Samson 43-1 Service manual

Temperature Regulators Series 43
Type 43-1
Type 43-2
Mounting and
operating instructions
EB 2171 EN
Edition August 2003
Type 43-1 ⋅ Version with
female thread
Type 43-2 ⋅ Version with
weld-on fittings
Type 43-2 ⋅ Version with flanged valve body
DN 32 to 50
Fig. 1 ⋅Temperature regulator versions

Contents Page
1. Design and principle of operation 4
1 1 Temperature regulator 4
1 2 Version with safety thermostat 4
1 3 Version with double adapter and/or manual adustment 4
2. Installation 6
2 1 Installing the valve 6
2 1 1 Strainer 6
2 1 2 Additional installation instructions 6
2 2 Installing the temperature sensor 6
2 2 1 Capillary tube 7
3. Operation 7
3 1 Set point adjustment 7
4. Maintenance  Replacing parts 8
4 1 Cleaning or replacing the plug 8
5. Trou leshooting 9
6. Dimensions in mm and weights 10
7. Customer inquiries 11
Contents
Typetesting
The Type 43-1 and Type 43-2 Temperature Regulators are typetested accord -
ing to DIN 344 by the German technical surveillance association TÜV.
Register number available on request
2EB 2171 EN

Safety instructions
General safety instructions
The temperature regulators may only be mounted, started up or serviced by
fully trained and qualified personnel, observing the accepted industry codes
and practices. Make sure employees or third persons are not exposed to any
danger.
All safety instructions and warnings in these mounting and operating instruc -
tions, particularly those concerning assembly, start-up and maintenance, must
be observed.
The control valves fulfil the requirements of the European Pressure Equipment
Directive 97/23/EC. Valves with a CE marking have a declaration of con-
formity which includes information about the applied conformity assessment
procedure. The declaration can be viewed and downloaded on the Internet at
http://www.samson.de.
For appropriate operation, make sure that the temperature regulators are
only used in areas where the operating pressure and temperatures do not ex -
ceed the operating values which are based on the valve sizing data submitted
in the order. The manufacturer does not assume any responsibility for dam -
age caused by external forces or any other external influence!
Any hazards which could be caused in the temperature regulator by the pro -
cess medium, the operating pressure or by moving parts are to be prevented
by means of the appropriate measures.
Proper shipping and appropriate storage are assumed.
Caution!
Do not start up the temperature regulators before the valve and control
thermostat have been installed.
Prior to removing the regulator from the pipeline, make sure the relevant sec -
tion of the pipeline is depressurized and drained.
Allow the plant to fill up slowly on start-up.
Make sure regulators are frost protected when used to control freezing media.
If the sensor is used in combination with a thermowell, only SAMSON thermo-
wells should be used.
EB 2171 EN 3

1. Design and principle of operation
1.1 Temperature regulator
The temperature regulators consist of a
valve with the Type 2430 K Thermostat
screwed onto it
The valve consists of a valve body, seat and
a pressure-balanced plug The thermostat
contains a positioning bellows, set point
spring, capillary tube and temperature sen -
sor
1.2 Version with safety thermostat
When a Type 2439 K/ 2403 K Safety
Thermostat is attached to the valve or regu-
lator, these versions are used as safety tem-
perature limiters STL or safety temperature
monitors STM
Refer to the mounting and operating instruc-
tions EB 2185 EN for more details
1.3 Version with dou le adapter
and/or manual adjustment
The temperature regulator can be equipped
with a double adapter and/or manual ad-
justment to control a further control vari-
able
Refer to the mounting and operating instruc-
tions EB 2176 EN for more details
Principle of operation:
The temperature regulator functions accord-
ing to the adsorption principle The tempera -
ture of the medium to be controlled creates
a pressure in the sensor which corresponds
with the temperature measured This press-
ure is transferred over the capillary tube
(10) to the operating element (13) where it
is converted into a positioning force
The force acts over the positioning bellows
(9) and pin of the operating element (12)
on the plug stem and plug (3)
By turning the set point adjuster (8), the
point of response over the spring (7) is
changed As a result, the valve plug moves
through its full travel range within a higher
or lower temperature range measured by
the sensor
Note:
Thermostats that function according to the
vapor pressure principle are described in
EB 243 -3 EN.
4EB 2171 EN
Design and principle of operation

Fig. 2 ⋅Sectional drawing
1.1
15
(20 Nm)
14
1
2
3
4
5
3
10
7
8
9
12
13
Type 43-2
Type 2432 K Valve
Type 43-1
Type 2431 K Valve (female thread)
Type 2439 K Thermostat
1Valve body
1 1 Connection nut with
gasket and weld-on
fitting
2Seat
3Plug
4Plug stem
5 Valve spring
7 Positioning spring
8 Set point adjuster
9Positioning bellows
10 Capillary tube
12 Pin of operating element
13 Operating element
14 Lead-sealed bore
15 Coupling nut
EB 2171 EN 5
Design and principle of operation

2. Installation
Make sure that the permissible ambient tem-
perature of 80 °C is not exceeded
2.1 Installing the valve
The valve must be installed in a horizontal
pipeline with the thermostat suspended
downwards Other installation positions are
also possible for temperatures lower than
110 °C
The direction of flow must correspond with
the arrow on the valve body
2.1.1 Strainer
Install a strainer (SAMSON Type 1 or
Type 2, refer to Data Sheet T 1010 EN and
1015 EN) upstream of the valve to prevent
any sealing parts, weld spatter or other im-
purities carried along by the process me-
dium from impairing the proper functioning
of the valve, particularly tight shut-off
The filter element of the strainer must be sus -
pended downwards
Make sure sufficient space is left to allow
the filter element to be removed
2.1.2 Additional installation instruc-
tions
We recommend installing a hand-operated
shut-off valve both upstream of the strainer
and downstream of the regulator to be able
to shut down the plant for cleaning and
maintenance, and when the plant is not
used for long periods of time
For checking the adjusted set point, it is ad-
visable to install a thermometer which is sub -
mersed in the controlled medium close to
the sensor
2.2 Installing the temperature sen-
sor
The Type 2430 K Temperature Sensor can
be installed in any position The instructions
of the corresponding mounting and opera-
ting instructions must be observed for the
Type 2430 K-3 Vapor Pressure Sensor The
entire length of the sensor must be immersed
in the medium which is being controlled Se-
lect a point of installation where overheating
and considerable delays cannot occur Weld
in a welding sleeve with G 1/2 or G 3/4 fe-
male thread at the point of installation
Seal the screw gland or thermowell into the
welded-in sleeve Insert the sensor and fix
into place using a clamping screw
Note: To prevent damage caused by corro-
sion, make sure that the same kinds of ma-
terials are used when installing the sensor
or thermowell. For example, do not use a
temperature sensor or thermowell made of
non-ferrous metal in a stainless steel heat ex-
changer. In this case, use a stainless steel
thermowell for the sensor.
Fig. 3 ⋅Example of installation in a water-heated boiler
1123 54
1Shut-off valve
2Strainer
3Temp regulator
4 Thermometer
5 Temperature sensor
6EB 2171 EN
Installation

2.2.1 Capillary tu e
The capillary tube must be run without ben-
ding or twisting it The smallest bending
radius should not be less than 50 mm
Do not damage or shorten the capillary
tube Roll up any excess tube to form a ring
Make sure no considerable temperature fluc-
tuations occur along the entire length of the
tube
3. Operation
3.1 Set point adjustment
Use the black plastic ring (set point adjus-
ter 8) to set the set point while watching
the reference thermometer
The adjustment diagrams are intended to
help you find a rough initial value
Turning the adjuster clockwise results in
a lower temperature and turning it
counterclockwise a higher temperature
The adjusted value can be lead-sealed at
the bore (14) in the set point adjuster
Set point range
°C
Change in set
point per turn
Sensor
diameter
0 to 35 2 5 9 5
216
25 to 70 395
216
40 to 100 495
316
50 to 120 495
4 5 16
70 to 150 4 5 9 5
516
Fig. 4 ⋅Adjustment diagrams
0
20
40
60
80
100
120
140
150
01234
70...150
50...120
40...100
25...70
0...35
˚C
0
20
40
60
80
100
120
140
150
01234
˚C
70...150
50...120
40...100
25...70
0...35
Tur ns ( sc a le m ar ki ng s)
Set point ranges for DN 15 to 25
with sensor Ø 9 5
Set point ranges for DN 32 to 50
with sensor Ø 16
EB 2171 EN 7
peration

4. Maintenance - Replacing parts
The temperature regulator is maintenance
free Nevertheless, it is subject to natural
wear, particularly at the seat and plug
Depending on the operating conditions, the
regulator needs to be checked at regular in -
tervals to avoid possible malfunctions
If the valve does not shut off tightly, this may
be due to dirt on the seat and plug, or the
valve seat and plug have become untight
due to natural wear
The valve can be removed from the pipeline
to repair it
Note
If you intend carrying out mainten-
ance work on the temperature regu-
lator, first relieve the corresponding
plant section of pressure and, de-
pending on the process medium,
drain it as well.
Let the plant section cool down to
reach ambient temperature, if
necessary.
We recommend removing the regu-
lator from the pipeline.
4.1 Cleaning or replacing the plug
To change the plug section (3), a special
socket wrench is needed:
For DN 15 to 25 Order no 1280-3001,
For DN 32 to 50 Order no 1280-3007
For nominal sizes DN 15 to 25, this wrench
can be made, for example, from a
GEDORE screwdriver bit (IN 19-19) by drill-
ing a hole into the 19 mm hexagon bit as
shown in Fig 5
Note: To replace the seat, a special tool is
additionally required. Refer to the
EB 29 EN (formerly WA 29 EN) for the
product numbers 271 to 273 (also avail-
able on the Internet at http://www.sam-
son.de/pdf_en/e 29 en.pdf).
1 Unscrew the coupling nut (15) and take
the control thermostat off the valve
2 Use the socket wrench to unscrew the
entire plug section
3 Thoroughly clean the seat and plug
If the seat is damaged, use the seat
wrench (EB 029 EN) to replace the
seat
If the plug is damaged, the entire plug
section as well as the seal ring in the
body must be replaced with new ones
4 Proceed in the reverse order to reas-
semble the valve
Insert a new seal ring for the plug sec-
tion in the body
Apply a drop of "Omnifit 222" before
screwing on the plug section (tightening
torque 80 Nm)
Tighten the coupling nut of the thermo-
stat on the valve with 20 Nm
Fig. 5 ⋅Socket wrench
17
Ø 17
SW 19
19 mm hexagon bit
8EB 2171 EN
Maintenance - Replacing parts

5. Trou leshooting
Pro lem Possi le source Remedy
The value at
the sensor
exceeds or falls
below the set
point
Leakage at the seat and
plug
Remove the valve Clean the seat and plug
Contact SAMSON after-sales service if the
regulator is defective
Valve is too small or too
big for the control task
Recalculate the KVS value and contact
SAMSON
Sensor is installed in the
wrong place
Check whether the entire length of the sensor
is immersed in the medium or whether it is in-
stalled where delays can occur or heat can
accumulate
Safety device, e g STL
or STM has been
triggered
Check the plant and unlock safety device
Insufficient cooling or
warming energy
available
Draw up an energy balance
The value at
the sensor
exceeds the
set point
Thermostat defective Send the thermostat to SAMSON for repair
Strainer is blocked Empty strainer filter and clean it
The medium flows
through the valve in the
opposite direction than
indicated by the arrow
Remove the valve and reinstall it so that the
medium flows through the valve in the
direction indicated by the arrow
Control loop
is unstable
Valve is too big for the
control task
Recalculate KVS value and contact SAMSON
Time constant is too
large for the control
loop
Fill the thermowell with conductive paste, or
remove thermowell or use a sensor with a
smaller time constant
EB 2171 EN 9
Troubleshooting

6. Dimensions in mm and weights
Type 43-1 Nom size G 1/2 3/4 1
Length L 65 75 90
Weight

App kg 1 4 1 5 1 6
Type 43-2 Nom sizeDN152025324050
Pipe Ød 21 3 26 8 33 7 42 48 60
R G 3/4 G 1 G 1 1/4 G 1 3/4 G 2 G 2 1/2
Width across flats SW 303646596582
Length L 65 70 75 100 110 130
L1 with weld-on fittings 210 234 244 268 294 330
Weight

App kg17 2 23445159
Special version with threaded ends (male thread)
Length L2 129 144 159 180 196 228
Male thread A G 1/2 G 3/4 G 1 G 1 1/4 G 1 1/2 G 2
Weight

App kg17 2 23445159
Special version with flanges PN 16/25
Length L3 130 150 160 180 200 230
Weight App kg 3 1 4 4 8 7 6 9 1

11

Version with flanged valve body
L3  200 230
Weight

App kg  10 13 2

For versions with bulb sensor and thermowell, versions without thermowell: minus 0 2 kg
10 EB 2171 EN
Dimensions in mm and weights