Infloor Autofill and Backflow 31070, 31071 - Manual

Pre-adjustable filling units
& backflow preventer
Part # 31070 - 31071
cert. n° 0003
ISO 9001
01061/04 NA
Function
The automatic filling unit is a device consisting of a pressure
reducing valve with compensating seat, an inlet filter, a shut-off
valve and a check valve.
It is installed on the water inlet piping in sealed heating systems,
and its main function is to maintain the pressure of the system
stable at a set value, automatically filling up with water as required.
This product has the characteristic of being pre-adjustable,
which means that it can be adjusted at the required pressure
value before the system charging phase.
After installation, during the filling or topping-off phase, the water
feed will stop when the set pressure is reached.
A pre-assembled version is also available, complete with upstream
backflow preventer.
C US
ASSE 1012
Product range
Code 31071 Filling unit with pressure gauge and pressure setting indicator Size 1/2”
Code 31070 Charging unit complete with backflow preventer series Size 1/2”
Technical specification
Filling unit
Material: Body: brass
Cover: PA 66 GF 30
Seals: NBR
Maximum Working Pressure: 230 psi (16 bar) Pressure
setting range: 3÷60 psi (0.2÷4 bar) Factory setting:
15 psi (1.035 bar)
Indicator accuracy: ±2 psi (±0.15 bar) Maximum
Working Temperature: 150°F (65°C)
Connection: Inlet: 1/2” NPT Male with union tailpiece
Outlet: 1/2” NPT Female
Backflow preventer
Material: Body: brass
Check valve: PSU
Check valve stem: brass
Diaphragm: EPDM
Seals: EPDM
Maximum working pressure: 175 psi (12 bar) Maximum
working temperature: 210°F (99°C) Medium: water
Certified to: CSA B64.3 and ASSE 1012
Connections: 1/2”-3/4” NPT female with union