Product Overview

1
A
B
C
Application diagrams
Caleffi panel radiator valves are designed to be installed on panel
radiators featuring connections both on the bottom and an externally
invisible inner pipe, which feeds the flowing medium to the upper valve.
They come in two versions: for two-pipe and one-pipe systems. Both
are available straight (pipes exiting the floor) and angled (pipes exiting
the wall). The two-pipe version is equipped with two ball shut-off valves;
the one-pipe, in addition to the shut-off valves, is equipped with an
adjustable by-pass from 30% to 50% of the flow rate towards the
radiator, and a thermal break device (1) that prevents thermo-syphoning
upward into radiator from by-passing flow.
Since the radiators are in series in one-pipe systems, the downstream
radiator receives water at a lower temperature than the upstream
radiator. In most applications, it is recommended the number of
radiators should be limited to 3 to ensure sufficient heat delivery.
Isolation valves and diverter valves are not necessary when directly
connecting a panel radiator to manifold. Radiator adapter, code
940451, is used for direct pipe connection, PEX, PEX-AL-PEX, sweat or
compression, to the radiator.
How to adjust the by-pass on
single one-pipe valves. Range:
30–50%
The valve is supplied preset with
35% flow rate to the radiator. To
change the flow rate, shut the
by-pass valve and then unscrew
the same by a number of turns
equivalent to the required flow
rate indicated in the graph.
One-pipe plumbing
Two-pipe plumbing
Manifold piping
(A) Diverter valve (3012, 3013)
(B) Isolation valve (3010, 3011)
(C) Radiator adapter, code 940451
2 3456
25
30
35
40
45
50
55
2.5 3.5 4.5 5.5
Number of turns
Flow rate %
6mm
2 3456
25
30
35
40
45
50
55
2.5 3.5 4.5 5.5
Number of turns
Flow rate %
6mm
Code Description
449740 Plate
Code Description
940451
1
⁄2" M radiator x
3
⁄4" M conical pipe
4497
Wall-covering plate.
For dual panel radiator valves 301.
With wall connections.
In white ABS.
Outlet center distance: 40–50 mm
940
Radiator adapter for directly
connectingapanel radiator to a
manifoldwith PEX, PEX-AL-PEX,
sweator compression fittings.
Accessories