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Self-Operated Temperature Controller
with globe valves
and without
plug balancing
 ◘ Applications:
Temperature controllers for heating installations with
control thermostats for set points from -10 to +150 °C
and valve sizes DN 15 to 50, nominal pressure PN 16
to 40 and temperatures up to 350 °C.
The valve closes when the temperature rises.
The controllers consist of a control valve without
plug balancing and a control thermostat with
temperature sensor, set point adjustment head with
excess temperature safety device, capillary tube and
operating element. They have the following special
features:
- Self-operated T-controller requiring little
maintenance and no auxiliary energy.
Tight -closing single- seated valves without plug
balancing, suitable for liquids, gases and vapors
especially for the heat exchangers water, oil and
steam.
- Valve bodies of cast iron, cast carbon steel or
stainless steel.
 Pressure Temperature Diagram
acc. to DIN 2401. ►
The operating and differential
pressures specified are determined
by the pressure temperature
diagram.
1) With extension piece
2) Without extension piece
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Figure 2: Principle of
operation |
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Control valve
1) Valve body
2) Seat
3) Plug
5) Plug stem
5.1) Spring
6) Connection flange
◘ Thermostat
7) Coupling nut for the valve
attachment
8) Operating element
9) Pin of the operating element
10) Operating metal bellows
11) Capillary tube
12) Cylinder for set-point
adjustment
13) Set-point scale
14) Spindle and pin for set-point
adjustment
15) Excess temperature safety
device
16) Coupling nut
17) Double spindle
18) Piston
19) Temperature sensor (bulb sensor)
◘ Principle of operation (Fig. 2)
The controller operates acc. to the liquid expansion
principle. The temperature sensor (19), capillary tube
(11) and operating element (8) are filled with an
expansion liquid. The temperature-dependent change
in volume of the liquid contained in the bulb sensor
moves the operating metal bellows (10) of the
operating element (8) and the plug stem (5) of the
valve via the pin (9).
The set point is indicated on the scale (13) and can be
adjusted by turning the cylinder (12). Thus the base
of the top and bottom guided piston (18) is moved
via the threaded spindle (14). The corresponding
change in volume is transmitted to the operating
bellows (10) and the plug stem (5) of the valve.
The position of the plug stem (5) with the attached
plug (3) and hence the free area between the valve
plug (3) and the seat ring (2) control the rate of flow.
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