3
Model 50 Duplex Basket Strainer, Sizes 5
” - 8”
Operation
The chamber in operation can be determined by observing
the position of the valve handle. The
handle is on the same side of the center line as
the chamber in operation (see Figure 4).
Start up
Open both chamber vents, if strainer is so equipped (see
figure 3), to expel air from the
strainer.
Position valve handle in the center to allow both chambers
to fill and close the equalizer valve, if strainer is so
equipped (see figure 2).
Slowly allow fluid to enter strainer by opening OUTLET
valve first, then followed by opening the INLET valve.
CAUTION: Start system GRADUALLY. This
eliminates sudden shock to strainer and
other equipment in the line
.
Close vents when air is expelled and fluid begins to leak out
vent.
Move valve handle to extreme travel position over one
clean basket. DO NOT leave valve handle in the center
position as both baskets will become dirty. This would
require interrupting flow to clean them.
Seat valve plug lightly by turning valve yoke clockwise. To
avoid excessive stresses, stuck valve plugs etc. when
operating at temperatures above 120°F use only
minimum hand pressure on the valve yoke to position the
valve plug against the seat.
The valve plug should be firmly seated during basket
cleaning to prevent excessive leakage into the opened
chamber.
Start up, Continued
NOTE: The strainer valve plug is intended to
divert flow. It is not designed to provide
absolute tight shut off. Product design
criteria requires valve plug seepage to be low
enough to provide time for basket cleaning only.
Shut Down
Tightly close pipeline valve on inlet and outlet connections
of the strainer. Open vents, (see
figure 3), to relieve liquid pressure in the strainer.
CAUTION: DO NOT loosen body covers
while there is liquid or air flow from the
vent.
Switching Flow
Without Equalizer
Turn lifting handle counterclockwise to lift valve plug
and position turning handle (to extreme travel position)
over clean basket. Seat valve plug slightly by turning
lifting handle clockwise.
With Equalizer
Open pressure equalizer valve and turn lifting handle
counterclockwise to lift valve plug.
Position turning handle (to extreme travel posi- tion) over
clean basket and seat valve plug tightly by turning lifting
handle clockwise.
Close equalizer valves.
Basket Removal (Yoke Cover)
Transfer flow from dirty to clean chamber (see Switching
Flow) and open vents, and/or drain valve to relieve liquid
pressure in dirty chamber.
When pressure is relieved, loosen, but do not remove, T-
bolt. Then drain fluid away through the chamber drain
connection to a level below the basket seat. This
prevents by-pass of dirty fluids.
Swing yoke away from body yoke stud and clear of body
cover. Remove cover.
Remove dirty basket.
