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RING
OUTLET CHECK VALVE (PEEK)
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RING
INLET CHECK VALVE (PEEK)
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CROSS BALL
RETAINER
INLET
SELF-FLUSH
CHECK VALVE
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TRANSPARENT
WASHER
OUTLET
SELF-FLUSH
CHECK VALVE
SINGLE
INLET HOLE
INLET CHECK VALVE (SS)
MULTIPLE
OUTLET HOLES
OUTLET CHECK VALVE (SS)
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Figure 5-5. Check Valves
5.2.3 Replacing Piston Seals
Lower than normal pressure, pressure variations, and leaks in the
pumping system can all indicate possible problems with the piston
seal. Depending on the fluid or mobile phase used, piston seal
replacement is often necessary after 1000 hours of running time.
Each replacement seal kit contains one seal, one backup washer,
one self-flush seal, one non-flush guide bushing, two seal
insertion/removal tools, and a pad to clean the piston when changing
the seal.