Product Overview
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Siemens Modulating pilot valve, PN 32 CA2N4731en
Building Technologies 09.06.2010
Type summary
Product number k
vs
Δp
max
[m
3
/h] [MPa]
M2FP03GX
0.3 1.8
∆p
max
= Maximum permissible differential pressure across the valve’s control path 1 3 valid for
the entire actuating range
k
vs
= Nominal flow rate of cold water through the fully open valve (H
100
) by a differential pressure
of 100 kPa (1 bar), to VDI 2173
Product number Operating voltage Positioning signal Working range Data sheet
ZM101/A AC 24 V DC 0…10 V DC 4…8 V
ZM121/A AC 24 V DC 4…20 mA DC 8…16 mA
ZM111 DC 0…20 V Phs DC 10…15 V Phs
N4591
For the ZM101/A and ZM121/A types also the DC 0…20 V Phs positioning signal is possible without
operating voltage.
The M2FP03GX pilot valve and the ZM.. or ZM../A terminal housing must be ordered
separately.
When placing an order, please specify the quantity, product description and type code.
Pilot valve and terminal housings are packed separately.
Technical and mechanical design
The armature or magnetic core is designed as a floating component within the
pressure system, so that no external shaft gland is required. The leakage losses
common with moving parts are thus avoided.
The control signal is converted in the ZM.../A terminal housing into a phase cut
signal, which generates a magnetic field in the coil. This causes the only moving
part, the armature, to change its position in accordance with the interacting forces
(magnetic field, counter-spring, hydraulics etc.). The armature responds rapidly to
any change in signal, transferring the corresponding movement directly to the con-
trol disc, enabling fast changes in load to be corrected quickly and accurately.
The force of the counter-spring automatically retracts the valve stem if the power is
switched off or fails (valve control path closes).
Application examples
The diagrams shown here are principles only, without installation-specific details.
Screw-in valve application such as Danfoss PM.. main valve.
Accessories / terminal
housing ZM..
Ordering
Product number Stock number Description
M2FP03GX M2FP03GX Pilot valve
ZM101/A ZM101/A Terminal housing
Delivery
Suction throttle control