Procurement guide
Dual Plate, Swing and Silent Check Valve RFQ Comparison
Use the required reverse-flow function and installation conditions to prepare comparable check valve inquiries; do not select a type from the name or pressure class alone.
Direct answer
What should the buyer send first?
Use the required reverse-flow function and installation conditions to prepare comparable check valve inquiries; do not select a type from the name or pressure class alone.
Standards and certificate availability are confirmed separately for the quoted product and project scope.
Begin with the installation and reverse-flow requirement
State the intended installation orientation, flow direction and reverse-flow prevention requirement provided by the project. Include the available installation space, adjoining piping and any face-to-face requirement.
Dual plate, swing, lift, silent and other check valve descriptions identify different product references, but the name alone does not establish suitability for a specific line.
| Comparison input | Buyer information | Why it is kept explicit |
|---|---|---|
| Type | Dual plate, swing, silent, lift or project-defined | Avoids comparing unlike constructions |
| Orientation | Horizontal, vertical or project drawing | Keeps installation context visible |
| Connection | Wafer, flanged, threaded, welded or other | Aligns valve and adjoining piping |
| Operating duty | Medium, temperature and pressure conditions | Supports technical confirmation |
Provide the construction and interface data
List nominal size, pressure designation, required standard, body style, end connection and mating flange information. State body, disc, shaft, hinge, spring, seat and seal materials where the project defines them.
If the project specifies cracking pressure, closing behavior, allowable pressure drop, flow velocity, surge analysis or acoustic requirements, include the project value or engineering document rather than replacing it with a catalogue assumption.
Compare quotation scope and documents line by line
For a mixed BOM, keep each check valve as a separate line with its own size, pressure, connection, material, quantity and document requirements. The quoted configuration and document status can then be confirmed without transferring one product's data to another.
RFQ Checklist
- Required check valve type or function
- Installation orientation, flow direction and available space
- DN or NPS size and complete pressure designation
- Wafer, flanged, threaded, welded or other connection
- Body, disc, shaft, hinge, spring, seat and seal requirements
- Medium, working temperature and project operating conditions
- Quantity, destination and required drawing, report or certificate list
Unknown fields can be marked for confirmation. Do not replace a missing project requirement with an assumption.
Buyer Questions
Can a check valve be selected from pressure class alone?
No. Type, size, connection, orientation, materials, medium, temperature, operating conditions and required documents must also be reviewed.
Why should installation orientation be included?
It keeps the quoted product comparison tied to the actual piping arrangement and allows orientation-specific requirements to be confirmed.
What should be done when cracking pressure or surge data is unavailable?
Mark the requirement for confirmation and provide the available project or operating context. Do not insert an assumed value.
Reference Basis
Use the project-specified standard and edition. The links below identify official standards organizations; they do not prove that a listed BAODUN product has a certificate or approval.
Send the Requirement for Review
Share the known specification, quantity, destination, and document list so the product scope can be confirmed before quotation.
Send Your RFQ or BOM