Valve Type and Code Identification: How to Avoid Specification Errors
A valve code is meaningful only inside the coding system that created it. Manufacturer model strings, piping-class item codes, equipment tags, Chinese type-designation conventions and ERP stock numbers can use the same letters or digits differently. Decoding by guesswork can lead to the wrong pressure class, materials, trim, ends or actuator. The safe method is to preserve the original code, identify its issuer and revision, obtain the legend, then verify every decoded attribute against nameplate, datasheet and drawing evidence.
Identify what kind of code you are reading
A project tag identifies functional location; it usually does not fully encode the manufacturer construction.
A proprietary model may encode series, size, class, ends, materials or options under a specific catalog revision.
An EPC or owner code links a component to a controlled piping class and commodity description.
A structured convention can describe attributes, but applicability and symbol meanings depend on the controlled standard/edition.
Serials trace an assembled valve; heat numbers trace material. They should not be substituted for product model identity.
A stock number supports logistics and may omit engineering details needed for replacement or service review.
Cross-check every code against independent evidence
| Data field | Possible source | Verification evidence | Common error |
|---|---|---|---|
| Valve function/type | Tag description, model legend or datasheet. | P&ID duty, approved datasheet and section drawing. | Assuming a letter has the same meaning across manufacturers. |
| Nominal size and bore | Model string, nameplate or piping item description. | End dimensions, bore drawing and pipeline size/schedule. | Confusing nominal size with actual bore or port configuration. |
| Rating or pressure class | Nameplate/model/piping class. | Applicable rating standard, material group and design temperature. | Treating PN/Class digits as a fixed allowable pressure. |
| End connection | Model option or commodity code. | Approved flange/weld/thread standard and detailed drawing. | Ignoring flange series, facing, schedule or preparation. |
| Body/trim/seal materials | Model suffix or trim number. | Bill of materials, certificates and component traceability. | Using a trim number without the issuer's edition-specific table. |
| Actuation/options | Model suffix, actuator tag or package code. | Valve-actuator data, fail action, accessories and interface drawing. | Ordering the valve model without the required package options. |
A reliable replacement identification package
Capture full valve, nameplate, body markings, ends, operator and orientation.
Locate datasheet, purchase order, drawing, manual and model legend.
Verify face-to-face, flanges/weld ends, bore, stem and actuator envelope.
Confirm fluid, pressure-temperature cases, direction, function and cycles.
List each symbol, proposed meaning, source and confidence or open question.
Require a proposed datasheet and deviations rather than ordering from code alone.
Claims and shortcuts this page does not support
There is no universal valve-code decoder
Identical characters may carry different meanings in national, project and proprietary systems.
A model number is revision-dependent
Catalog options and symbol meanings can change; preserve manufacturer and document revision.
Decoded text does not prove delivered construction
Nameplate, drawing, bill of materials, certificates and inspection must close the identity chain.
From requirement to auditable evidence
Information and records to define
How this resource should be used
Troubleshooting and replacement guidance for users trying to decode a valve model, tag, trim or type code without introducing false universal meanings.
Raymon Valve technical content team. Final project decisions require the controlled documents and responsible engineer or quality reviewer.
Code meanings must come from the controlled issuer document and edition. This page intentionally provides no universal symbol table because applying one system's legend to another can create unsafe procurement errors.
Technical scope reviewed 27 July 2026. Editions, procedures, acceptance criteria and product evidence must be reconfirmed before order.
Valve Type Codes and Datasheet Identification FAQ
Is there a universal industrial valve coding system?
No. Standards, manufacturers, owners, EPCs and ERP systems use different schemes. First identify the code owner and correct legend.
What is the difference between a valve tag and model number?
A tag identifies the valve's project/system location and duty; a manufacturer model identifies a product configuration. Either may reference other documents and neither should be assumed to contain every attribute.
Can a trim number identify all internal materials?
Only when used with the correct issuer's controlled trim table and edition. Verify the bill of materials because seats, stem, closure and overlays may need more detail.
How should an obsolete valve be replaced when the code is unclear?
Reconstruct the requirement from nameplate, drawings, measured interfaces, service conditions and function, then obtain an approved replacement datasheet and deviation review.
Send the requirement and the evidence you need to verify
We will identify the applicable scope, missing records and approval path without inventing compliance claims.
English 
German 
Arabic 
French 
Spanish 
Italian 
Portuguese 
Russian