T 2172 EN
Type 43-5 and Type 43-7 Self-operated Temperature Regulators (for heating)Type 43-6 Self-operated Temperature Regulator (for cooling)

Application
Temperature set points from 0 to 150 °C · Valves G ½ to G 1 · DN 15 to 50 · Pressure rating PN 25 · Suitable forliquids and steam up to 200 °C and non-flammable gases up to 80 °C · For plants to be heated or cooled.
Note
Typetested temperature regulators (TR), safety temperature monitors (STM) and safety temperature limiters (STL) areavailable.

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 bellows•• Compact design with particularly low overall height•• Suitable for liquids, gases or vapors.
Versions (Fig. 1 to Fig. 4)
The regulators consist of a globe valve and control thermostat
with set point adjuster, a capillary tube and temperature sensor operating according to the adsorption principle. Valve
body made of red brass, spheroidal graphite iron or stainlesssteel.
See Data Sheet u T 2176 for versions with double adapter ormanual adjuster for the attachment of additional control thermostats

Fig. 1: Type 43-5
Temperature
Regulator

Fig. 2: Type 43-6 Temperature
Regulator with female
threadFig. 3: Type 43-7 Temperature
Regulator with malethreadFig. 4: Type 43-7 Temperature
Regulator with flanged
body of spheroidal
graphite iron

Temperature regulators with Type 2430 Control Thermostatand valve with G ½, G ¾ or G 1 female thread–– Type 43-5 · For plants to be heated · Type 2435 Valve for
PN 25 · Suitable for liquids and steam up to 200 °C–– Type 43-6 · For plants to be cooled · Type 2436 Valve for
PN 25 · Suitable for gases up to 80 °C and liquids up to150 °C
Temperature regulators with Type 2430 Control Thermostatand valve in DN 15 to 50 with welding ends, threaded ends
or flanged valve body–– Type 43-6 · For plants to be cooled · Type 2436 Valve for
PN 25 · Valve size DN 32 to 50 · Suitable for gases up to80 °C and liquids up to 150 °C–– Type 43-7 · For plants to be heated · Type 2437 Valve for
PN 25 · Valve size DN 15 to 50 · Suitable for liquids andsteam up to 200 °C

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

Edition October 2019

Typetested safety devices

Installation

The register number is available on request. The following
versions are available:

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.

Type 43-5 and Type 43-7 Temperature Regulators (TR) for
which the maximum operating pressure must not exceed themaximum permissible differential pressure Δp specified in thetechnical data. Only SAMSON thermowells can be used forsensors with thermowells.
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.
Accessories–– Thermowell made of:
Copper, PN 40
CrNiMo steel, PN 40–– Double adapter Do3 or manual adjuster

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.
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.
Capillary tube–– Small KVS in DN 15 or G ½

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.

–– Oil-resistant internal parts (Type 43-6)

Temperature sensor

Special versions–– 5 m capillary tube–– ANSI version (u T 2174)–– Stainless steel body for Type 43-6 · G ½ to G 1, DN 15
and 25–– Flanged valve body of EN-GJS-400-18-LT for Type 43-6
and Type 43-7

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

Principle of operation (Fig. 6)
The temperature regulators work according to the adsorption
principle.
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).
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 valves are balanced by the metal bellows (6). The balancing bellows counterbalances any changes in pressure upstream of the valve since the upstream pressure also acts on
the inside of the bellows through a hole in the valve plug (3).
The Type 43-5 and Type 43-7 Regulators are suitable forplants to be heated. The valves close when the temperaturerises.
The Type 43-6 Regulator has a valve which opens as the temperature rises. This regulator is therefore suitable for plants tobe cooled.

2

Flow rate diagram for waterQ
100

m³hKvs50
20167.2
12.5
8 6.3
5.7 4

20103.6
2.5
2
1

10.50.4

0.2
0.1
0.01

∆p0.05 0.1

0.5

1

5

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

T 2172 EN

Type 2437 Valve(connection nut)

Type 2435 Valve(female thread)Type 2436 Valve (female thread)

56
3

122

134

6124
1157813912

10Functional diagram of Type 43-5 and Type 43-7
(control thermostat not shown)

Functional diagram of Type 43-6

Type 2436 and Type 2437 Valve (flanged body)
1

Valve body2

Seat (exchangeable)

13

Valve plug

24

Plug stem

5

Valve spring7

Set point spring(s)8Set point adjuster

9Operating element35
4

10 Pin of operating element
11 Capillary tube to sensor
12Functional diagram of Type 43-7
(control thermostat not shown)

Coupling nut(connection valve/control thermostat)Fig. 6: Functional diagram of Type 43-5, Type 43-6 and Type 43-7 Temperature Regulators

T 2172 EN3

Table 1: Technical data · All pressures in bar (gauge)
Temperature regulator

TypeValve

43-5

43-6

43-7

2435

2436

2437

G ½ to 1–

Thread size G · Female thread
Body material

CC499K

G ½ to 11.4408–Valve size DN 5) · Male thread · Flange
DN 32 to 50

CC499K 2)
Body material

EN-GJS-400-18-LT 3)–

DN 15 to 50

DN 15 to 50
DN 15 · DN 25

1.4408 3)
Pressure rating–PN 25Perm. permissible temperature range of valve

0 to 200 °C

0 to 200 °C

0 to 150 °C 1)

Type 2430 Control Thermostat°C

Set point range 4)

0 to 35 · 25 to 70 · 40 to 100 · 50 to 120 · 70 to 150

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

Permissible pressure at sensor/thermowell

PN 25 · PN 40

With intermediate insulating piece: –15 to +150 °C with CC499K; –10 to +150 °C with EN-GJS-400-18-LT
With male thread
With flanged body
Further set point ranges on request
Standard version with welding ends (with threaded ends on request)

1)
2)
3)
4)
5)

Table 2: KVS coefficients · Max. perm. differential pressure Δp
KVS coefficients for ...
Connection size

G½¾

1

Valve size

DN15 1) 2)

20 1)

25 1) 2)

32 1)

5.0

12.5Max. perm. differential pressure Δp
KVS coefficient–16 bar3.240 1)

50 1)

8 bar

4.0

Special version

16.020.0

0.4 · 1.0 · 2.5 3)

Flanged valve body made of spheroidal graphite iron (Type 43-6 and Type 43-7)
Flanged valve body made of stainless steel (Type 43-6)
Special version on request1)
2)
3)

Table 3: Materials · Material numbers according to DIN ENBody

CC499K · EN-GJS-400-18-LT

Stainless steel 1.4408

Stainless steel 1.4104 1)

1.4408Type 43-5
Type 43-7

Brass, resistant to dezincification, CW617N (CuZn40Pb)
and 1.4104 with PTFE soft seal 3)–Type 43-6

Brass, resistant to dezincification, CW617N (CuZn40Pb)
with EPDM soft seal 2) 3)

1.4408

Valve seat

Valve plug

Balancing bellows

Stainless steel 1.4571

Valve spring

Stainless steel 1.4310

Set point adjuster
Temperature sensor

PTFE, glass fiber reinforced
Capillary tube

Copper

Thermowell

Copper or stainless steel 1.4571

Set point adjuster1)
2)
3)

4

PTFE, glass fiber reinforced

Type 43-6 in G ½ to G 1: 1.4305
Special version for oils (ASTM I, II, III): FKM soft seal
When KVS = 0.4 and 1.0: 1.4305

T 2172 EN

Dimensions
Type 43-6 · DN 15 to 50 · Version with welding ends
G½(G ¾)260

210

Ø12(Ø19)Ø12
Ø9.5(Ø19)(Ø16)
Bulb sensor withthermowell
packing

Ø9.5(Ø16 1))

Bulb sensor withthermowell
packingType 43-7 · DN 15 to 50 · Version with welding ends

Valve with flanged bodyThreaded ends

L3~95185(220)G½(G¾)

185(220)d R

260(310)30(55)

L1L

G½(G¾)

185(220)

SW190

L30

d R185(220)9546L1L185(220)LType 43-5 · G ½ to G 1

185(220)Type 43-6 · G ½ toG1HØ9.5
Ø12(Ø16)(Ø19)
Bulb sensor withthermowell
packing

Dimensions inparentheses for
DN 32 to 50

Fig. 7: Dimensions in mm1)

Ø16/220 mm: version as air sensor

T 2172 EN

5

Table 4: Dimensions in mm and weights in kg
Type 43-5
Type 43-6(G ½ to 1)

Connection

G½

G¾

G1

Length L

65

7590

Width across flats SW

343446Weight 1), 2), approx. kg

1.8

1.9

2.0

Valve size

DN 15

DN 20

DN 25Pipe Ø d21.3

26.8

Thread size R

G¾G1

Width across flats SW

3036Length L

6570

Type 43-6(DN 32 to 50)

Type 43-7(DN 15 to 50)

Height H—DN 32

DN 40

32.7

42.0

48.0

60.0

G 1¼

G 1¾

G2

G 2½

4659

65

8275

100110130Type 43-6 5)

190 3)

210 4)

Type 43-7 6)

260 3)

310 4)

DN 50

Connection nuts with welding ends
Length L1

210234244

268294330

Weight 1), 2), approx. kg

2.0

2.3

2.8

4.7

5.1

7.5

Connection nuts with threaded ends
Length L2129144159

180

196

228

Male thread A

G½G¾G1

G 1¼

G 1½

G2Weight 1), 2), approx. kg

2.0

2.3

2.8

4.7

5.1

7.5

Length L3130150160

180200230

Weight 1), 2), approx. kg

3.1

3.9

4.6

7.6

9.8

14.1

With flanged body · PN 251)
2)
3)
4)
5)
6)

Version with bulb sensor and thermowell
Version without thermowell: minus 0.2 kg
With Ø9.5 mm sensor
With Ø12 mm sensor
Without separating pieceWith separating piece

Ordering text
Type 43-5 Temperature Regulator
G…
Set point range ...°C
Optionally, special version
Optionally, accessories ...
Type 43-6 Temperature Regulator
G … orDN … with welding ends, threaded ends or with flangedbody
Stainless steel or red brass bodySet point range ...°C
Optionally, special version
Optionally, accessories ...

DN … with welding ends, threaded ends or with flangedbody
Set point range ...°C
Optionally, special version
Optionally, accessories ...

Specifications subject to change without notice

T 2172 EN

2019-10-21 · English

Type 43-7 Temperature Regulator