The 30 inch butterfly valve is commonly specified where large diameter pipelines require dependable isolation, low installed weight, and a short face-to-face length compared with gate valves or plug valves. This DN750 valve combines a double eccentric disc with waterworks-grade materials and testing, making it suitable for water treatment plant isolation, pump station headers, raw water intake, reservoir inlet/outlet, and transmission mains.
The double eccentric geometry uses two shaft offsets. The shaft is positioned behind the sealing plane and slightly off the pipe centerline, so the disc lifts away from the seat shortly after opening begins. This reduces seat rubbing, lowers torque, and helps maintain consistent seat performance over repeated operating cycles.
For drinking water and potable water service, the valve can be supplied with NSF/ANSI 61 certified wetted materials and coatings. NSF/ANSI 61 is the health effects standard for drinking water system components, covering the materials that come into contact with potable water.
Laux Valve can configure the body coating, seat, disc, shaft, and other wetted components with NSF/ANSI 61 certified materials where required by the project. Certification documents are provided according to the selected size and configuration.
| Design Characteristic | Benefit for DN750 Waterworks Service |
|---|---|
| First shaft offset | Positions the shaft behind the sealing plane for an uninterrupted seal profile. |
| Second shaft offset | Creates cam-like disc motion that lifts the disc away from the seat during opening. |
| Reduced seat rubbing | Less continuous disc-to-seat contact compared with a concentric valve. |
| Lower operating torque | Can reduce gear operator and actuator sizing requirements at large diameter. |
| Improved cycling behavior | Supports frequent operation and modulating control better than a standard concentric valve. |
30 inch DN750 flanged body for water mains, pump headers, and treatment plant isolation.
Offset geometry reduces seat contact and operating torque for better large-valve performance.
Ductile iron body with internal and external epoxy coating and stainless steel shaft for long service life.
Direct mounting for gear operators, electric actuators, hydraulic cylinders, or pneumatic actuators.
Available with certified wetted materials and coatings for potable water system compliance.
The following specification overview is based on the AWWA C504 Class 150 short-body waterworks configuration. Final dimensions, pressure class, flange drilling, and material selection must be confirmed by the Laux Valve engineering team.
| Item | Specification |
|---|---|
| Nominal Size | 30 inch / DN750 |
| Valve Design | Double Eccentric |
| Body Style | Double Flange |
| Pressure Class | AWWA C504 Class 150 |
| Face-to-Face | 12 inch |
| Structural Length | 305 mm |
| Flange OD | To be confirmed per ANSI B16.1 Class 125 drilling |
| Bolt Circle | To be confirmed per ANSI B16.1 Class 125 drilling |
| Number of Bolts | To be confirmed per ANSI B16.1 Class 125 drilling |
| Bolt Size | To be confirmed per ANSI B16.1 Class 125 drilling |
| Seat | EPDM-S / EPDM-P |
| Shaft | SS304 / SS316 / 17-4PH |
| Body Coating | Epoxy, internal and external |
| Certification | NSF/ANSI 61 available for wetted materials and coatings |
| Actuation | Manual gear / electric / hydraulic / pneumatic |
| Mounting | ISO 5211 top flange |
| Component | Available Materials |
|---|---|
| Body | Ductile Iron ASTM A536 Grade 65-45-12 |
| Disc | Ductile Iron ASTM A536 Grade 65-45-12 |
| Valve Sealing | EPDM |
| O-Rings | EPDM |
| Shaft | Stainless Steel ASTM A276 Grade 304 / 316 / 17-4PH |
| Shaft Bearing | Lead- and zinc-free bronze |
| Body Seat | High-alloy weld overlay, microfinished |
| Coating | Epoxy, internal and external |
| Actuator | Typical Use |
|---|---|
| Gear Operator | 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 large waterworks valves |
| Pneumatic Actuator | Fast automated isolation where air supply is available |
| Comparison | Concentric AWWA C504 | Double Eccentric AWWA C504-Style |
|---|---|---|
| Shaft position | Through disc and seat centerline | Offset behind sealing plane and pipe centerline |
| Disc-to-seat contact | Continuous during most of the stroke | Mainly near the fully closed position |
| Operating torque | Higher | Lower |
| Seat wear with frequent cycling | Higher | Lower |
| Best fit | Infrequent isolation and cost-sensitive projects | Large sizes, frequent operation, or modulating service |
Standard testing items may include:
Exact test pressures, methods, and acceptance criteria should be confirmed according to AWWA C504 and the project specification.
Laux Valve provides OEM and customized butterfly valve solutions for distributors, EPC contractors, and waterworks equipment manufacturers. Possible customization options include:
It is a large diameter DN750 flanged butterfly valve configured for waterworks service. The double eccentric disc geometry reduces seat contact and operating torque while the valve is supplied with AWWA C504-compatible materials and testing for municipal water applications.
A concentric valve has the shaft through the disc center and continuous disc-to-seat contact. A double eccentric valve offsets the shaft behind the sealing plane and from the pipe centerline, so the disc lifts away from the seat during opening. This reduces seat wear and operating torque.
This datasheet page is configured for AWWA C504 Class 150 short-body service. Final pressure class, face-to-face dimension, and flange drilling must be confirmed for the selected configuration.
Typical waterworks materials include a ductile iron body, ductile iron disc, EPDM-S/EPDM-P valve sealing and O-rings, stainless steel ASTM A276 Grade 304/316/17-4PH shaft, and epoxy coating. Final material selection depends on water quality and project specification.
Yes. Laux Valve can supply the 30 inch waterworks butterfly valve with NSF/ANSI 61 certified wetted materials and coatings for drinking water contact. Certification documentation should be matched to the selected body, seat, disc, shaft, and coating configuration.
Yes. The valve is available with ISO 5211 top flange mounting for gear operators, electric actuators, hydraulic cylinders, or pneumatic actuators. Actuator torque must be confirmed for the 30 inch size and operating conditions.
Typical applications include water treatment plant isolation, pump station headers, transmission mains, raw water intake, reservoir inlet and outlet, and other large diameter municipal water systems.
Yes. Waterworks butterfly valves are commonly installed in buried valve vaults. Extension stems, floor boxes, and valve boxes can be supplied for grade-level operation. Coating and corrosion protection should be specified for the installation environment.
Standard inspection may include shell hydrostatic test, seat leakage test in both directions, coating inspection, dimensional inspection, and operating test. Test pressures and acceptance criteria should be confirmed according to AWWA C504 and project requirements.
Yes. Laux Valve provides OEM manufacturing, custom flange drilling, special seat and disc materials, actuator integration, custom coating, nameplate, and packaging to meet project specifications.
Contact LAUX Valve for technical drawings, torque calculation, material selection, NSF/ANSI 61 documentation, actuator integration, and OEM waterworks butterfly valve support.
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
