Thermo Scientific thermoscientific Vanquish Pumps C, Operating Manual

Page: 165 / 296

7 • Maintenance and Service
Pumps C, Pumps F ( VC-Pxx, VF-Pxx)
Operating Manual Page 165
When
Damage of check valve or leaky check valve
Parts required
• Valve cartridge
• Valve nut, required only when leakage is present at the fitting
connection to the valve
Tools and additional items required
• Solvent suitable for purging to flush out harmful substances
• Solvent suitable for your application
• Open-end wrench, size 13 mm
• Tweezers, flat tips or curved tips
• Depending on the capillary connections:
¨
Viper capillary: Installation tool for Viper capillaries with torque
toothing
¨
Conventional capillary (non-Viper): Open-end wrench, size 1/4"
Preparations
1. To flush out harmful substances, purge the pump with an
appropriate solvent.
2. Turn off the pump flow and wait until the system pressure is down
to zero.
Follow these steps
1. Remove the capillary that connects the pump head to the purge/
sensor unit. Disconnect the capillary on both the pump head outlet
and purge/sensor unit.
2. Remove the U-tube.
3. Use the open-end wrench to loosen and remove the valve nut from
the pump head.
4. Remove the valve cartridge:
Valve Cartridge Action
Valve cartridge removed together with
valve nut Hold the nut over your hand and turn it
upside down to allow the cartridge to drop
into your hand.
Valve cartridge remained in pump Pull out the cartridge using the tweezers.