Replacing Check Valves - Teledyne CombiFlash Rf User Manual

+
CombiFlash® Rf User Manual
Figure 8-11 Check valve holders
2. Remove check valves from pump head and place in a
beaker of methanol. Sonicate check valves for 15 to 20
minutes.
3. Reinstall check valves into pump head making sure that
the ends of the check valves (with multiple holes) are
facing up towards the outlet of the pump.
4. Reinstall check valve holders and tighten finger tight.
Then using pliers tighten an additional ¼ turn.
5. Check the flow rate delivery. If the flow rate delivery is still
incorrect, replace the check valves. The correct flow rate
depends on the back pressure of the carrier solvent. The
flow will be 0.5 mL/minute until the fluid interface reaches
operating pressure, then reduces the flow rate to 0.2
mL/minute under typical operating conditions for the fluid
interface. The operating mode can be determined by
listening to the pump operate. While running at 50 ml/min,
the pump motor speed is continuous. Once operating
pressure is reached, the pump has a rapid refill stroke
approximately that occurs ~ 8 seconds.

8.6.12 Replacing Check Valves

1. Install new check valve cartridges (PN: 250-0001-17) into
pump head housing making sure the ends of the cartridges,
8-18