Design And Principle Of Operation - Samson TROVIS 5757-3 Mounting And Operating Instructions

3 Design and principle of oper-
ation
The TROVIS 5757-3 Electric Actuator with
Process Controller is an electric actuator with
an integrated digital controller. It can mount-
ed on SAMSON Types 3213, 3222,
3222 N, 2488 and 3267 Valves (DN 15 to
25) as well as special versions of Type 3260
and Type 3226 Valves.
Design
Î See Fig. 3-1 and Fig. 3-2.
The actuator is mounted onto the valve using
a coupling nut (4). When the actuator stem
extends, the globe valve is closed, opposing
Sales Flow pipe
RL Return flow pipe
WW Hot water
KW Cold water
VS Flow sensor
TW
WSS Water flow sensor
Fig. 3-1: Sample application: domestic hot water heating with Pt 1000 sensor and water flow sensor
EB 5757 EN
2
1
3
2
1 3
4
5
6
4
7
5
6

Design and principle of operation

the force of the valve spring (7). When the
actuator stem retracts, the valve is opened as
the plug stem (6) follows the motion of the
return spring.
When connected to a three-way mixing
valve, the extending actuator stem causes the
valve (A → AB) to open.
The output signal of the controller functions
as a three-step signal on the motor of the
actuator and is transferred over the
connected gear to the actuator stem (3) and
used as the stroke. The motor is switched off
by torque-dependent switches when an end
position is reached or in case the motor is
overloaded.
Heat exchanger
Temperature sensor including sensor pocket, VS
Supply from district heating network (VL)
TROVIS 5757-3 Electric Actuator with Process Controller
Water flow sensor with connecting cable
Return flow to district heating network (RL)
Valve, e.g. Type 3222
TW
3-1