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SERVICER’S TECH. INFORMATION
SECTION 5
27
5D. ROTARY VALVE SERVICE
Before working on the valve, turn off the water
supply and disconnect from electrical power. TO
RELIEVE PRESSURE:
-- 3 VALVE BYPASS: Close the inlet valve and open a
soft water faucet. Then close the outlet valve and open
the bypass valve.
-- SEARS SPECIAL BYPASS: Slide the bypass valve
stem to bypass position. Loosen the 3 hex head screws
(see A in drawing) toward the back side of the valve to
allow pressure water to bleed out (catch water with a
rag).
DISASSEMBLY
To remove a part or group of parts, refer to the valve
drawing. A common screwdriver or nut driver, Phillips
screwdriver and pliers are the only tools needed to
completely disassembe.
SERVICING THE VALVE
Inspect all oĆrings, seals and gaskets for wear or
defects.
Inspect the bottom surface of the rotor and disc for
scratches, chips or wear.
NOTE: If replacement is needed, be sure to use the
current replacement part.
ASSEMBLY
Be sure all parts are in place and in the proper
position. Lubricate ALL oĆrings and seals with FDA
approved silicone grease. To install the rotor seal, first
place the seal into the valve groove, rounded side
down (see crossĆsection). Apply a light coating of
silicone grease to the seal's crossing ribs. Then,
carefully center the wear strip on the seal, and push it
downward onto the seal.
Install the nozzle and venturi seal and drain seal.
Assemble 2 oĆrings and the wave washer onto the
rotor and disc. Then center the rotor and disc, in the
valve body, on the rotor seal.
Lower the cover onto the valve body and rotor shaft.
Then install the cover holding screws. Before
tightening the screws, install the valve cam and
gear. Then, turn the rotor (clockwise only) to
service position. Tighten the screws using a
crissĆcross pattern. If a torque wrench is available,
torque to 30Ć40 inch pounds.
switch
valve cam
& gear
rotor & disc
o–ring
rotor seal
drain seal
nozzle &
venturi seal
wear strip
seal
cross–section
view
flow plug (backwash
and fast rinse flow
rate control)
SEE NOZZLE
ASSEMBLY SERVICE,
SECTION 3
Lubricate the gear on the motor, and the valve cam
gear with Molykote grease, or other high quality gear
lubricant.
Be sure to orient switch as shown, with lever toward
the cam.