OV-II Maintenance, Troubleshooting and Service Manual
3-4
Industrial Dynamics Company, Ltd. ©
Form 42600 (10/03)
4. Clean the grit off the seal ring and blow out all holes with
compressed air. Note that the seal ring is keyed into the hub by a
small stainless steel pin, which is located on a slightly smaller radius
than the valve port holes. Line up the keying hole in the seal ring with
the pin in the hub and insert the seal ring in place. Lock it in position
by using the 4-40 x 1/4-inch screw. The seal ring requires no
lubrication.
Valve Plate
To replace the valve plate proceed as follows:
1. Remove the valve plate by removing the four 10-32 x 1/2-inch cap
screws that secure it to the valve plate support ring.
2. The support ring has four o-ring seals located in recessed grooves
to make a positive seal with the valve plate. Remove the o-rings and
clean the support ring thoroughly. If the o-rings are damaged, replace
them.
3. Fasten the new valve plate in position, using the four bolts removed
from the old unit. The valve plate should seat firmly against the
support ring forming an airtight seal by compressing the o-rings.
