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Replacing Check Valves
Check valve failure may be indicated by a severe loss in flow rate. However, a
leaking piston seal can also result in low flow rate and is more common than
check valve failure. Inspect for a leaking seal before replacing the check valve.
Tools required
Description
Appropriately sized open ended wrench (delivered with the pump head).
Preparations
Pump head is already removed.
Damage to check valve cartridges
C A U T I O N
➔
1 Remove the inlet and outlet check valves; they are threaded into the liquid
2 Remove the check valve cartridge. If needed, use compressed air to remove
SD-1 Solvent Delivery - User Manual
Do not disassemble check valve cartridges. Reassembly requires strict cleanroom
conditions and great expertise. Sub-assemblies are not available for check valve
cartridges.
head.
the cartridge. Do not use a sharp tool that could damage the check valve or
the support.
Maintenance and Repair
Replacing Check Valves
8
97
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Troubleshooting
