Graco HydroShield Instructions Manual page 99

Remove Remove the Remove the Isolation the Isolation Isolation Valve
This procedure requires the sleeve tool (112) and
stem tool (113). See Isolation System, page
1. Prepare the isolation system for service. See
Prepare the Isolation System for Service, page
93.
2. Remove the isolation valve from the cabinet. See
Remove the Isolation Valve from the Cabinet,
page 94.
3. Place the sleeve tool (112) over the isolation
valve sleeve (221) and screw onto the housing
(218).
4. Thread the stem tool (113) into the sleeve tool
(112) and tighten to interlock.
5. Rotate both tools (112, 113) as one to apply
pressure to the spring (220) inside. When both
tools are tightened, the valve is opened, allowing
the valve stem (222) to come out.
6. Insert a 3/16 inch Allen wrench into the end of
the valve stem (222) and turn with moderate
force to start.
7. Unscrew until the valve stem (222) can be pulled
out.
Note
Be careful not to scratch the valve stem
(222) when extracting and handling.
8. Unscrew both tools (112, 113) together until they
loosen the spring (220) and come off.
9. Unscrew the stem tool (113) from the sleeve
tool (112) and remove the isolation valve sleeve
(221) and spring (220).
10. Replace the valve stem o-rings. See
Isolation Valve Stem O-rings, page
Figure 39 Tools Removing Valve Stem
3A7370C
Valve Stem Valve Stem Stem
119.
Replace the
99.
Replace the Replace Replace the Isolation the Isolation Valve Isolation
Use this procedure to replace the three o-rings (219,
2 x 228) on the isolation valve stem (222). Replacing
these o-rings may be necessary if the isolation valve
begins to leak.
1. Remove the three o-rings (219, 2 x 228).
Note
Do not pry the o-rings off of the valve
stem. You may need to pinch the o-ring
to form a loop and then pull it off. You
may also cut each o-ring to remove.
2. Replace the o-rings:
a. Roll o-ring (219) over the valve stem (222)
threads until it fits into the groove.
b. Roll one o-ring (228) over the valve stem
(222) threads until it fits into the groove.
c. From the other end of the valve stem (222),
roll the second o-ring (228) onto the shaft
until it fits into the groove.
d. Grease all 3 o-rings.
Figure 40 Replacing the Isolation Valve
O-rings
3. Inspect the o-ring (219) inside the shuttle housing
(218) to make sure that it is still in place. Remove
and replace if needed.
Repair
Valve Stem Valve Stem O O O - - - rings Stem rings rings
99