Data Sheet for Product

CA1N4028E / 11.1998 Siemens Building Technologies
2/12 Landis & Staefa Division
The technology in practice / Features of the valve
Fig. 3: Diagram and cross-section of a magnetic valve
Conversion from positioning signal to magnet voltage
The electrical interface (Fig. 3, k) is connected to an AC 24 V supply voltage
and to the controller output with a DC 0 ... 10 V positioning signal for the
valve. The internal phase-cut generator alters the power output of the
interface in proportion to the positioning signal. The magnetic coil is
connected to this phase-cut voltage (Fig. 4).
1 Inlet port
2 Bypass
3 Outlet port
a Magnetic coil
b Core
c Spring
d Stem
e Disc
f Upper / lower valve seats
g Bellows
h Aperture for pressure balancing
i Handwheel
k Electrical interface
Fig. 4: Conversion of the positioning signal into a magnet voltage
10
t
U
0
20
t
U
Control signal
DC 0 ... 10 V
24
t
U
0
Supply voltage
AC 24 V
Phase cut generator
Magnet voltage
DC 0 ... 20 V
t
U
t
94.0206
U
94.0226
0 ... 20 V–
I
1
3
2
a
b
d
c
f
e
1
3
2
h
g
i
k