Xylem IM129 R01 BF03S - Manual (Page 8)

8
Figure 5
NORMAL FLOAT POSITION
WITH CORRECT AIR CUSHION
FLOAT CONTROL VALVE CLOSED.
CALIBRATED ORIFICE
AIR VALVE (2)
NORMAL WATER LEVEL
FLOAT CONTROLLED VALVE OPEN
3 ⁄
16
" O.D.
COPPER TUBING
AIR VALVE
IN PUMP CASING
VALVE STEM DEPRESSED BY
FLOAT ROD EXTENSION (1)
FLOAT IN RAISED POSITION
WATER
WATER LEVEL ABOVE
NORMAL CHAMBER NEEDS AIR.
AIR
AIR PASSES DOWN COPPER TUBE
INTO WATER PUMP THROUGH THE
AIR VALVE AND THEN INTO TANK
WITH THE WATER
VALVE ASSEMBLY
ON AIR VOLUME
CONTROL
1 ⁄
16
"
SUCTION EFFECT OF WATER PUMP
WHEN RUNNING DRAWS AIR
THROUGH OPEN VALVE HERE.
VALVE IS OPENED
BY DEPRESSING
THIS STEM.
VALVE SEAT
VALVE IS SHOWN IN
CLOSED POSITION.
CALIBRATED ORIFICE
PROCEDURE FOR REPLACING AIR VOLUME
CONTROL TUBE IF DAMAGED
Slip compression nut and sleeve over end of tube and
insert end of tube all the way in counter bore of fitting.
Then pull tube back about 1 ⁄
16
" so there is a space
between end of tube and bottom of counter bore. With
tube in this position, tighten compression nut securely.
CAUTION: Be sure tube is in line with counter bore and
nut is not cross threaded.