A complete RFQ helps a valve supplier check compatibility, build the correct configuration and avoid quoting assumptions that later need to be reversed. Use the checklist below for HF-520 or any comparable butterfly valve review.
Minimum information
- Medium: fluid name, concentration, additives, solids and cleaning media.
- Pressure: normal, maximum and differential pressure; include transients if known.
- Size: DN/NPS and required quantity by size.
- Temperature: normal, minimum and maximum fluid temperature; ambient range for actuators.
- Connection: mating-flange standard, pressure designation and any dimensional constraints.
- Duty: isolation, on/off or modulating; expected operating frequency.
- Actuation: handle, gear, pneumatic, electric or bare shaft.
Material and performance questions
| Body material | Is aluminum alloy acceptable, preferred or excluded by the project specification? |
|---|---|
| Disc | State any required stainless grade, coating or material restriction. |
| Seat | Provide the medium and service temperature; name a seat only when the project requires it. |
| Shutoff | Reference the required test standard, leakage class and acceptance criteria rather than using an undefined absolute phrase. |
| Testing | State pressure-test, inspection, witness and certificate requirements. |
Actuator details
Pneumatic package
- available air pressure and air quality;
- double-acting or spring-return;
- fail-open, fail-close or fail-in-place;
- on/off or modulating control;
- solenoid voltage, limit switches, positioner and manual override;
- area classification and enclosure requirements.
Electric package
- voltage, phase and frequency;
- on/off or modulating duty and control signal;
- required opening/closing time;
- position feedback, local controls and manual override;
- enclosure, ambient temperature and hazardous-area requirements.
Commercial and documentation details
- Quantity by size and operator configuration
- Delivery destination and target date
- Incoterm or quotation basis, when known
- Required drawings, test certificates and material documents
- Customer specification or approved-vendor requirements
- Sample, prototype or first-article expectations
Copyable RFQ format
Product: HF-520 aluminum butterfly valve
Medium and concentration:
Working / maximum pressure:
Size and quantity:
Normal / maximum temperature:
Mating flange standard:
Disc and seat preference:
Duty and operating frequency:
Actuation and controls:
Installation environment:
Required tests and documents:
Delivery destination / target date: