Technical Instructions MXG461 Series Modulating Control Valve
Document Number 125-4461 with Magnetic Actuator
May 3, 2006
Page 2 Siemens Building Technologies, Inc.
Table 1. Product Numbers.
Wire Gauge (AWG)
Line Size Cv
Δp
s
Δp
v
max
S
NA
Pmed I
N
16 14 12
Product
Number
(in) (psi) (psi) (VA) (W) Fuse L (ft)
MXG461B15-0.6 1/2 0.7 145 70 33 15 3.15 130 215 360
MXG461B15-1.5 1/2 1.8 145 70 33 15 3.15 130 215 360
MXG461B15-3 1/2 3.5 145 70 33 15 3.15 130 215 360
MXG461B20-5 3/4 5.8 116 70 33 15 3.15 130 215 360
MXG461B25-8 1 9.3 102 40 33 15 3.15 130 215 360
MXG461B32-12 1-1/4 14 87 40 43 20 4 100 165 260
MXG461B40-20 1-1/2 23 87 40 43 20 4 100 165 260
MXG461B50-30 2 35 87 40 65 22 6.3 65 100 185
Key:
Δp
v
max = Maximum permissible differential pressure across the valve's control path,
valid for the entire actuating range of the motorized valve (maximum
recommended operating differential pressure).
Δp
s
= Maximum permissible differential pressure at which the motorized valve will
close securely against the pressure (close-off pressure).
S
NA
= Nominal apparent power for selecting the transformer.
Pmed = Average true power.
I
N
= Slow fuse (mandatory).
Cv = Nominal flow rate of cold water [41°F to 86°F (5°C to 30°C)].
L = Maximum cable length. With four-wire connections the maximum
permissible length of the separate 14 AWG Cu signal cable is 656 feet
(200 m).
Ordering
•
•
•
•
The valve body and magnetic actuator assemblies cannot be separated.
The brass/bronze fittings are included.
The Z366 stem heater must be ordered separately.
When placing an order, specify the quantity, product number and description.
Example:
1 MXG461B15-0.6 valve and 1 Z366 stem heater
Accessories
Z366 Stem heater for 24 Vac/10W.
Required for medium temperatures
<32°F (0°C).
ASE12 Replacement Circuit Board
SVAL0229R1
Figure 1.
Technical/
Mechanical Design
Automatic Control
The electronics module converts the positioning signal to a phase-cut power signal,
which generates a magnetic field in the coil. This causes the armature to change its
position according to the interacting forces (magnetic field, counterspring, hydraulics,
etc.). The armature responds rapidly to any change in signal, transferring the
corresponding movement directly to the valve plug. This enables fast changes in load to
be corrected quickly and accurately.
The valve’s position is measured continuously. Any disturbance in the system is rapidly
corrected by the internal positioning controller, which ensures that the positioning signal
and the valve stroke are exactly proportional, and also delivers the position feedback
signal.
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