Medivators DSD EDGE - Valve Seal Replacement; Replacement Procedure

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NNUAL PM INSTRUCTIONS
PREVENTATIVE MAINTENANCE KIT
Valve Seal Replacement
Parts Required Part number Qty
Replacement valve seal kit 78401-261 (10 seals, screws and
Loctite per pack)
Tools Required
 9/64-inch Allen wrench
 3/32-inch Allen wrench
 Valve stem wrench MW03-0002
 John Guest Tool 47049-157
 Small vise grips
Procedure
 Lay the main module back on the work surface.
 Note or label the air hose that connect the Mac valve to the pneumatic block valves.
 Using a 9/64-inch Allen wrench, remove the four screws holding the top valve to the main manifold. Refer to figure
30.
 Set the valve on the work surface so the valve seal is facing up.
 Pull the old valve seal off the retaining screw. Refer to figure 31.
 Use the valve stem wrench to hold the valve shaft and using the 3/32” Allen wrench, loosen the retaining screw in
the center of the valve seal. If the screw does not easily release, do not attempt to remove with the wrench. Grip the
edges of the screw with a vice grips pliers and unscrew. Once released use the 3/32” Allen wrench to remove the
screw completely. Refer to figure 32.
 Ensure that the valve is completely clean; remove any traces of dried Loctite from the screw mounting area.
 Assemble the new valve seal. Apply a small drop of Loctite to the screw threads and re-assemble the valve seal to
the valve shaft.
 Tighten the valve seal retaining screw until the seal deforms the shape. Refer to figure 33.
 Reattach the block valve to the main manifold. While pressing down on the block valve with your thumb, tighten the
screws in a uniform diagonal manner to minimize the deformation. Do not over tighten the screws.
 Repeat the above procedure for each valve on the A and B main manifold and the side B station water &
disinfectant valve. Refer to figure 34
.