The single flange wafer butterfly valve is designed for large diameter pipelines where a standard wafer valve would be difficult to align and a double flange valve would require more face-to-face space. The body includes a flange section that provides a positive bolted connection, while the remaining body profile follows the compact wafer concept.
This configuration is particularly useful at pump outlets, tank connections, and maintenance isolation points. The integral flange can be bolted directly to the adjacent equipment or piping, while the wafer side remains suitable for clamping into the connecting flange joint.
| Design Characteristic | Benefit |
|---|---|
| Integral flange section | Provides positive bolted connection and improves alignment at large diameters. |
| Wafer face-to-face dimension | Maintains a compact installed length comparable to a standard wafer valve. |
| Dead-end isolation capable | Can be bolted directly to a pump outlet, tank nozzle, or downstream piping. |
| Large diameter support | Stronger body construction than a conventional wafer valve in DN700 to DN1200 service. |
| Reduced installation risk | Positive bolting reduces reliance on flange clamping alone for body retention. |
Short wafer-style profile with an integral flange for large water and industrial pipelines.
ASTM A536 body with internal and external epoxy coating for long service life.
EPDM or NBR seat provides bubble-tight bidirectional shutoff in waterworks service.
Large-diameter torque reduction with self-locking operation and mechanical position indication.
Compatible with electric, hydraulic, and pneumatic actuation for remote control.
The following specification overview is based on the standard large-diameter single flange wafer configuration. Final dimensions, flange drilling, pressure class, and materials must be confirmed by the Laux Valve engineering team.
| Parameter | Specification |
|---|---|
| Connection Type | Single Flange Wafer |
| Size Range | DN700 to DN1200 / 28 inch to 48 inch |
| Design Standard | EN 593 / API 609 / EN 558 |
| Body Material | Ductile Iron ASTM A536 Grade 65-45-12 |
| Disc Material | Ductile Iron / optional stainless steel |
| Seat | EPDM / NBR resilient seat |
| Shaft | SS416 / SS431 / SS316 / 17-4PH |
| Pressure Rating | PN10 / PN16 / Class 125 / Class 150 |
| Flange Drilling | EN 1092-2 / ASME B16.1 compatible |
| Face-to-Face | Wafer short pattern / EN 558, confirm for selected size |
| Body Coating | Fusion-bonded epoxy, internal and external |
| Seat Leakage | Bubble-tight, bidirectional |
| Test Standard | API 598 / EN 12266-1 |
| Operation | Worm gear / electric / hydraulic / pneumatic |
| Actuator Mounting | ISO 5211 top flange |
| Connection | Standard Wafer | Single Flange Wafer | Double Flange |
|---|---|---|---|
| Face-to-face length | Short | Same as wafer | Longer |
| Positive bolted connection | No, clamped between flanges | Yes, integral flange section | Yes, both ends |
| Dead-end isolation | Not recommended | Yes, at the flange end | Yes |
| Large-diameter structural support | Lower | Improved | Highest |
| Best fit | Standard continuous pipelines | Large pipelines, pump outlets, maintenance points | Critical isolation and buried service |
| Actuator | Typical Use |
|---|---|
| Worm Gearbox | Standard manual operation for large-diameter valves with high torque |
| Electric Actuator | Remote or automated on-off and modulating control |
| Hydraulic Cylinder | High-torque operation for waterworks and pump station applications |
| Pneumatic Actuator | Fast automated isolation where compressed air is available |
Standard testing items may include:
It is a large diameter butterfly valve that combines a wafer-style compact body with an integral flange section. The flange provides positive bolted connection, alignment, and dead-end isolation capability while retaining the short face-to-face length of a wafer valve.
The single flange wafer butterfly valve is commonly supplied in DN700 to DN1200 (28 inch to 48 inch) sizes. Final size and face-to-face dimension should be confirmed for the project specification.
Yes. The integral flange end allows the valve to be bolted directly to a pump outlet, tank nozzle, or downstream piping for dead-end isolation. The applicable pressure rating and installation direction should be confirmed.
A standard wafer valve is clamped between two pipe flanges. A single flange valve adds an integral flange section for positive bolting, improved alignment, and greater structural support, especially at large diameters.
The standard configuration uses a ductile iron body with epoxy coating, EPDM resilient seat, and stainless steel shaft. NBR seat material and stainless steel or duplex shaft options are available.
Yes. Large diameter single flange wafer butterfly valves are normally supplied with a worm gearbox. Electric, hydraulic, and pneumatic actuators can be factory mounted using the ISO 5211 top flange.
Standard testing includes shell hydrostatic test, bidirectional seat leakage test, dimensional inspection, coating inspection, and an operational open-close cycle test.
Yes. Custom flange drilling, seat and shaft materials, actuator integration, coating, nameplate, and packaging are available.
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
