Procurement guide
Wafer, Lug and Flanged Butterfly Valve Comparison
Direct answer: Wafer, lug and flanged describe different piping interfaces and construction requirements. Compare the requested connection with the adjoining piping, then confirm size, pressure, body, disc, seat, stem, actuation, medium, temperature and document requirements before quotation.
Information to Compare
| Comparison field | What to state | Why it matters to the RFQ |
|---|---|---|
| Wafer | State the adjoining flange, drilling and installation requirements supplied by the project. | The piping interface and installation constraints must be compared together. |
| Lug | State the required lug arrangement and adjoining piping requirements. | The requested lug construction must be confirmed against the project interface. |
| Flanged | State the required flange standard, drilling, facing and dimensional requirements. | The valve flange and adjoining flange requirements must be reviewed on the same basis. |
| Seat and disc | List specified seat, disc, stem and body materials. | Material fields should be checked against the medium, temperature and project specification. |
| Size and pressure | Provide DN or NPS and PN or pressure class. | Every quoted line should match the requested size and pressure fields. |
| Actuation | State lever, gearbox, pneumatic, electric, or another requested method. | Actuation changes the requested assembly and control information. |
| Service conditions | Provide medium, temperature, orientation, and installation constraints. | Service data helps identify fields that require confirmation before quotation. |
Buyer Questions
Is nominal size enough to compare butterfly valves?
No. Include pressure rating, connection, materials, actuation, medium, temperature, and project requirements with the size.
Why should the adjoining pipe connection be included?
It helps confirm that the requested valve connection and the piping interface are being compared on the same basis.
How should missing material details be handled?
State the known medium and operating conditions, mark the material field for confirmation, and avoid substituting an unverified material.
Prepare the Inquiry
Use the checklist to organize known requirements and mark missing fields for confirmation.
Send Your RFQ or BOM