3-43. CONTROL VALVE MAINTENANCE continued.
Drycleaning solvent P-D-680 is highly toxic and can ignite organic materials,
nitrates, carbides, and chlorates. Wear eye, skin, and respiratory protection. Use
in well-ventilated are.
Thoroughly clean multimedia filter control valve metal parts using drycleaning solvent.
Allow parts to air dry.
Inspect all valve parts, cartridge assembly, cap assembly, all threaded parts, and screws for damage and/or corrosion.
Replace damaged items. Clean corroded items.
Replace all damaged components.
There are six cartridges in the multimedia filter control valve. All are assembled
the same. One is shown.
Install valve seat (17).
Install keeper washer (12), rubber washer (13), washer (14), lockwasher (15) and nut (16) on valve shaft (10).
Install o-ring (11) and install valve shaft (10) in diaphragm housing (9).
Install diaphragm keeper (8), diaphragm (7), washer (6), lockwasher (5) and nut (4) in diaphragm housing (9).
Cartridge cap can be cracked if screws are overtightened. Do not exceed torque
Install cartridge cap (3), washers (2) and four screws (1). Torque screws to 65 pound-inches (7.345 N M.)