User Guide

Product range
5350 Series AutoFill Automatic fi lling valve with pressure gauge and pressure setting adjustment
knob with NPT, Press, and Sweat connections, size 3/4”.
Technical Characteristics
.
Materials: -Body: brass
-Cover: Glass fi ber reinforced nylon PA66G30
-Control spindle: stainless steel
-Moving parts: brass
-Diaphragm & seals: NBR
-Filter: stainless steel
.
Max working pressure: 365 psi (25 bar)
.
Downstream pressure setting range: 6–90 psi (0.5 6 bar)
.
Factory setting: 15 psi (1.035 bar)
.
Max. working temperature: 140
°F (0–60°C)
.
Pressure gauge scale: 0–100 psi (0–7bar)
.
Filter mesh size: 0.51 mm (35 mesh)
- Environmental: indoor only
.
Suitable fl uids: water
.
Connections: -NPT male union: 3/4”
-Sweat union: 3/4”
-Press: 3/4"
-Lay length (press connection): 4-7/16"
-Pressure gauge: 1/8” NPT
Function
The 5350 series AutoFill™ automatic fi lling valve is a pressure reducing valve which when installed
on the water inlet piping in closed hydronic systems will maintain system pressure at a set value,
automatically fi lling up with water as required. Fast fi lls the system to set pressure then automatically
shuts off the water feed. This product is factory pre-set to 15 psi system pressure. To adjust the
set pressure, simply turn the adjustment knob while observing the integral dowmstream pressure
gauge. This product has the characteristic of being pre-adjustable, which means that it can
be adjusted at the right pressure value before the system charging phase. After installation,
the system pressure will automatically adjust itself to the set value and the water feed will stop when
the set pressure is reached. The internal cartridge containing all the controlling components is pre-
assembled as a self-contained unit, to facilitate inspection and maintenance procedures.
Installation, commissioning and servicing instructions
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CALEFFI
NA38445.01
AutoFill
™
Automatic fi lling valve
5350 Series