PICK VARIABLE FLOW SERVICE MANUAL
15
stopper during injection tube
disassembly.
DISASSEMBLY (MODELS 6X10
THROUGH 6X500) SEE FIGURE 3.
Remove the nuts and bolts retaining the
spring stopper from the unthreaded end of
the tube. Remove the spring stopper and
spring, and inspect each part for wear or
damage.
Depending on the condition of the injection
tube, it may be necessary to grasp the spring
stopper with a pliers, while lightly tapping
the outside of the injection tube.
IMPORTANT: DO NOT clamp the
injection tube in a vise to perform
maintenance.
DISASSEMBLY (MODEL 6X7) SEE
FIGURE 4.
To examine the piston and spring, remove
the shoulder bolt that holds the spring
stopper in the injection tube. A 1/8” Allen
wrench is required to remove the shoulder
bolt.
STUCK PISTON (ALL MODELS)A
stuck piston is usually the result of
foreign material wedging between the
piston and the tube.
Thoroughly clean the outer surface of the
piston and the inner surface of the injection
tube. Remove any sludge, welding slag or
other foreign material from inside the tube.
If necessary, sue a descaling agent to
remove lime deposits. Refer to the
discussion of cleaning fluids on page 11.
Note: Clean and inspect the steam elbow in
the inlet housing and any other piping where
debris may have accumulated.
Remove any burrs from the piston and tube.
The piston must move freely inside the tube
before reassembly. Scoring of the piston or
injection tube will not cause a problem as
long as the piston moves freely. Remove any
high points cause by scoring.
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