 | 422 | – | 163 | 428 | – | – | 107.7 |
| 20” | DN500 | 127 | 355 | 594 | 480 | – | 182 | 475 | – | – | 155.8 |
| 24” | DN600 | 154 | 444 | 695 | 562 | – | 219 | 573 | – | – | 231.1 |
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.
| Imperial Size | DN Size | 3 Bar (Nm) | 6 Bar (Nm) | 10 Bar (Nm) | 16 Bar (Nm) |
|---|---|---|---|---|---|
| 1” | DN25 | 2.9 | 3.1 | 3.3 | 3.4 |
| 1¼” | DN32 | 4.7 | 5.1 | 5.4 | 5.7 |
| 1½” | DN40 | 7.8 | 8.4 | 8.8 | 9.2 |
| 2” | DN50 | 11.3 | 12.0 | 13.0 | 13.0 |
| 2½” | DN65 | 17.0 | 18.0 | 20.0 | 21.0 |
| 3” | DN80 | 23.0 | 25.0 | 26.0 | 28.0 |
| 4” | DN100 | 33.0 | 36.0 | 40.0 | 44.0 |
| 5” | DN125 | 48.0 | 54.0 | 61.0 | 68.0 |
| 6” | DN150 | 68.0 | 78.0 | 88.0 | 99.0 |
| 8” | DN200 | 120.0 | 134.0 | 148.0 | 162.0 |
| 10” | DN250 | 189.0 | 212.0 | 234.0 | 257.0 |
| 12” | DN300 | 290.0 | 316.0 | 342.0 | 367.0 |
| 14” | DN350 | 298.0 | 347.0 | 396.0 | 550.0 |
| 16” | DN400 | 481.0 | 551.0 | 622.0 | 850.0 |
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.
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