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Dimensions Construction details
Pre-calibration
The AutoFill
™
features a pressure
setting indicator as shown. Before
filling the system, use a
screwdriver to turn dial to the
intended system pressure. A
downstream pressure gauge is
not required.
Anti-scale materials
The central housing containing
the moving parts and the internal
compensating spindle are made of
a low adhesion coefficient plastic.
This material minimizes the risk of
formation of scale deposits, the main
cause of malfunctions.
Diaphragm-seat seal
The useful
working surface
of the diaphragm
is particularly
large, in order to
maintain stable
pressure in a system at a preset value
regardless ofinlet pressure variations.
This feature is also useful in that it gives
greater power to the sliding of the
spindle and overcomes friction. Due to
the low flow rates, the AutoFill
™
seat
has been designed with the smallest
possible diameter. This guarantees
greater precision and sensitivity to
maintain its operating characteristics unchanged over time.
Spindle guide
In order to reduce
the frictional
surfaces, the spindle
unit guide has been
positioned in the
upper part of the
device. It consists of
four spokes formed directly on the plastic central support.
Removable filter
cartridge
The cartridge containing
the operating mechanisms,
protected by a large surface
area strainer, is removable.
This permits easy and quick
inspections, internal cleaning
and cartridge replacement.
Fast filling
The AutoFill
™
fast fills the
system to set
pressure, up
to 5-1/2 gpm
filling rate, then
automatically
shuts offthe
water feed.
Code A
A
B C D
553542A
1
⁄2" NPT
1
⁄2" NPT 4
13
⁄16" 1
15
⁄16" 4"
553549A
1
⁄2" SWT
1
⁄2" NPT 4
13
⁄16" 1
15
⁄16" 4"
Code A
A
B C D
573403A
1
⁄2" NPT
1
⁄2" NPT
1
⁄2" 4
3
⁄4" 1
3
⁄8"
573503A
3
⁄4" NPT
3
⁄4" NPT
1
⁄2" 4
5
⁄8" 1
3
⁄8"
573409A
1
⁄2" SWT
1
⁄2" SWT
1
⁄2" 4
5
⁄8" 1
3
⁄8"
573493A
1
⁄2" SWT
1
⁄2" NPT
1
⁄2" 4
11
⁄16" 1
3
⁄8"
Code A
A
B C D D
573002A
1
⁄2" NPT
1
⁄2" NPT
1
⁄2" 9
3
⁄16" 1
3
⁄8" 4"
573009A
1
⁄2" SWT
1
⁄2" NPT
1
⁄2" 9
1
⁄8" 1
3
⁄8" 4"