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Removal, Inspection, and Reinstallation
With the removal of wet end components follow the recommended safety procedures in place and
use your Personal Protective Equipment (PPE).
o
Disconnect the power source to the drive motor.
o
Relieve all pressure from the piping system.
o
Take all precautions to prevent environmental and personnel exposure to hazardous
materials.
o
Close the inlet and outlet shutoff valves.
o
Loosen the suction valve tie bar bolts and spring the suction piping slightly to drain any
liquid from the reagent head cavity. If the piping is closely connected it may be necessary
to disconnect a union or flange.
o
Remove the suction check valve assembly (ball contained within guide and seat), holding
it together as a unit.
o
Loosen the tie bar bolts on the discharge valve
and spring the piping slightly to drain any liquid.
o
Remove the discharge valve assembly, holding
it together as a unit as before.
o
Disassemble both valves and examine
components for wear. Seats should have sharp
edges or a small chamfer, free from dents or
nicks. Hold the ball firmly against its mating
seat in front of a bright light to inspect for fit.
Figure 36
OBSERVATION OF LIGHT BETWEEN THE BALL AND SEAT IS CAUSE FOR
REPLACEMENT OF EITHER OR BOTH COMPONENTS. FOR BEST RESULTS, ALWAYS
LOOSEN THE UNIONS OR FLANGES ON EITHER SIDE OF THE PIPING PRIOR TO RE-
TIGHTENING OF THE CHECK VALVE ASSEMBLIES. RE-TIGHTEN THE UNIONS OR
FLANGES AFTER THE CHECK VAVLES ARE TIGHTENED INTO POSITION.
Figure 37
o
Reassemble both valves using new parts as required. Sealing O-rings should always
be replaced.
o
Reinstall both valve assemblies, taking care to ensure that they are correctly orientated
with balls above seats.
o
Tighten the tie bar bolts evenly.
o
Torque the tie bar bolts according to the torque specification list in Appendix IV
