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Cleaning Check Valves
A pressure drop may indicate that one of the check balls has become coated
with gummy or particulate matter or that a small particle has become lodged
on the seat; in either case the check ball will not seat correctly and pressure
will be lost. It may be possible to rectify this problem using isopropanol to
dissolve the foreign matter.
When
Occasionally, especially in case of drop in backpressure.
Cleaning Check Valves with Isopropanol
1 Disconnect the outlet tubing and connect a line to a waste bottle.
2 Check miscibility of solvent in the pump head with isopropanol.
3 Isopropanol and solvent in pump head miscible: Pump isopropanol in the
4 With the pump head filled with isopropanol, stop the flow for
5 Flush the isopropanol from the head and return to operating conditions.
SD-1 Solvent Delivery - User Manual
pump head
OR
Isopropanol not miscible with solven in the pump head:
1 Pump an intermediate solvent in the pump head (see
Miscibility"
on page 120)
2 Pump isopropanol in the pump head.
approximately 15 min to dissolve deposits.
(Using an intermediate solvent if necessary.)
Maintenance and Repair
Cleaning Check Valves
"Solvent
8
95
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Troubleshooting
