The short answer
Use #3, #4 or #5 as a preliminary catalog identifier, not a universal fit instruction. A compact housing needs a matched ring, body and basket, and the proposed bag must be checked against the exact manufacturer's configuration and installed-length reference.
Keep the catalog family attached to the number
The existing JINLV filter bag size chart lists #3, #4 and #5 within its own #1–#5 range. Keep that chart as the authoritative JINLV reference rather than creating another size table from mixed suppliers. Record the supplier name alongside every bag number in a comparison sheet.
Pentair's liquid-bag specification and Eaton's SENTINEL sheet publish different numbered dimensional arrangements. This shows why a familiar number cannot establish cross-brand equivalence. In particular, do not rename another manufacturer's compact bag as #5 just because its dimensions appear close to a JINLV entry. Request a model-specific drawing or a conditional custom proposal instead.
Build an identity packet for the installed housing
Start with the housing nameplate and model, the basket part reference, the existing bag packaging and photographs of the empty seat and retention parts taken during an authorized shutdown. Label which evidence came from the actual equipment and which came from a purchasing record. A handwritten store label may describe a previous substitution rather than the original design.
Include the ring profile and installed body envelope, not just body diameter and total loose length. Identify any special bottom shape, lining, insert or retaining arrangement. When documents disagree, retain the disagreement in the inquiry instead of selecting whichever dimension matches an available stock item.
Check the constraints that compact layouts can hide
A small vessel can still require significant space for cover movement, basket removal and safe handling of a wet bag. Nearby valves, pipe elbows and skid framing may obstruct that route. Confirm service access from the actual housing drawing and installation, not from a product photograph.
Within the basket, evaluate whether seam thickness, ring height or a bottom fold changes fit. Compactness is not evidence of low pressure, low temperature or harmless liquid. The operating envelope and safety procedure must be established independently of the housing's physical size.
Use a candidate-matching matrix
The matrix is an identification aid. A tentative match remains tentative until the interfaces and duty are accepted.
| Evidence received | What can be concluded | Required next check |
|---|---|---|
| Only '#3', '#4' or '#5' on an order | A possible catalog family has been named | Identify manufacturer, housing model and full bag code |
| Body dimensions close to the JINLV chart | A preliminary size candidate exists | Compare ring profile, basket geometry and length references |
| Correct ring but body gathers at the bottom | Mouth fit alone is insufficient | Resolve body length, bottom shape and installation |
| Different legacy model with no drawing | Equivalence remains unproven | Obtain safe reference evidence and evaluate a controlled custom sample |
Turn a tentative match into a defensible order
Ask the supplier to state which documented housing and basket the proposal addresses, the drawing revision, construction and unresolved assumptions. For a hypothetical distributor stock replacement, two boxes marked #4 may require separate records if their ring profiles differ. Combining them under one warehouse code would erase a meaningful distinction.
Agree incoming identification checks and a safe fit review before authorizing an operational trial. Do not use adapters, reshaped rings or extra closure force to make a near match pass. If nonstandard geometry is needed, give it a distinct controlled part number and retain the original catalog reference only as background. Record filtration performance separately; a compact bag that fits is not automatically adequate for the required flow or downstream quality.
Your review checklist
- Record manufacturer and full code beside the bag number.
- Identify the actual housing, basket and retention components.
- Reference the existing JINLV chart without merging supplier values.
- Check ring profile, installed body envelope and bottom shape.
- Verify cover movement, basket removal and safe handling access.
- Label conditional matches and custom parts distinctly in purchasing records.
Limits of this guidance
General identification guidance for compact installations. No universal dimensions, interchangeable housing list or pressure classification is asserted. Unidentified or modified equipment and nonstandard bags require responsible technical review before service.
Questions buyers ask
Is #5 always the next longer version of #4?
No. Numbering does not establish a universal progression in diameter, length or interface. Read the chosen manufacturer's chart and confirm the intended housing.
Can a compact housing accept a nearby standard size?
Only after documented interface and duty review. A near dimensional match is a candidate for evaluation, not evidence of sealing, support or safe operation.
Technical references
References support general principles or the named supplier's own products; they do not certify or validate a JINLV configuration.
- Standard Liquid Filter Bag Size Chart (#1–#5) | JINLV
- Liquid Filter Bags Spec Sheet
- SENTINEL Filter Bags Technical Data Sheet EN
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.