T 2171 EN
Type 43-1 and Type 43-2 Temperature Regulators
Series 43 Self-operated Temperature Regulators

Application
Regulators for district heating systems, heat generators, heat exchangers and other HVAC and industrial applications.
Temperature set points from 0 to 150 °C · Valves G ½ to 1 · DN 15 to 50 · Pressure rating PN 25 · Suitable for liquids up to150 °C and non-flammable gases up to 80 °C · The valves close as the temperature rises
Note
Typetested temperature regulators (TR), safety temperature monitors (STM) and safety temperature limiters (STL) are available.

Special features• Low-maintenance proportional regulators requiring noauxiliary energy• Temperature sensor suitable for installation in any desired
position and for operation at high excess temperatures(50 K above the set point), designed for operating pressures up to 40 bar (u EB 2430)• Globe valves with plug balanced by a piston• Particularly suitable for district heating supply networks• Suitable for gases and liquids• Special version: fast-responding thermostats for instantaneous water heater (u EB 2430-3)
Versions (Fig. 1 to Fig. 3)

Fig. 1: Type 43-2 TemperatureRegulator

Fig. 2: Type 43-2 Temperature
Regulator with flangedvalve body made ofspheroidal graphite
iron, DN 40 (specialversion)

With body made red brass CC499K

With body of stainless steel 1.4408

The regulators consist of a valve and control thermostat withset point adjuster, a capillary tube and temperature sensor operating according to the adsorption principle. Valve bodymade of red brass, spheroidal graphite iron or stainless steel.
See Data Sheet u T 2176 for versions with double adapter ormanual adjuster for the attachment of additional control thermostats–Type 43-1 · Temperature regulator with Type 2431
Valve · G ½ to G 1 female thread · Type 2430 ControlThermostat · Sensor optionally with or without thermowell–Type 43-2 · Temperature regulator with Type 2432
Valve · DN 15 to 50 · With welding ends (special version
with threaded ends, flanges or with flanged body) ·Type 2430 Control Thermostat · Sensor optionally with orwithout thermowell

Typetested safety devices
The register number is available on request. The following versions are available:
Type 43-1 and Type 43-2 Temperature Regulators (TR) for
which the maximum operating pressure must not exceed theFig. 3: Type 43-1 Temperature Regulator

maximum permissible differential pressure Δp specified in thetechnical data. Only SAMSON thermowells can be used forsensors with thermowells.

SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 · samson@samsongroup.com · www.samsongroup.com

Edition December 2017

Further details on the selection application of typetested
equipment can be found in Information Sheet u T 2181.
Additionally, the safety temperature monitors (STM) and safety temperature limiters (STL) are available. For more details refer to Data Sheets u T 2183 and u T 2185.

Type 43-2

Type 43-1

Type 2432 Valve

Type 2431 Valve

Screw fitting

Female thread

Accessories– Thermowell made of:Copper, PN 40
CrNiMo steel, PN 40–

Double adapter Do3 or manual adjuster Ba43–

Intermediate insulating piece for insulated pipes or medium temperatures down to –15 °C

Special versions– 5 m capillary tube
–Small KVS in DN 15 or G ½–

Oil-resistant internal parts–

Fast-response thermostats (u EB 2430-3) on request–

ANSI version (u T 2175)–

Stainless steel body for Type 43-1/G ½, G ¾ and G 1,
DN 15 and 25–

Flanged valve body of EN-GJS-400-18-LT for Type 43-2
(DIN only)

Principle of operation (Fig. 4)

Type 43-1 and Type 43-2 Temperature Regulators

The temperature regulators work according to the adsorption
principle.

The principle of operation of Type 2432 Valve (left) andType 2431 Valve (right) is identical.

The temperature of the medium creates a pressure in the sensor which is proportional to the measured temperature. Thispressure is transferred through a capillary tube (11) to the operating element (9) and converted into a positioning force.
Depending on the set point adjustment, the positioning force
acts on the valve plug (3) over the pin of the operating element (10).

12

By turning the set point adjuster (8), the point of response ischanged in such a way that allows the valve plug to passthrough its travel in a temperature range measured by thesensor.
The regulators are suitable for plants to be heated. The valvesclose when the temperature rises and the temperature exceeds
the adjusted set point.
Installation
ValvesInstall the regulators in horizontal pipelines. The control thermostat must be suspended to hang downward. Other mounting positions are possible for temperatures up to 110 °C.
The regulator in valve sizes DN 15 to 25 can also be installedin vertical pipes. The ambient temperature at the site of installation must be at least 15 K below the adjusted set point at theset point adjuster of thermostat.
Installation conditions:–The direction of flow must match the direction indicated by
the arrow on the body–

If possible, install a strainer (e.g. SAMSON Type 1 NI) upstream of the valve.

–

Further details can be found in u EB 2171.

235
4Type 43-2 · Flanged body made of spheroidal graphite iron(special version)

1Valve body8

Set point adjuster

2Seat (exchangeable)

9

Operating element

3

Valve plug

10 Pin of operating element

4

Plug stem

11 Capillary tube to sensor

5Valve spring7

Set point spring(s)12Coupling nut (connectionvalve/control thermostat)Fig. 4: Functional diagram of Type 43-1 and Type 43-2T 2171 EN

Table 1: Technical data · All pressures in bar (gauge)
Type 2431 Valve (Type 43-1) · Type 2432 Valve (Type 43-2)
Type 43-1

G½G¾G1KVS coefficient

3.6

5.7

7.2

DN 15 4) 5)

DN 20 5)

DN 25 4) 5)

DN 32 5)

DN 40 5)

DN 50 5)

4.0 1)

6.3

8.0

12.5

16.0

20.0

Type 43-2
KVS coefficient

1)—

Type 43-1 · Type 43-2

PN 25Pressure rating

20 barMax. perm. differential pressure Δp12 bar
150 °C

Max. permissible valve temperature
Type 2430 Control Thermostat
Set point range 2)

Continuously adjustable: 0 to 35 °C, 25 to 70 °C, 40 to 100 °C, 50 to 120 °C or 70 to150 °C

Capillary tube

2 m (5 m as special version)Max. perm. temperature at the sensor

50 K above the adjusted set point

Permissible ambient temperature range–20 to 80 °C 3)

Permissible pressure at sensor/thermowell

PN 25/PN 401)

Special version with KVS 0.4, 1.0 or 2.5

2)

Further set point ranges on request

3)

Caution! At temperatures below freezing: ice formation may damage the plant and especially the valve.

4)

Flanged body of stainless steel (special version)

5)

Flanged body of spheroidal graphite iron (special version)

Table 2: Materials · Material numbers according to DIN ENBody

CC491K/CC499K (Rg 5) · EN-GJS-400-18-LT 1)

Stainless steel 1.4408 2)

Valve seat

Stainless steel 1.4305

1.4404

Valve plug1.4305 and brass, resistant to dezincification, withEPDM soft seal 3)

1.4404

Valve spring

Stainless steel 1.4310

Set point adjuster
Temperature
sensor

PTFE, glass fiber reinforced
Capillary tube

Copper

Thermowell

Copper or stainless steel1)

Special version as flanged valve (Type 43-2) · DIN only2)

Special version for Type 43-1 as well as flanged valve (Type 43-2)

3)Special version for oils (ASTM I, II, III): FKM soft seal

Capillary tube
The capillary tube must be run in such a way that the ambient
temperature range cannot be exceeded, any deviations intemperature cannot occur and that the tube cannot be damaged. The smallest permissible bending radius is 50 mm.

Flow rate diagram for waterQ
100m3hKvs

5020167.2
12.5
8 6.3
5.7 4

Temperature sensor

20The temperature sensor can be installed in any position as required. However, make sure its entire length is immersed in
the process medium to be controlled. It must be installed in alocation where overheating or considerable idling times cannot occur.

101

1

Only the combination of the same kind of materials is permitted, e.g. a stainless steel heat exchanger with thermowells
made of stainless steel 1.4571.

0.5

0.4

3.6
2.5
20.2
0.1
0.01

∆p0.05 0.1

0.5

15

1020 [bar]Fig. 5: Flow rate diagram for water

T 2171 EN3

Dimensions
L3G½(G¾)

Rd30(55)

L1LL
185(220)185(220)180(230)

H2H2SWSW

H1H1
Ø12(19)Bulb sensor with
ThermowellPacking

Ø16/220 mm:
Version as air sensor

Type 43-1

Ø9.5(16)

Type 43-2 · Version with welding ends

L3

L2

Type 43-2 · Special version withflanged body (spheroidal graphiteiron)
L3

L

H2H2A
SW

SW
With threaded ends

H1

H1

With screw-on flanges

Type 43-2 · End connections

Type 43-1 · Special version withstainless steel bodyFig. 6: Dimensional drawings · Values in parentheses for DN 32 to 50

Type 43-2 · Special version withflanged body (stainless steel)Table 3: Dimensions in mm and weights in kg
Type 43-1 Temperature Regulator
Connection

G½G¾G1

Length L

6575

90

Height H1

180

Height H230 · 46 4)—Weight 1), approx. kg

1.4

1.5

1.6

Width across flats SW

3434

46Valve size

DN 15

DN 20

DN 25

DN 32

DN 40

Pipe Ø d

21.3

26.8

32.7

42.0

48.0

60.0

Thread size R

G¾

G1G 1¼G 1¾G2G 2½

Width across flats SW

3036

46596582Length L657075

100110130Type 43-2 Temperature Regulator

Height H1
Height H2

DN 15 to 25

DN 50

180

DN 32 to 50

230

DN 15 to 2530 · 46 4)

DN 32 to 50

55 · 46 4)

L1 with welding ends

210

234244

268

294

330

Weight 1), approx. kg

1.7

2.0

2.3

4.4

5.1

5.9

Connection nuts with threaded ends
Length L2

129

144

159

180

196

228

Male thread A

G½

G¾

G1

G 1¼

G 1½

G2

Weight 1), approx. kg

1.7

2.0

2.3

4.4

5.1

5.9

With connection nuts and flanges 2) (PN 16/25)Length L3

130150160

180200230

Weight 1), approx. kg

3.1

4.0

4.8

7.6

9.1/9.8 3)

11.0/14.1 3)

1)

Version without thermowell: minus 0.2 kg

3)Flanged body2)

Valve also with flanged body4)

Flanged valve body of stainless steel 1.4408

4T 2171 EN

Special version: vapor pressure thermostats

Sensor 1)

Fast-responding temperature regulators

Hot water

Application
The temperature sensors operating according to the vapor
pressure principle are particularly suitable for use in plate
heat exchangers 1) due to the fast response time of approx.
3 s.

Type 43-1 and Type 43-2
Temperature Regulators

Temperature set points from 45 to 65 °C (55 to 75 °C) 2) ·Type 2430 Control Thermostat in combination with Type 2431
Valve (Type 43-1) or Type 2432 Valve (Type 43-2) · G ½ toG 1 · DN 15 to DN 50 · Pressure rating PN 25 · Copper orCrNiMo steel sensor · Observe mounting position of the sensor.
1)

Versions for plate heat exchangers on request

2)

Special version

Cold waterFig. 7: Thermostat (vapor pressure) installed in a coaxial heat exchanger (installation example)1)

See Fig. 8

Principle of operation

185170Ø10Types 43-1 and 43-2 Temperature Regulators with a sensor
operating according to the vapor pressure principle.
The temperature sensor is partly filled with a liquid which
evaporates depending on the temperature. As a result, a pressure in proportion to the temperature is created in the sensor.
This pressure is transmitted to the operating bellows throughthe capillary tube and converted into a positioning force. This
force moves the valve plug depending on the set point adjustment.

Type 2430 Thermostat (vapor pressure) · 45 to 65 °C · Copper
Configuration ID: 1045853, 1067861, 1045883, 1072710

Ø12170Installation

Type 2430 Thermostat (vapor pressure) · 45 to 65 °C · CrNiMo steel

To fully use the fast response behavior of the sensor (vaporpressure), the sensor must also be installed at the best possible
location. In instantaneous water heater, this location is directly
upstream of the outlet where the heated water flows out of theheat exchanger and upstream of the inlet where the hot waterflows into the heat exchanger (see Fig. 7).
–Configuration ID: 1058730, 1109125

Fig. 8: Dimensions

The ambient temperature must be at least 15 K below theadjusted set point at the set point adjuster of thermostat.

–

The mounting position of the sensor depends on the version (see Table 4).

–

Only combine the same kind of materials, e.g. stainlesssteel heat exchanger with stainless steel thermowell.

–

Installation only without thermowell.

Table 4: Mounting position and materials
Type 2430 Thermostats (vapor pressure) · 45 to 65 °C
Configuration ID

Plate heatexchanger 1)

1058730

1109125

Sensor mounting
position

Horizontal•

Tip pointing down–

Tip pointing up–

Sensor material

CrNiMo steel•Sensor connection, screw gland

G½

Without

Capillary tube length2m

Configuration ID

Shell-and-tube or
coaxial heatexchangers

1)

Sensor mounting
position

Sensor material

Horizontal

1045853

10678611045883

1072710••••

Tip pointing down––••

Tip pointing up••––Copper

•

–

•

–

CrNiMo steel

–

•

–

•

Sensor connection, screw gland

G½

Capillary tube length2mType 43-8, with instantaneous plate heat exchangersT 2171 EN5

Ordering text
Type 43-1 Temperature Regulator
G…
Set point range ...°C
Stainless steel or red brass body
Optionally, special version
Optionally, accessories ...
Type 43-2 Temperature Regulator
DN …
with welding ends, threaded ends or with flanged bodySet point range ...°C
Optionally, special version

Specifications subject to change without notice

T 2171 EN

2021-11-01 · English

Optionally, accessories ...