Locate the source, drive and receiving position for this task
Valve states connect the loading branch and high-pressure mobile-phase path. Check loading and injection separately. The diagram does not imply that the metering device is always in series with the high-pressure main path.
Define all ports, valve states, pressures in each state, shared volume and displacement volume. Follow the diagram to confirm liquid contact, pressure and destination before assigning drive and connection roles.
Check pressure and volume for the loop-loading mode
Specify ports, pressures, loop volume and loading mode in each state. Full-loop and partial-loop loading require different sample volumes. Coordinate loading direction, swept volume and materials with the actual method.
| Condition to compare | Information required | Selection affected |
|---|---|---|
| Loading mode | Full-loop, partial-loop and overfill loading | Distinguish total loading volume from effective injection volume |
| Pressure states | Pressure exposure during loading, injection and backflushing | Verify pressure rating and switching conditions |
| Port geometry | Loop, probe, fittings and shared volume | Compare actual injection with sample consumption |
Compare product options against task requirements
The following candidate options match this page's responsibilities. Compare them against the operating conditions described, then check capacity, materials and interfaces on the product pages. Card images show representative configurations; suitability must still be confirmed at actual operating points and by application results.
| Product category | Corresponding role | Confirm before selection |
|---|---|---|
| HP high-pressure injection valve | Pressurized injection-path switching | Check port pressures and sample loops in loading, injection and other states |
Check loading, injection and backflushing separately
Load in the specified state, then switch to injection and wait for pressure or signal recovery. Include backflushing, bypass or needle-washing states in the drawings where relevant.
Action records should link commands, valve or interface states and actual received results. When raw material, container or sample identity changes, reconfirm shared paths and conditions permitting the next step. Completion of drive movement alone does not replace task acceptance.
Validate using leakage, blanks and peak response
Check actual loop filling, leakage, pressure recovery, carryover and peak response. Matching valve interfaces establishes assembly compatibility only, not direct replacement suitability for an instrument.
| Validation scenario | Measurement or observation | Interpretation and action |
|---|---|---|
| Switching pressure | Check leakage, pressure recovery and valve state | For anomalies, locate the affected port and pressure-exposure stage first |
| Method performance | Compare blanks, peak responses and repeat injections | Successful mechanical switching still requires analytical-method validation |
Record test medium, configuration, installed path and operating sequence; present routine operating points and boundary results separately. Calculations support design discussions, component documentation checks models, and installed measurements confirm the actual task.
After an abnormality or maintenance, first identify which segment needs recovery
Mispositioning, shared-path residue or abnormal switching pressure can affect the next task. Stop pumping and check ports, then flush again after restoring the correct state.
Retain current source, container identity, completed actions, valve or interface state and actual receiving information. Use the table to locate the stage that changed before deciding to retry, continue or restart. After recovery, recheck the relevant operating point before returning an uncertain action to the automatic cycle.
Continue with tasks on the same branch
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