Water Pump User Manual

102
Simple Repair Procedures
The procedures described in this section can be done with the quaternary
pump in place in the system stack.
Table 7 Simple Repair Procedures
Procedure Typical Frequency Notes
“Exchanging the Active Inlet Valve
Cartridge or the Active Inlet Valve” on
page 103
If internally leaking Pressure ripple unstable, run leak test for
verification
“Exchanging the Outlet Ball Valve” on
page 106
If internally leaking Pressure ripple unstable, run leak test for
verification
“Exchanging the Purge Valve Frit or the
Purge Valve” on page 108
If internally leaking Solvent dripping out of waste outlet when
valve closed
“Exchanging the Purge Valve Frit or the
Purge Valve” on page 108
If the frit shows indication
of contamination or
blockage
A pressure drop of > 10 bar across the frit
(5 ml/min H
2
O with purge open) indicates
blockage
“Exchanging the Pump Seals and Seal
Wear-in Procedure” on page 112
If pump performance
indicates seal wear
Leaks at lower pump head side, unstable
retention times, pressure ripple unstable —
run leak test for verification
“Exchanging the Plungers” on page 115 If scratched Seal life time shorter than normally
expected — check plungers while changing
the seals
“Installing the Continuous Seal Wash
Option” on page 116
If seals show indication of
leaks
Leaks at lower pump head side, loss of wash
solvent