Data Sheet for Product

2/8
Smart Infrastructure Electromotoric Actuators CA1N4863en
2021-07-16
Type summary
Type
Operating voltage
Positioning time
Positioning signal
Connecting cable
SFA21/18
AC 230 V
10 s 2-position 1.8 m
SFA71/18
AC 24 V
Type
Description
Switching point
Switching capacity
Connecting cable
ASC2.1/18
Auxiliary switch
at approx. 50 % stroke
AC 250 V / 3(2) A
1.8 m
When ordering please specify the quantity, product name and type code.
2 electric actuators, type SFA71/18 and
2 auxiliary switches, type ASC2.1/18
Actuators, valves and accessories are supplied separately.
Equipment combinations
Type reference Valve type k
vs
[m
3
/h]
PN class DN Data
sheet
VVI46..
2-port valves, internal thread Rp
2.0…5.0 PN16 15…25 N4842
VXI46..
1)
3-port valves, internal thread Rp
1)
3-port valve with tight bypass order separately: VXI46.25T with SFA.. electromotoric actuator, for
details see datasheet N4842
k
vs
= Nominal flow rate of cold water (5…30 °C) through the fully open valve (H
100
) by a differential pressure
of 100 kPa (1 bar)
Type
Compatible thermostats for SFA21/18 and SFA71/18
RAA..
RAA10; RAA20; RAB30..; RAA40
RAB..
RAB10; RAB10.1; RAB20; RAB20.1; RAB30; RAB30.1; RAB40.1
RCC..
RCC10; RCC20; RCC20.1; RCC30
RDX..
RDX42.2
RDF..
RDF10; RDF10.1; RDF10.2; RDF20; RDF30, RDF110, RDF210
RDE..
RDE10; RDE10.1; RDE20.1
RDD..
RDD10; RDD10.1
RCU..
RCU10; RCU10.1
Technical design / mechanical design
The electric actuator requires an on/off controller (thermostat) to control the valve. If the
temperature of the medium deviates from the setpoint, the controller output signal
causes the actuator to drive the valve open. When the temperature of the medium
reaches the setpoint, the control signal is cut off and the valve closes again.
The valve is opened electrically by the actuator and closed by spring force.
It incorporates a synchronous motor, a gear mechanism and a return spring.
The electric motor is overload-resistant and anti-locking, so that continuous operation is
possible. The maximum stroke is limited mechanically. The closing motion, by contrast,
includes an overrun for the gear mechanism. This protects the gear mechanism from
mechanical shock and increases service life.
The valve is connected by an 1.8 m cable, which is an integral part of the actuator.
Accessories
Ordering
Example
Delivery
Zone valves
Thermostats