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6. Carefully remove the two O-rings (438) from the ball guide and seat.
7. Carefully clean any parts to be reused. If any chemicals are used in the cleaning process, ensure that
they are compatible with the process liquid.
Reassembly
THE ORDER OF ASSEMBLY AND ORIENTATION OF THE SUCTION AND DISCHARGE
CHECK VALVES IS DIFFERENT. REFER TO FIGURE 5-14 FOR PROPER ASSEMBLY ORDER
AND ORIENTATION. IF CHECK VALVE CARTRIDGES ARE INSTALLED INCORRECTLY, ONE
OF THE FOLLOWING WILL OCCUR:
(A).IMMEDIATE SEVERE DAMAGE TO PUMP MECHANISM
(B).NO PUMPING
(C).REVERSE PUMPING ACTION (FROM DISCHARGE LINE INTO SUCTION LINE)
1. Drop the ball (437) into the curved inner chamber end of the body (003).
2. Set the body on a at surface so that the end with the ball faces upward. Position seat (024) on the body,
with the beveled edge of the seat facing outward. When the seat is pressed into the body the ball should be
sitting on the side with sharp corners as shown in Figure 5-14. The bevel should not face the inside of the
check valve. Use a at surface such as a board to press the seat into the body with rm, even pressure.
If the seat is improperly positioned, the ball will not create a tight seal and poor pumping performance will result.
3. Fit new O-rings (438) into position on the body (003) and seat (024).
DO NOT APPLY PTFE TAPE TO THREADS OF CHECK VALVE BODY AS THIS MAY PREVENT
ADEQUATE SQUEEZE FROM BEING APPLIED TO THE VALVE O-RING WHICH WOULD
RESULT IN LEAKAGE.
Note:
To assure a tight, leak free seal, new O-rings should be used each time the check valves
are disassembled.
4. Position the union end (432) onto the correct end of the body. Refer to Figure 5-14, as the correct
end is determined by whether the valve is intended for the suction or discharge port of the liquid end.
Slip the union nut (008) over the union end and screw tightly (hand tight only) onto the body.
5. Screw the valve assembly into the pump head (hand tight only). DO NOT OVERTIGHTEN.
4.5.4 CHECK VALVE REPLACEMENT: LIQUID ENDS GM0090~GM0500-STAINLESS STEEL
(SEE FIGURE 5-15)
Disassembly
Stainless steel check valves differ from the plastic versions in that the ball seat is integral to the ball
CAUTION
CAUTION
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