SSI America 90-2581 REV B manual Replacing Piston Seals

SINGLE

INLET HOLE

		W
	O
L
F

RING

		W
	O
L
F

INLET CHECK VALVE (SS)

MULTIPLE

OUTLET HOLES

		W
	O
L
F

INLET CHECK VALVE (PEEK)

		W
	O
L
F

RING

OUTLET CHECK VALVE (SS)

OUTLET CHECK VALVE (PEEK)

		W
	O
L
F

TRANSPARENT WASHER

OUTLET

SELF-FLUSH

CHECK VALVE

		W
	O
L
F

CROSS BALL RETAINER

INLET

SELF-FLUSH

CHECK VALVE

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.

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