The short answer
A custom sintered-element RFQ needs both a filtration specification and a controlled assembly drawing. Define how the element seals, carries load and joins to solid fittings; a material name, micron value and overall length cannot establish interchangeability.
Separate the functional zones on the drawing
Identify the porous filtering zone, support zone, solid joining lands and sealing interfaces. Mark which surfaces must remain permeable and which must prevent bypass. Mott's porous-metal overview describes fabrication considerations that differ from solid metal; buyers should therefore request an agreed manufacturing approach instead of assuming ordinary machining or welding leaves filtration unchanged.
Dimension the active filtering length separately from the overall length. Show any area obscured by collars, support overlap or joints. Request the proposed effective area and its calculation basis. If the supplier changes the joining detail during design, confirm whether the active area, flow path or cleaning access also changes.
Define fit from functional datums
Choose datums that represent how the element actually locates in the housing. Specify the sealing face or shoulder, mating bore or thread, insertion depth and clearance envelope. Nominal cartridge length is not a substitute for these dimensions. Include the housing mating drawing or a controlled measurement report, not only a photograph of the old part.
| Drawing feature | Information to include | Acceptance method |
|---|---|---|
| Seal interface | Gland geometry, seal compound and mating surface | Dimensional report and approved assembly leak test |
| End connection | Thread standard or fitting detail, datum and engagement | Appropriate gauges and fit verification |
| Filtering zone | Media architecture, grade definition and active dimensions | Specified retention and clean-flow tests |
| Support and core | Material, open area, attachment and load direction | Design review plus agreed mechanical evidence |
| Joint region | Joint location, method and inspection requirements | Applicable inspection and bypass assessment |
| Assembly envelope | Overall dimensions, straightness and installation clearance | Finished-part dimensional inspection |
Keep the fabrication proposal separate from approval
Ask the supplier to identify every joint and its purpose: structural load transfer, sealing, attachment or a combination. Require the proposed materials, inspection method and any processing that could affect cleanliness or local permeability. Do not prescribe an unqualified weld procedure in a purchasing article, and do not treat a visually continuous seam as proof of a leak-tight assembly.
State the normal and any approved reverse-flow direction, differential pressure at temperature and vibration or handling loads relevant to the equipment. The support must be reviewed with the media and connections. If the buyer supplies only a loose sample, record that its wear, deformation and unidentified materials are uncertainties, not authoritative design requirements.
Agree the first-article release package
Freeze a revision-controlled drawing before production. Require a deviation list and a first-article report that separates dimensional conformity, material traceability, filtration performance and assembly leakage. Each result should identify the tested part and method. A fit check in one housing verifies that interface only; it does not prove retention or capability throughout the service envelope.
Define packing cleanliness, identification and handling protection appropriate to the application. Request change notification for media construction, joining, support, seal compound or subcontracted critical parts. Where a substitute is proposed, assess its affected functions rather than accepting the label equivalent. Keep the accepted first article or its controlled inspection record as a reference for subsequent deliveries.
Your review checklist
- Provide the housing interface and a revision-controlled assembly drawing.
- Separate overall dimensions, active media dimensions and solid joining zones.
- Specify media retention method and clean-flow acceptance conditions.
- Identify every joint, support member, seal compound and normal flow direction.
- Request a first-article package with traceability and agreed inspection results.
- Define deviation approval, identification and future change-notification requirements.
Limits of this guidance
General RFQ guidance, not a released drawing or fabrication instruction. Qualified engineering review must approve interfaces, joining and mechanical loads; supplier capability and JINLV inspection documents remain model-specific.
Questions buyers ask
Is a sample sufficient for a quotation?
It can support an initial review, but unknown materials, wear and hidden interfaces must be resolved. Confirm a controlled drawing and functional specification before production approval.
Does a matching 222 or 226 designation prove interchangeability?
No. Verify the actual mating dimensions, seal arrangement, locking features and installed envelope. A familiar end-cap label does not cover every housing variation.
Technical references
References support general principles or the named supplier's own products; they do not certify or validate a JINLV configuration.
AI-assisted technical synthesis of the references below, with editorial checks. This is general procurement guidance, not an independently signed engineering review or a product validation report.
English is the indexing version. Chinese and Indonesian are reading translations of the same article.