Wash Water Troughs. At quarterly intervals, check the level and
elevation of troughs. Draw water below the trough weirs, crack the wash water valve
and observe any low points where water spills over the weir before the weir is covered
Adjust the troughs as necessary to produce an even flow
throughout their lengths on both sides.
Twice a year, inspect the metal troughs for corrosion. If corrosion
exists, allow the troughs to dry, clean by wire brushing, and paint with an appropriate
protective paint or coating.
Operating Console. Operating controls for filter valves may be mounted
on a console, panel, or table. The controls actuate filter valves that may be powered
either by hydraulic or pneumatic means. The controls may be connected to the valve
mechanism either by cable or chain and operated through electrical, hydraulic, or
Perform these maintenance operations each week:
Clean the table, console, or panel inside and out, using
soap and water if necessary.
If the console is cable-operated, inspect it for leaks and stop
any leakage; if it is pneumatically operated, check tubing for possible leakage.
Perform transfer-valve maintenance as follows:
Adjust 4-way transfer valves and handles each month to
make sure that all filter valves open at the same rate. Tighten packing glands or add
new packing as necessary.
Lubricate transfer valves with grease each month. Do not
over lubricate the valves; one-half turn of the grease screw is generally sufficient.
Inspect the valve position indicator each month and adjust it
to read correctly in all positions.
Disassemble the 4-way transfer valves in the table each
year. Clean or replace any worn parts, seats, or washers.