Waters 717plus - Page 157

Troubleshooting Procedures 157
6
To run a valve test:
1. For each test, set valves and needle on the Valve and Motor Operations page as
follows:
2. For each test, run the pump at the designated flow until the required pressure is
reached.
3. Shut off the pump, and monitor the pressure for 15 seconds for pressure decay.
4. Test the valve release time under pressure by opening the valve being tested.
Pressure must be released in ≤ 3 seconds.
5. Repeat steps 1 through 4 for each test.
Test Checks Step 1 Step 2 Step 3 Step 4 Step 5
1 V1 and injector
seals
Needle in
Vial
V3 Open V2 Closed V1 Closed —
2 V2 Needle in
Stream
V3 Open V1 Open V2 Closed —
3 Needle port too
low in seal
Needle in
Seal
V3 Open V1 Open V2 Closed —
4 Needle port too
high in seal
Needle in
Seal
V3 Open V1 Closed V2 Open —
Test Checks Flow Rate (mL/min) Pressure (psi)
1 V1 and injector seals 1.0 4500
2 V2 1.0 4500
3 Needle port too low in seal 1.0 4500
4 Needle port too high in seal 1.0 4500
Test Checks
Allowable
Pressure
Decay (psi)
Leakage Locations
1 V1 and injector seals 500 Needle port, needle, or valve
housing
2 V2 500 Waste line or valve housing
3 Needle port too low in seal 500 Needle port
4 Needle port too high in seal 500 Valve V3 outlet