Chapter 3: Repair & Replacement Procedures
Industrial Dynamics Company, Ltd. ©
Form 42600 (10/03)
3-3
1. Remove the 4-40 x 1/4-inch screw that secures the ring in the bottom
cavity of the starwheel
hub.
2. It may be possible to remove the seal ring by hand, but if it is wedged
too tightly, obtain three 4-40 x 1-inch screws and insert them in the
threaded holes in the seal ring. These three threaded holes are on 120
degree radii that are slightly larger than the valve port holes. Screw
the 4-40 screws into the seal ring symmetrically forcing it out of the
hub. If the seal ring appears to be repairable, proceed as follows,
otherwise go to Step #4.
3. Using 320 grit emery paper, placed on a very flat surface such as a
surface plate, press the seal ring against the emery paper and move in
circular motions until all blemishes have been removed. This process
should be carried out on both sides of the seal ring. Do not remove
more than 0.4 mm (0.015 inch) from each side of the seal ring.
After all blemishes have been removed with the 320 grit emery paper,
then use the 500 grit emery paper to put the smoothest possible finish
on both sides of the seal ring. It is absolutely necessary that the seal
ring be kept as flat and true as possible. Keep uniform pressure on the
seal ring, rotating it during the sanding motion. If the seal ring is
sanded to a wedge shape, it will not seal properly against the valve
plate.
Figure 5-1.
Seal Ring
