✓SMD流量控制工程
•Published: 2026-07-18•⏱ 6 分钟阅读
FACTORY EVIDENCE · 100% REAL WORKSHOP
A valve RFQ is most effective when it defines the service before it defines the commercial target. Start with the medium and composition, normal and design pressure, normal and design temperature, flow direction, cycling frequency, installation orientation and any corrosion, abrasion, solids or flashing concerns.
Define the valve construction and interfaces next: valve type, nominal size, pressure class, bore, end connection, face-to-face requirement, body and trim materials, seat and sealing system, stem arrangement, operator or actuator, accessories and fail position. If an existing drawing or data sheet governs the interface, attach it and identify the revision.
The RFQ should state the applicable product standard, project specification and edition. Inspection requirements also need to be explicit: ITP, hold and witness points, PMI, dimensional checks, NDT, pressure and leakage tests, coating inspection and third-party involvement.
Finally, list the documents required at quotation, approval and release stages. Typical items include drawings, data sheets, material certificates, inspection records, NDT reports, pressure-test reports, marking records and the manufacturing record package index. A complete RFQ reduces assumptions, clarification cycles and late changes.
Engineering Q&A
Technical FAQ & Design Criteria
Critical engineering answers referenced against API / ASME / ISO standards.
What are the most common omissions in industrial valve RFQ datasheets?↓
The most frequent omissions include exact fluid composition with particulate percentage, transient temperature swings, required NDT percentage (10% vs 100% RT/UT), and whether third-party inspection (TPI) witness is mandatory before hydro-testing.
Why should the valve face-to-face standard be explicitly defined in the RFQ?↓
Face-to-face dimensions differ significantly between standards (such as ASME B16.10, EN 558 series, or API 6D short pattern vs long pattern). Specifying the exact standard ensures compatibility with existing spool piece piping.
What documentation level is required for EPC project milestone sign-off?↓
EPC projects typically mandate an EN 10204 3.1 material test report, a stamped 19-point ITP matrix, hydro-test pressure-time charts, PMI spectrometry logs, and NDT examination records consolidated into an MDR dossier.
Tags:#询价#总承包#代加工#阀门采购
Share This Engineering Guide
Pass this technical specification and valve standard breakdown to your project procurement and piping design colleagues.
面向EPC与OEM采购方的工业阀门RFQ询价清单
Official engineering resource by SMD Flow Control
