Product Overview
Velocity (f/s) 4 6 8 10
Flow (gpm) 8 14 20 24
Pressure drop (psi) 8 13 17 21
System pressure setting
Pre-adjustment
AutoFill
™
automatic filling
valves in the 5350 series
come standard with an
operating adjustment knob
and an integral downstream
outlet pressure gauge. This
adjustment knob features
rotational operation. The
pressure can be adjusted
continuously, resulting in 7 psi
per revolution, with the value
displayed on the outlet gauge.
Compensated seat
The Caleffi AutoFill
™
5350
series automatic filling valve is
designed with compensated
seats. This means the set
pressure value remains
constant, regardless of
variations in inlet pressure. In
the figure, the thrust towards
the opening is counterbalanced
by the force created by the
closing pressure acting on the
compensating piston. Since
the piston surface area is equal
to the valve opening, the two
forces cancel out each other.
High flow fast filling
The Caleffi AutoFill
™
5350 series automatic filling valve has large internal
fluid passages allowing high flow filling with minimum pressure drop
through the valve body. The table below shows flow rates with the
corresponding pressure drop at different flow rates.
Non-sticking materials
The central support assembly (1), containing the moving parts, is
made of plastic material with a low adherence coefficient. This solution
reduces lime scale formation which is the main cause of failure.
Low head loss
The internal fluid-dynamic shape of the automatic filling valve results in
low pressure losses.
High pressures
The zone exposed to inlet pressure is constructed to operate under
high pressure. The PTFE anti-extrusion rings (2) on the compensating
piston allow it to be used continuously at 365 psi (25 bar) maximum
inlet pressure.
2
1
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0
60
20
40
80
100
0
1
2
5
6
7
3 4
psi
bar
0
60
20
40
80
100
0
1
2
5
6
7
3 4
p
s
i
bar
1
2
2
1
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0
60
20
40
80
100
0
1
2
5
6
7
3 4
psi
bar
0
60
20
40
80
100
0
1
2
5
6
7
3 4
p
s
i
bar
2
1
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0
60
20
40
80
100
0
1
2
5
6
7
3 4
psi
bar
0
60
20
40
80
100
0
1
2
5
6
7
3 4
p
s
i
bar
Removable self-contained cartridge
The cartridge, replacement code 535004, containing the diaphragm,
strainer, seat, valve port andcompensating piston, is pre-assembled
as a “self-contained unit” with a cover and can be easily removed for
inspection and maintenanceprocedures, or replacement if necessary.
Pressure gauge
The pressure gauge, replacement code NA10273,
comes standard in the AutoFill
™
5350 series automatic
filling valve and has a 1/8" NPT male connection with a
2" dial and 0–100 psi (0–7 bar) pressure range.