T 2170 EN
Series 43 Self-operated Temperature Regulators

PN 16/25 · Class 150/300
DN 15 to 50 · NPS ½ and 1G ½ to 1 · ½ to 1 NPT
Up to 200 °C · Up to 390 °F

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 April 2018

Series 43 Self-operated Temperature Regulators
SteamWater, liquids
OilGases, non-flammable gases 4)
HeatingCooling
Mixing/diverting
Globe valve
Three-way valveBalanced
Unbalanced
Female thread
Welding ends
Threaded ends
Flanges
Valve size
Connection size
Pressure rating
Max. permissible temperature
Hot-pressed brass
Red brassBodymaterial
Spheroidal graphite ironDIN versions
•
•

•
•
•
•

•
•

Connection

DN
GPN°C

•
•
•

•
•
•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•
•
•
•
15 to 50•••
15 to 50

½ to 1150•• 3)••• 2)½ to 125200½ to 1

••150
• 3)
• 1)
• 2)

1)

Stainless steel
Type ... Control Thermostat

Thermostat

ValveCan be used for•••••
2430

Set point°CSensor material
Thermowell0 to 35 · 25 to 70 · 40 to 100 · 50 to 120 · 70 to 150
CopperOptionally copper or stainless steel
43-1
43-2
43-5
43-6
u T 2171
u T 2172

Type
Data Sheet T …

43-6

Type 2040 Safety Temperature Monitor for cryogenic
service on request (u T 2090)
Flange DN 32 to 501)

2)

Flange DN 15 and 253)

Male thread DN 15 to 504)

Max. permissible temperature 80 °C

Control thermostats
Control thermostats and temperature sensors
The Series 43 Temperature Regulators are fitted with Type 2430 Control
Thermostats. The temperature sensors can be used for operating pressures
up to 40 bar (580 psi) and set points up to 150 °C (300 °F).
Details can be found in the corresponding data sheets.
Combined regulators
A double adapter can be attached between the valve and control
thermostat to mount further control thermostats and control equipment(u T 2176).

Control thermostat withtemperature sensor andthermowell

Temperature sensor withscrew glandFig. 1: Control thermostat with various sensor versions

Combinations with flow and differential pressure regulators are possible.
TR21011202122Control thermostat
Housing with spring mechanism
Double adapter Do3 (housing)Type 2439 Safety Temperature Limiter (STL)
Temperature sensor with thermowell

TRSTL

Temperature regulator
Safety temperature limiter (STL)

20
TR
10102222

Temperature regulator withdouble adapter Do3Temperature regulator with safety
temperature limiter (STL)

Fig. 2: Combined regulators

T 2170 EN

Series 43 Self-operated Temperature Regulators••Thermostat••••••••••••••••••••••••••
15 to 50• 1)
• 1)

••

Connection

Valve

Can be used for

SteamWater, liquids
OilGases, non-flammable gases 4)
HeatingCooling
Mixing/diverting
Globe valve
Three-way valve
Balanced
Unbalanced
Female thread
Welding ends
Threaded ends
Flanges
Valve size
Connection size
Pressure rating

DNGPN

Max. permissible temperature
Hot-pressed brass
Red brassBodymaterial
Spheroidal graphite iron
Stainless steel
Type ... Control Thermostat°C

Set point°C••••
15 to 50

15½ to 1
25200150•••

1616/25120•120 3) · 130

•

•2430
0 to 35 · 25 to 70 · 40 to 100 · 50
0 to 100
to 120 · 70 to 150
CopperOptionally copper or stainless steel
43-743-343-3 2)
43-2 Nu T 2172u T 2173
u T 2186

Sensor material
Thermowell

TypeData Sheet T …

45 to 65
CrNiMo steel
Without43-8
u T 2178

Connecting thread G ¾ B to mount welding ends and threaded ends
Version with male thread to mount welding ends, threaded ends or flanges also available as diverting valve
Max. permissible valve temperature
Max. permissible temperature 80 °C1)
2)
3)
4)

Safety thermostats
The Type 2403 Safety Thermostat for safety temperature monitor consists of a temperaturesensor without thermowell, limit adjuster, capillary tube and connecting element.
The Type 2439 Safety Thermostat for safety temperature limiters (STL) consists of a housing witha spring mechanism and thermostat with capillary tube, bulb sensor and thermowell. The device
can also be delivered with an electric signal transmitter for remote transmission of a malfunction.
Dynamic behavior of control thermostats
The dynamics of the regulator are mainly determined by the response of the sensor with its
characteristic time constant. Table 1 lists the response times of SAMSON control thermostats for
Series 43 Regulators operating according to different principles measured in water.

Type 2403 (STM)

Type 2439 (STL)

Fig. 3: Safety thermostats

Table 1: Dynamic behavior of some SAMSON control thermostats
Type of operation
Adsorption
Vapor pressure1)

DN 15 to 25

T 2170 EN

Without

Type2430

Thermowell
30 s 2)15 s 1)

With40 s 1)

80 s 2)

2439– 3)

40 s

2403

3s– 3)

2)DN 32 to 503)

Not permissible

Fig. 4: Type 2439 Safety Thermostat withelectric signal transmitter

3Series 43 Self-operated Temperature Regulators
SteamWater, liquids
OilGases, non-flammable gases 1)
HeatingCooling
Mixing/diverting
Globe valve
Three-way valve
Balanced
Unbalanced
Female thread
Welding ends
Threaded ends
Flanges
Valve size
Connection size
Pressure rating
Max. permissible temperature••••

NPSNPT
Class°F•••••••••••••••••

ConnectionValveCan be used for••••Body
Stainless steel A351 CF8MmaterialType ... Control Thermostat

Thermostat

ANSI versions

••••
½·1

½ to 1300•••½·1150½ to 1300

150

•

•300
•

•
2430

Set point°FSensor material
Thermowell

30 to 95 · 75 to 160 · 105 to 210 · 125 to 250 · 160 to 300
CopperOptionally copper or stainless steel
43-1
43-2
43-6
43-6
u T 2175u T 2174

Type
Data Sheet T …

Max. permissible temperature 176 °F1)

Area

Conversion factors

1 square inch [sq.in; in²] = 6.452 cm²

KVS and CV coefficient
The exact calculation is performed according to IEC 60534,
parts 2-1 and 2-2. The ISA-S75.01-1-1985 standard andVDI/VDE directive 2173 are also used. The calculation of theKV coefficient according to this directive is sufficiently accurate
in most cases. The equations are also listed in the Application
Notes AB 04.

1 cm² = 0.155 in²
Mass
1 pound [lb] = 0.4536 kg
1 kg = 2.2046 lb
Mass flow
1 pound per second [lb/s] = 0.4536 kg/s

KVS

=0.86 x CVKVS[m³/h]

CV=

1.17 x KVS

CV[US gallon/min]

1 kg/s = 2.2046 lb/s
Flow rate
1 US gallon per min [US gallon/min] = 0.227 m³/h
1 m³/h = 4.4 US gallon/min

Pressure
1 pound/square inch [lbs/in² = psi] = 0.06895 bar
1 bar = 14.5 psi

4Temperature°F = 9/5 °C + 32
°C = 5/9 (°F - 32)

T 2170 EN

Pressure-temperature diagrams
The pressures specified in the corresponding data sheets are maximum values which are limited by the pressure-temperature
diagram.
For DIN materials, the diagrams were created based on DIN EN 12516-1. For materials in accordance with US standards, thesewere created in compliance with ASME B16.1 and ASME B16.34.
Pressure-temperature diagram (DIN)

p1.4408[bar]

EN-JS1049, CC499K

PN

302520

1610t

0
0 20

100

150

200

250

300

350

[°C]

Pressure-temperature diagram (ANSI)

A 351 CF8M

p[bar] [psi]30 40025 360300

20Class 150

Class 300

200
10100t0 32100200038100300

400 450 500
200 232600 660
300

349

[°F]
[°C]Fig. 5: Pressure-temperature diagrams (DIN/ANSI)T 2170 EN5Principle of operation (see Fig. 6)
pending on, for example the upstream pressure, can be eliminated by balancing the plug correspondingly.

123457891011

Valve body
Valve seat(exchangeable)
PlugPlug stem
Valve springSet point spring(s)Set point adjuster
Positioning bellows
Capillary tube
Temperature sensor

The valve plug has a hole through it to allow the upstreampressure to be applied to the front and back of the plug. The
downstream pressure is separated from the plug either by thebushing of a piston plug (Fig. 7) or a metal bellows (Fig. 8).
Regulators for plants to be heated
p2

p1

35

Fig. 6: Temperature regulator

Self-operated temperature regulators are control devices
whose measuring units draw their energy from the process
medium which creates sufficient force to move the final control
element (plug with plug stem).

pt

The regulators illustrated consist of a valve (1) and a control
thermostat with set point adjuster (8), capillary tube (10) andtemperature sensor (11) operating according to the adsorption principle 1).
The medium temperature creates the pressure pt in the sensor(11) that corresponds to the actual value. This pressure istransferred over the capillary tube (10) to the positioning bellows (9) where the force Ft = pt x A is created at the effective
bellows area A. This force that corresponds to the controlled
variable x is compared at the bottom of the bellows with thespring force Fs (= set point w) dependent on the set point adjustment.

35

Plug balanced bybellows
Metal bellows

Fig. 8: Temperature regulator with plug balanced by abellows. The valve closes as the temperature rises.

The regulators (Fig. 7 and Fig. 8) are suitable for plants to beheated.
The valve closes as soon as the temperature at the sensor rises.
Regulators for plants to be cooled
5

When the temperature changes, the plug (3) moves until Ft =Fs.

p1

p2

3

Pressure balancingpt

35

Plug balanced bybellows
Metal bellows

Fig. 9: Temperature regulator with plug balanced by abellows. The valve opens as the temperature rises.
3
6

Plug balanced by apiston
Bushing

The regulators (Fig. 9) are suited for plants to be cooled.
The valve opens as soon as the temperature at the sensor rises.

Fig. 7: Temperature regulator with plug balanced by a piston. Thevalve closes as the temperature rises.

The control accuracy and stability of the control process depend on the disturbances occurring in the loop (for example,changes in upstream pressure and flow rate). The regulators
are designed in such a way that the effect of these disturbances is relatively small. The force acting on the valve plug de-61)

Special fast-responding versions available operating according to the vapor
pressure principle.

T 2170 EN

Type 43-6 Temperature Regulator
Designed for plants to be cooled. Version with plug balanced
by a bellows 1). The valve opens as the temperature rises.

Series 43 Temperature Regulators
Self-operated regulators for general applications•• Low-maintenance, medium-controlled proportional regulators requiring no auxiliary energy•• Temperature sensors suitable for all mounting positions
and high permissible ambient temperatures•• Suitable for liquids, gases and vapors at operating pressures up to 40 bar•• Particularly suitable for district heating supply networks•• Body with screwed ends and flanged bodyTechnical data

Versions with globe valve
Type 43-1 and Type 43-2 Temperature Regulators
Designed for plants to be heated. Plug balanced by a piston 1). The valve closes as the temperature rises.
Data Sheets u T 2171 · u T 2175

Set point ranges

0 to 150 °C · 30 to 300 °F

Valve size

DN 15 to 50 · NPS ½ and 1
G ½ to 1 · ½ to 1 NPT

Pressure rating

PN 25 · Class 150 · Class 300

Temperature ranges
Liquids
Non-flammable gases

Up to 150 °C · Up to 300 °F
Up to 80 °C · Up to 175 °F1)

Set point ranges

0 to 150 °C · 30 to 300 °F

Valve size

DN 15 to 50 · NPS ½ and 1G ½ to 1 · ½ to 1 NPT

Pressure rating

PN 25 · Class 150 · Class 300

Temperature ranges
Liquids and steam
Non-flammable gases

Up to 200 °C · Up to 390 °F
Up to 80 °C · Up to 175 °F

0 to 150 °C · 30 to 300 °F

Valve size

DN 15 to 50 · NPS ½ and 1
G ½ to 1 · ½ to 1 NPT

Pressure rating

PN 25 · Class 150 · Class 300

Temperature ranges
Liquids
Non-flammable gases

Up to 150 °C · Up to 300 °F
Up to 80 °C · Up to 175 °F

Designed for plants to be heated. The valve closes as the temperature rises.
Technical data

Technical data
Data Sheets u T 2172 · u T 2174

Set point ranges

Type 43-2 N Temperature Regulator•• Temperature sensors suitable for all mounting positions•• Treated water up to 120 °C at operating pressures up to16 bar•• Particularly suitable for local heat supply and large heating networks

Type 43-5 and Type 43-7 Temperature Regulators
Designed for plants to be heated. Version with plug balanced
by a bellows 1). The valve closes as the temperature rises.
Type 43–5 · Type 43-7

Data Sheets u T 2172 · u T 2174

Series 43– … N

Technical data
Type 43–1 and Type 43–2

Type 43-6

Type 43-2 N

Data Sheet u T 2186

Set point ranges
Valve size
Pressure rating
Temperature ranges
Treated water

0 to 100 °C
DN 15
PN 16
Up to 120 °C

Versions with three-way valve
Type 43-3 Temperature Regulator
Designed for mixing or diverting service in heating or coolinginstallations
Technical data

Pressure balancing is not required in the versions with reduced KVS
coefficients and small seat bores.

Type 43-2

Type 43–3Data Sheet u T 2173

Set point ranges
Valve size
Pressure rating
Temperature ranges
Water, oil

0 to 150 °C
DN 15 to 50 · G ½ to G 1
PN 10 · PN 25
Up to 150 °C

Type 43-3

Type 43-1

Type 43-6
Type 43-5 2)Type 43-2 N2)Types 43-5 and 43-7 are identical in design. The valve of Type 43-7 is designedwith connection nuts to mount threaded or welding ends (DN 15 to 50).

Fig. 10: Series 43 Temperature Regulators

T 2170 EN7

Type 43-8 and Type 43-8 N Temperature Regulator
with Hydraulic Controller
Temperature regulation of instantaneous water heaters insmall district heating units••••••••••

Regulation of small instantaneous water heaters
Compact design, easy to operate and install
Stable control already at tapped quantity of 2 l/minute
Idle temperature regulation
Fast-responding vapor pressure thermostats

Technical data
Type 43–8 · Type 43-8 N

Data Sheet u T 2178

Valve

Type 2432

Valve size
Pressure rating
KVS coefficientMax. permissible temperature

DN 15
PN 16 1) · PN 25
2.5
120 °C 1)/130 °C

Control thermostat

Type 2430

Set point ranges
Perm. pressure at sensor
Perm. temperature at the set point
adjuster

45 to 65 °C
PN 4035 °C

Hydraulic controllerType 2438

Pressure rating
Max. permissible ambienttemperature

PN 1680 °C1)

Technical data
Type 2040

Data Sheet u T 2090

Set point range
Connection
Operating pressure
Temperature range–30 to +70 °C
G 1¼ A conical joint
Max. 40 bar–60 to +60 °C

Temperature regulators with double adapter or manual adjuster
Double adapter Do3
A double adapter Do3 can be attached between the valve
and control thermostat to mount further control thermostats forthe use of additional controlled variables. The adapter is suited to attach a maximum of two control thermostats or control
units. One of the connections may be used to attach a manualadjuster.
Manual adjuster
For the manual operation of the valve. The manual adjuster
can either be attached directly to the valve instead of a control
thermostat or to the Do3 at connection b.
Technical data
Accessories

Data Sheet u T 2176

Connection to …

Globe and three-way valves(Series 43)
DN 15 to 50 · NPS ½ and 1
G ½ to 1 · ½ to 1 NPT
PN 16 · PN 25
Class 150 · Class 300

Valve size

Type 43-8 N

Pressure rating

Type 2040 Temperature Regulator for special applications
The Type 2040 Safety Temperature Monitor is used forprotection of consumer plants, especially in cryogenic service.
The regulator with integrated temperature sensor and set point
adjuster closes whenever the medium temperature falls below
the adjusted set point or when the sensor fails (safetyfunction).
Suitable for cryogenic gases and liquids as well as other liquids, gases and vapors.

Typetested temperature regulators
Typetested temperature regulators (TR), safety temperaturemonitors (STM) and safety temperature limiters (STL) and pressure limiters (PL) as well as combined regulators (e.g. TR/PL)
with limits up to 170 °C are part of the safety equipment usedin heat-generating installations.
These versions are DIN-tested and approved.
The register number and test mark are available on
request.

For details refer to the corresponding data sheets and Information Sheet u T 2181.

Globe valve withmanual adjuster

Type 43-8 Temperature Regulator withHydraulic ControllerType 2040 Safety Temperature
Monitor

Temperature regulator with doubleadapter Do3Fig. 11: Various temperature regulators

8T 2170 ENSample applications
T1

T2
9T3

9t1

1/82t1tm

Heatingenergy

Heating orcooling energy

9t2

t2

t2
T5

T4
t1

t1

t2

9t3

T6

t3

4

9

3

t1

4

t1

3

t2

10

10
t2
T7

t1

T8
93T9W

t3
t1

95

t3

t3

t1
6

9t2

t2

t2

T10

T11

t1

t1

To heat exchanger

9T12

1t1

92tm

To heatexchanger

2t2

10

91t2t2

Fig. 12: Sample applications (schematics)

Temperature regulation for different consumers

Temperature regulation in district heating systems andcooling installations

T1

Heating or cooling with globe valve

T2

Heating with three-way valve (mixing valve)

T9

Return flow temperature limitation

T3

Regulation of a water-heated air duct

T10

Return flow temperature increase in a boiler system

T4

Regulation of a steam-heated drying cabinet, drying chamber orstoreroom

T11

Temperature regulation of a condenser

T12

Regulation of the cooling water circuit of engines or compressors

Temperature regulation of boilers, heat generators and heatexchangers
T5Regulation of a water-heated boiler

T6

Regulation of a steam-heated boiler

T7

Regulation of a heat generator or water-heated heat exchanger

T8

Temperature regulation safeguarded by safety temperature monitor ona heat generator or water-heated heat exchanger

For further application examples of typetested regulators, refer toInformation Sheet u T 2081.

T 2170 EN

Legend for typical applications
1234568910

For heating: Types 43-1, 43-2, 43-5, 43-7, 43-2 N
For cooling: Type 43-6
Type 43-3
Types 43-1, 43-2, 43-2 N
Types 43-5 and 43-7
Types 43-1, 43-2, 43-5, 43-7, 43-2 N with
typetested safety equipment (TR/STL)
Types 43-1, 43-2, 43-5, 43-7, 43-2 N
Type 43-6
SAMSON strainer
Steam trap9

10T 2170 EN

T 2170 EN

11

T 2170 EN

2019-07-12 · EnglishSpecifications subject to change without notice