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SERVICE TECH. INFORMATION
SECTION 5
23
5B. 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 backside of
the valve to allow pressure water to bleed out.
Catch the 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 disassemble.
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 POSIĆ
TION. 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.