1. Start with the equipment and assembly
Record the equipment manufacturer, equipment model and the assembly in which the valve operates. An equipment serial number, bill-of-materials reference or maintenance drawing can help distinguish installations that look alike. Keep the equipment reference separate from the component model so that a supplier can understand both.
Describe the scope of the purchase: a complete valve bank, an individual valve, a cartridge or another service component. In the supplied catalogue, FDD125/40.02 identifies a valve cartridge, while other pages show assembled valve banks. A photograph of a bank does not establish which internal component is required.
2. Preserve the complete identification
Transcribe every visible character from the nameplate or existing procurement record, including punctuation, suffixes and revision information. Place an original photograph beside the transcription. Mark an uncertain character with a note rather than silently choosing the closest-looking letter or digit.
Manufacturers may use extended order codes to distinguish configurations. HAWE’s VB documentation, for example, separates ordering information across the bank and its elements. This illustrates why an abbreviated family name can omit information; it is not a coding key for the CHILL catalogue. Never infer the meaning of one manufacturer’s code from another manufacturer’s system.
3. Build a useful evidence set
Use safe existing records first. Do not remove a component, loosen a connection or operate equipment merely to improve an inquiry photograph. Any access or measurement requiring intervention belongs under the site’s isolation procedures and qualified personnel.
| Evidence | What to include | What it does not prove |
|---|---|---|
| Identification | Full nameplate and unedited model reference | Suitability for a different machine |
| Context | Equipment and assembly drawing references | The condition of the installed component |
| Interfaces | Approved drawing, ports and mounting dimensions | Thread or seal compatibility from appearance alone |
| Function | Schematic position and specified hydraulic function | That similar housings contain the same internals |
4. Separate an exact replacement from an alternative
For an exact replacement, ask the supplier to confirm the full ordered identity against the available record. If the original item is obsolete, unavailable or uncertain, identify the request as an alternative requiring technical review. Avoid describing an unreviewed proposal as interchangeable.
A comparison should list the existing reference, proposed reference, functional differences, interface differences and documents supporting the proposal. The equipment engineer should review the differences before purchase approval. A common envelope size or port count is only one part of that review.
5. Keep a short confirmation log
Attach the log to the quotation review. If a supplier resolves an ambiguity, record the answer and its document reference rather than replacing the original evidence. This keeps the purchase history useful for the next maintenance cycle.
- Confirmed: information supported by the equipment record, original marking or approved drawing.
- To confirm: ambiguous characters, missing suffixes, unclear mounting details or undocumented changes.
- Required from supplier: proposed model, drawing revision and the documentation relevant to that model.
- Required from buyer: technical approval owner, quantity, destination and purchasing deadline.
6. Send an identification-led inquiry
A concise opening can state: “Please help identify the item shown in the attached nameplate and assembly drawing. The full visible reference is [reference]. We need [quantity] complete units or components. Items marked ‘to confirm’ require review before we approve a replacement.” Attach the evidence as separate, clearly named files. Use the product range to choose an inquiry category, but retain the actual component reference in the message.
Next step: review the component families at the product range, then send the identification record through the inquiry form. The inquiry starts a technical discussion; it does not approve installation or substitution.
Frequently asked questions
Can a clear photograph replace a drawing?
A photograph helps identify markings and visible configuration. It usually cannot establish internal function, tolerances, hidden interfaces or the full approval basis. Send a drawing or equipment reference when available and identify the gaps explicitly.
Should I remove a suffix if it does not appear in the catalogue?
No. Preserve the original code exactly and ask what the suffix means. It may reflect a configuration or revision that a general catalogue page does not explain.
What if the nameplate is unreadable?
Send the equipment model, assembly reference, existing purchasing records and safe photographs. Label the model as unconfirmed. Do not assign a catalogue model solely because its photograph resembles the installed part.
Turn the checklist into a clear inquiry.
Use your model, drawing revision and application requirements to start the next discussion.
Explore hydraulic products Prepare a technical inquiryGeneral purchasing information, not equipment-specific engineering approval. Installation, pressure settings, substitutions and maintenance require the responsible specialist and the equipment manufacturer’s procedures.