Data Sheet for Product

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Siem ens Modulating control valves with magnetic actuator‚ PN 16 CA1N4465en
Building Technologies 2018-02-05
Type summary
Type reference DN Connection k
VS
Χp
max
Χp
S
Operating
voltage
Positioning Spring
return
function[inch] [m
3
/h] [kPa] [kPa]
signal time
MXG461S15-1.5
15 G 1B 1.5
300 300 AC / DC 24 V
DC 0...10 V
or
DC 2...10 V
or
DC 4...20 mA
<2 s 
MXG461S20-5.0
20 G 1¼B 5.0
MXG461S25-8.0
25 G 1½B 8.0
MXG461S32-12
32 G 2B 12
DN = Nominal size.
k
vs
= Nominal flow rate of cold water (5 to 30 °C) through the fully opened valve (H
100
) at a differential
pressure of 100 kPa (1 bar).
Χp
max
= Maximum permissible differential pressure across the valve’s control path, valid for the entire
actuating range of the motorized valve (mixing: path A-AB, B-AB)
Χp
s
= Maximum permissible differential pressure at which the motorized valve will close securely against
the pressure (close off pressure).
Type reference Description
SEZ91.6 External interface for DC 0…20 V phase cut control signal, refer to data sheet N5143
Valve body and magnetic actuator form one assembly and cannot be separated.
When placing an order, please specify the quantity, product description and type code.
Type reference Stock number Description Quantity
MXG461S25-8.0 MXG461S25-8.0 Modulating control valve with magnetic actuator 2
A CrNi-Stahl seal disc with 3 gaskets is part of the delivery.
Union fittings must be supplied by the installer.
Overview table, see page 12.
Should the valve electronics prove faulty, the electronics module must be replaced by the
ASE1 replacement electronics module. Mounting instruction no. 35678 is included.
Technical and mechanical design
For a detailed description of operation, refer to data sheet CA1N4028E.
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 in
accordance with the interacting forces (magnetic field, counter spring, hydraulics). The
armature responds rapidly to any change in signal, transferring the corresponding
movement directly to the valve plug, enabling fast changes in load to be corrected quickly
and accurately.
The valve’s position is measured continuously (inductive). The internal positioning
controller balances any disturbance in the system rapidly and delivers the position
feedback signal. The valve stroke is proportional to the positioning signal.
The magnetic actuator can be driven by a Siemens controller or a controller of other
manufacture that deliver a DC 0...10 V, DC 2...10 V or DC 4…20 mA output signal.
To achieve optimum control performance, it is recommended to use a 4-wire connection.
If the positioning signal is interrupted, or in the event of a power failure, the valve’s return
spring will automatically close control path A ↑ AB.
Accessory
Ordering
Example:
Delivery
Rev. no.
Replacement
electronics module
ASE1
Control operation
Control
Spring return function