172-65142M-04 (TC8) 11 Oct 2021
5
Configuration
No.
Name
1 Valve body
2 Valve seat
3 Main valve unit
4 Spring
5 Set point adjustment ring
6 Positioning bellows
7 Temperature regulator
8 Temperature sensor
9 Capillary tube
10 Sensor connecting nut
11 Union nut
The temperature regulating valve is made up of two main parts, the body of the
valve and the temperature regulating thermostat, which are connected by a union
nut.
Operating Principles
The temperature of the medium produces a pressure in the sensor (8) which is
proportional to the actual temperature measured. This pressure is transmitted
through the capillary tube (9) to the operating element in the temperature
regulator where it is converted into a positioning force. This force acts on the
positioning bellows (6) and the pin of the operating element, which in turn moves
the main valve plug stem (not labelled in this diagram).Therefore, as the
temperature rises, the valve begins to close, and conversely, as the temperature
falls the valve opens.
By turning the set point adjustment ring (5) the point of response of the regulator
is changed by the spring (4). Consequently the valve plug moves through its full
travel range within a higher or lower temperature range measured by the sensor.
