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Instruction Manual
D100380X012
Figure 4. Grounding Assembly
37A6528‐A
To adjust the hub seals:
1. Tighten both thrust‐plate cap screws (key 10) 1/4 turn on one side (the side where shaft leakage is occurring).
CAUTION
To avoid excessive side thrust on the disk and possible liner damage, tighten cap screws on both sides of the valve
alternately and in 1/4‐turn increments. Do not over‐tighten by continuous turning or by tightening one side only. Over‐
tightening the cap screws will cause the liner to fail.
2. Tighten both thrust‐plate cap screws 1/4 turn on the other side of the valve.
3. Repeat steps 1 and 2 until leakage stops.
Note
If this adjustment is being performed to stop minor leakage past the disk, check the leakage after turning the cap screws enough
to move the thrust plates 0.8 mm (1/32 inch) closer to the valve body. If leakage has not stopped or diminished, the leakage is
probably due to incorrect linkage adjustment or damaged valve parts. Refer to the Linkage section to check linkage adjustment;
refer to the Maintenance section to inspect and replace parts.
4. If leakage around the shaft cannot be stopped by adjusting hub seals, refer to the Maintenance section to inspect
and replace damaged parts.
ACTUATOR END PLATE
9500 Valve
February 2019
7
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