Cleaning The Check Valves - Thermo Scientific Vanquish VH-P10 Operating Manual

7 • Maintenance and Service
7.7.3

Cleaning the Check Valves

When
Parts and additional items required
Preparations
Follow these steps
Page 158
4. Install the U-tube.
5. Purge the pump using the solvent for your application.
6. Inspect the check valves and connections for indications of leakage.
Tighten leaky connections.
7. Optional
Test the pump for leakage (see
•
Dirty check valves
•
Once a year
•
Syringe (12 mL), filled with isopropanol
•
Ultrasonic bath
Remove the check valves that you want to clean. It is recommended to
clean all check valves of the pump head at the same time. To remove the
check valves, follow the appropriate steps in
section 7.7.2, page 157.
1. In the direction of flow, fill the check valves with isopropanol, using
the syringe.
2. For 10 minutes, place the check valves in the ultrasonic bath.
3. In the direction of flow, rinse the check valves with isopropanol,
using the syringe.
4. Reinstall the check valves, following the appropriate steps
section 7.7.1, page 155
5. In Chromeleon, consider updating the Predictive Performance
information for the check valves.
section 7.11, page
section 7.7.1, page 155
or section 7.7.2, page
Vanquish Pumps (VH-P10) Operating Manual
170).
or
157.