Samson 42-37 Service manual

Self-operated Regulators
Flow and Differential Pressure Regulator
Type 42-37
Flow and Differential Pressure or
Flow and Pressure Regulator Type 42-39
Mounting and
Operating Instructions
EB 3017 EN
Edition September 2008
Flow and differential pressure or pressure regulators
Type 42-37 Type 42-39

Contents Page
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 4
2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Control line, equalizing tank and needle valve . . . . . . . . . . . . . . 8
2.3 Strainer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Shut-off valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5 Pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Set point adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Set point for flow rate . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.2 Set point for differential pressure. . . . . . . . . . . . . . . . . . . . 15
3.2.3 Pressure set point in Type 42- 39 Flow and Pressure Regulator . . . . . 16
3.3 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Customer service . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Maintenance · Troubleshooting . . . . . . . . . . . . . . . . . . . . 18
6 Nameplates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2EB 3017 EN
Contents
CAUTION!
CAUTION indicates a hazardous situation
which, if not avoided, may result in injury.
NOTICE
NOTICE indicates a property damage
message.
Note: Supplementary explanations, informa-
tion and tips
Definitions of the signal words used in these instructions

EB 3017 EN 3
Safety instructions
General safety instructions
4
The regulators must be installed, started up and serviced by fully trained
and qualified personnel only, observing the accepted industry codes and
practices. Make sure employees or third persons are not exposed to any
danger.
4
The regulator complies with the requirements of the European Pressure
Equipment Directive 97/23/EC. The declaration of conformity issued for a
valve bearing the CE marking includes information on the applied
conformity assessment procedure.
The declaration of conformity can be provided on request.
4
For appropriate operation, make sure that the regulator is only used in
applications where the operating pressure and temperatures do not exceed
the operating values based on the sizing data submitted in the order.
Note that the manufacturer does not assume any responsibility for damage
caused by external forces or any other external factors.
4
Any hazards which could be caused in the regulator by the process medium
or operating pressure are to be prevented by means of appropriate
measures.
4
Proper shipping and appropriate storage are assumed.
Note: Non-electric valve versions which do not have a valve body lined with an insulating
coating do not have their own potential ignition source according to the ignition risk assessment
stipulated in EN 13463-1: 2002, section 5.2, even in the rare incident of an operating fault.
Therefore, they do not fall within the scope of Directive 94/9/EC.
For connection to the equipotential bonding system, observe the requirements specified in
section 6.3 of EN 60079-14: 2003 (VDE 0165 Part 1).

1 Design and principle of
operation
The regulators limit the flow rate in the pipe-
line. The set point for the flow rate is adjusted
at the restriction and the set point for the dif-
ferential pressure or the downstream pressure
is adjusted at the actuator. The largest signal
is always used to actuate the valve.
The regulators mainly consist of the
Type 2423 Valve with seat, plug and restric-
tion together with the Type 2427 or
Type 2429 Closing Actuator with operating
diaphragms. Valve and actuator are deliv-
ered separately and must be assembled on
site using a coupling nut
The medium flows through the valve in the di-
rection indicated by the arrow. The position
of the restriction (1.1) and the area released
by the valve plug (3) determine the flow rate
and the differential pressure Δp across the
plant.
The valve is fully balanced. The forces acting
on the valve plug created by the upstream
and downstream pressures are balanced by
a balancing bellows (5) or balancing dia-
phragm (Type 2423 balanced by a dia-
phragm, DN 125 to 250).
The principle of operation of the regulators
with valves balanced by a bellows or dia-
phragm only differ concerning the pressure
balancing. The valves balanced by a dia-
phragm have a balancing diaphragm (Fig. 2)
instead of a bellows (Fig. 1). The downstream
pressure p2acts on the inside and the up-
stream pressure p1on the outside of the dia-
phragm. As a result, the forces acting on the
valve plug are balanced out.
Type 42-37: The high pressure of Δp is trans-
mitted through the control line (18) to the dia-
phragm chamber D. The high pressure of the
flow rate (V
.) upstream of the restriction (1.1)
is transmitted through the control line (19) to
the diaphragm chamber C. This pressure is
equal to the low pressure of Δp. The low pres-
sure of V
.downstream of the restriction is
transmitted through holes in the plug and dia-
phragm stems to the diaphragm chamber A.
If, for example, the differential pressure rises,
the positioning force at the bottom operating
diaphragm (13.2) rises, too. This change in
force causes the diaphragm stems (12.2 and
12.1) and the valve plug (3) to move in the
closing direction until the set point adjusted at
the set point spring (16) is reached.
If the flow rate increases, the differential pres-
sure at the restriction (1.1) and the resulting
positioning force at the top diaphragm (13.1)
increase. This change in differential pressure
at the restriction causes the top diaphragm
stem (12.1) to push the plug stem and the
valve plug (3) in the closing direction until the
adjusted flow set point is reached. The largest
signal is always used to actuate the valve.
The overload protection (force limiter with in-
ternal excess pressure limiter) (15) protects
the seat, plug and plant during extreme oper-
ating conditions against overloading.
Type 42-39: The principle of operation is al-
most the same as for Type 42-37. However,
the high pressure of the flow rate V
.is sepa-
rate from the low pressure of the differential
pressure Δp in the Type 2429 Actuator. The
diaphragm chambers for these pressures
have their own control line connections.
4EB 3017 EN
Design and principle of operation

EB 3017 EN 5
Design and principle of operation
Fig. 1 · Sectional drawings of regulators with valves balanced by a bellows
Type 42-39Type 42-37
1 Valve body
1.1 Restriction for flow set point
1.2 Lock nut
1.3 Cap
2 Seat
3 Plug
4 Plug stem
5 Balancing bellows
7 Spring
8 Venting (DN 125 and higher)
9 Differential pressure spring
11 Coupling nut
12.1 Top diaphragm stem
12.2 Bottom diaphragm stem
13.1 Top operating diaphragm
13.2 Bottom operating diaphragm
15 Overload protection (force
limiter with internal excess
pressure limiter)
16 Set point spring
17 Set point adjustment
18 Control line on site
19 Control line (+) V
.
20 Control line (+) Δp
21 Restriction to dampen signal
Type 2423 Valve
balanced by a
bellows
Type 2427
Actuator Type 2429
Actuator

Note on Type 42-37 DoT and Type 42-39
DoT
These regulators can also be used for temper-
ature control and limitation in combination
with Type 2231 Temperature Regulator by
using a double adapter DoT.
Refer to the following Mounting and Oper-
ating Instructions in this case:
EB 3019 EN for DoT double adapter
and
EB 2231 EN for Type 2231 to 2235 Control
Thermostats.
6EB 3017 EN
Design and principle of operation
Fig. 2 · Sectional drawing of regulator with valve balanced by a diaphragm
Type 42-37/Type 42-39 · DN 125 to 250 · Balanced by a diaphragm
1 Valve body
1.1 Restriction for flow set point
1.2 Lock nut
1.3 Cap
2 Seat
3 Plug
5 Balancing diaphragm
7 Plug stem
18 Control line
Type 2427/2429 Actuator
Type 2423 Valve
balanced by
a diaphragm

2 Installation
Install Type 42-37 Regulator in the low pres-
sure line (return flow) of the plant.
Install Type 42-39 Regulator in the high pres-
sure line (flow) of the plant.
Refer to installation schematics in Fig. 3.
On selecting the position of installation, make
sure that the regulator can still be easily ac-
cessed after completion of the plant.
NOTICE
The regulator must be installed free of stress. If
necessary, support the piping near the con-
nections. However, do not attach supports to
the valve or actuator.
EB 3017 EN 7
Installation
Fig. 3 · Installation schematics (top) and typical installation (bottom)
1 Shut-off valve
2 Strainer
3 Flow and differential pressure
regulator
4 Equalizing tank, required for medium
temperatures above 150 °C
or for steam applications
5 Needle valve
6 Pressure gauge
7 Bypass with capped valve
Type 42-39 in flow pipe
Pressure and flow rate control
Type 42-39 in flow pipe
Differential pressure and flow
rate control
Type 42-37 in return flow pipe
Differential pressure and flow rate control

Note: Install a strainer (e.g. SAMSON
Type 2 N/2 NI) upstream of the regulator to
prevent sealing particles, welding spatter or
other impurities carried along by the process
medium from impairing the proper function-
ing of the valve, especially tight shut-off.
2.1 Mounting position
See Fig. 4 for permissible mounting positions.
Standard mounting position · Install valve
without actuator in a horizontal pipeline with
the connection for the actuator facing down-
wards. Make sure the medium flows through
the valve in the direction indicated by the ar-
row. Then connect the actuator to the valve
using the coupling nut (11).
NOTICE
Protect the regulator when it is used to control
freezing process media.
On shutting down the plant in areas not free
from frost, depressurize and empty the regu-
lator and remove it from the pipeline.
2.2 Control line, equalizing tank
and needle valve
Control lines · Control lines preferably using
8x1mmsteel or stainless steel pipe must be
provided at the site of installation.
Connect the control line for pressure tapping
in Type 42-37 to the pipeline upstream of the
consumer. Make sure the pressure tapping
point is at least3xDNaway from any instru-
ments (pipe manifolds, distributors, other
valves) that can cause turbulence in the flow
(Fig. 5.1). How the line is routed generally
depends on the installation location.
The same rules apply to the control line in-
stalled on site for Type 42-39 (connected
downstream of the consumer).
We recommend connecting the control line at
the side of the main pipeline (Fig. 5.4).
Do not change the pipe diameter of the main
pipeline so that it is off center!
Type 42-37
Attach the supplied low-pressure control line
to the regulator as shown in Fig. 1.
At the site of installation, route the high-pres-
sure control line with 8 mm (standard),
10 mm or 12 mm pipe diameter from the bot-
tom diaphragm chamber to the high-pressure
line (flow) of the plant.
8EB 3017 EN
Installation
Fig. 4 · Permissible mounting positions
–Only versions with fixed
plug guide and
up to max. 80 °C
–All versions in DN 15 to 80
and up to max. 80 °C
–Standard mounting position
– all versions –
–Above 80 °C,
steam applications

Type 42-39
Attach the supplied control lines to the regula-
tor as shown in Fig. 1. When used as a flow
and differential pressure regulator, addition-
ally route a control line at the site of installa-
tion from diaphragm chamber C to the
low-pressure line (return flow) of the plant.
When used as a flow and pressure regulator,
leave the connection for diaphragm chamber
C open.
Control line kit · A control line kit for tapping
pressure directly at the valve body is avail-
able as an accessory from SAMSON. Refer to
Data Sheet T 3095 EN.
Needle valve · If the regulator tends to hunt,
we recommend installing a SAMSON needle
valve in the control line routed on site at the
actuator connection.
Note: Needle valves, equalizing tanks and
compression-type screw fittings can be sup-
plied as required. These accessories are listed
in the Data Sheet T 3095 EN.
Equalizing tank · An equalizing tank is re-
quired for liquids above 150 °C. Prior to
start-up, fill the equalizing tank with the me-
dium to be regulated. This prevents hot me-
dium coming into direct contact with the dia-
phragm.
Depending on how the regulator is installed,
install the equalizing tank in any control line
used with hot media. The mounting position
of the equalizing tank is indicated by an ad-
hesive label on the tank itself as well as by an
arrow and the word "top" stamped onto the
top of the tank.
EB 3017 EN 9
Installation
Fig. 5 · Connection of control lines
5.1 · Control line connection, depending on
how the pipeline is routed
5.3 · Connection at the top – incorrect
Incorrect!
5.4 · Connection at the side – correct
5.2 · Connection at the bottom – incorrect
Incorrect!
Correct!
DN = Nominal size

Install the equalizing tank near to the pressure
tapping point in the flow pipe or at the same
height as the valve (Fig. 6) to ensure that the
control line reaches from at least the mid axis
the valve to the actuator. This ensures that a
hot medium can cool down sufficiently.
NOTICE
Adhere to the mounting position and dis-
tances prescribed, otherwise the safe func-
tioning of the regulator cannot be guaran-
teed.
2.3 Strainer
A strainer installed in the flow pipe prevents
foreign matter and dirt particles in the me-
dium from entering the regulator. The
SAMSON product range includes the Type 2
N/2 NI Strainer (refer to Data Sheet T 1010
EN).
Install the strainer upstream of the regulator.
Make sure the direction of medium flow cor-
responds with the direction indicated by the
arrow on the strainer. The filter element must
be suspended downwards or be located at
the side for applications with steam. Remem-
ber to leave enough space to remove it.
2.4 Shut-off valve
We recommend installing a hand-operated
shut-off valve (Fig. 3) both upstream of the
strainer and at the outlet of the return flow
pipe to be able to shut down the plant for
cleaning and maintenance, and when the
plant is not used for longer periods of time.
2.5 Pressure gauge
To monitor the pressures in the plant, install a
pressure gauge both upstream and down-
stream of the regulator. Install the pressure
gauge on the downstream side behind the
downstream pressure tapping point.
10 EB 3017 EN
Installation
Fig. 6 · Type 42-37 with equalizing tank
Minimum length
of control line
T2<150 °C
Type 42-37
T1>150 °C

3 Operation
3.1 Start-up
CAUTION!
First start up the regulator after mounting all
the components, e.g valve, actuator and con-
trol lines.
Make sure the control lines are open and cor-
rectly connected before start-up.
Note: On filling the plant, make sure the re-
striction (1.1) is open by turning the adjust-
ment screw counterclockwise as far as it will
go.
4Open all the valves on the consumer
side. Slowly open the shut-off valves
starting on the return flow pipe first. In
case of valves balanced by a bellows in
DN 125 or larger, vent the bellows hous-
ing (8) at the stopper located at the side
of the bellows housing.
If needle valves are installed in the control
lines, open them before start-up. Fill equaliz-
ing tanks with the process medium before
start-up.
Rinsing the plant · After filling the plant, first
completely open the consumers. If this is not
possible open the bypass. Open the restric-
tion for flow rate adjustment with a differen-
tial pressure set point spring at maximum
compression. Rinse out the pipeline at full
flow rate for several minutes. Check the in-
stalled strainer (e.g. by measuring the pres-
sure drop) afterwards. Clean the strainer, if
necessary.
NOTICE
The pressure at the actuator must not exceed
the nominal pressure by 1.5 times on testing
the pressure of the plant when the regulator is
already installed
The control lines must route the test pressure
to the actuator at the same time to prevent the
actuator diaphragms from being damaged.
When Type 42-39 is used as a flow and pres-
sure regulator, do not connect the control line
to diaphragm chamber C.
3.2 Set point adjustment
3.2.1 Set point for flow rate
Note: Before adjusting the flow rate, you first
need to adjust the set point for the differential
pressure (or pressure) to its maximum value,
To do this, turn the nut (17) clockwise to load
the set point spring (16).
The control valves and shut-off valves as well
as all consumers or a bypass valve, if appli-
cable, must be opened to reach the maximum
flow rate, but without the high differential
pressure (pressure) being able to close the
valve.
Turn the restriction (1.1) until the required
flow rate is reached, by reading, for exam-
ple, the flow rate reading off a heat meter (see
Table 1 · Flow rate set point ranges).
Note: Always start the adjustment from a
closed restriction!
EB 3017 EN 11
Operation

4Turn clockwise to close the restriction.
This reduces the flow rate.
4Turn counterclockwise to open the restric-
tion. This raises the flow rate.
You can also use the adjustment diagrams for
water in Figs. 7, 8 and 9 on the following
pages to help you make the flow rate adjust-
ment.
Note: The differential pressure at the restric-
tion
Δ
p
restriction
is fixed at either 0.2 bar or
0.5 bar (see nameplate) by the differential
pressure spring(s) (9) in the actuator.
4Unscrew cap (1.3) and undo lock nut
(1.2). Turn the adjustment screw clock-
wise as far as it will go.
4Find the flow set point in the diagram
and determine how many turns are re-
quired.
4Turn the screw counterclockwise (based
on a closed restriction) until the selected
set point is adjusted.
4Check the flow rate at the heat meter
and correct, if necessary.
4When the required flow rate is reached,
lock the screw in position with the lock
nut (1.2) and screw cap (1.3) back on.
Lead-seal cap, if necessary.
4Close the open bypass valve again, if
applicable.
12 EB 3017 EN
Operation
Table 1 · Flow rate set point ranges for water
Type 2423 · Balanced by a bellows
Nominal size DN 15 20 25 32 40 50 65 80 100 125 150 200 250
Flow rate set point ranges for water in m³/h
Differential pressure
at restriction
Δprestriction= 0.2 bar
0.05
to
2
0.15
to
3
0.25
to
3.5
0.4
to
7
0.6
to
11
0.9
to
16
2
to
28
3.5
to
35
6.5
to
63
11
to
80
18
to
120
20
to
180
26
to
220
Differential pressure
at restriction
Δprestriction = 0.5 bar
0.15
to
3
0.25
to
4.5
0.4
to
5.3
0.6
to
9.5
0.9
to
16
2
to
24
3.5
to
40
6.5
to
55
11
to
90
18
to
120
20
to
180
26
to
260
30
to
300
Type 2423 · Balanced by a diaphragm
Nominal size DN 125 150 200 250
Flow rate set point ranges for water in m³/h
Differential pressure
at restriction
Δprestriction = 0.2 bar 11 to 120 18 to 180 20 to 320 26 to 350

EB 3017 EN 13
Operation
Fig. 7 · Adjustment diagram for Type 2423 balanced by a bellows, DN 15 to 80
Turns of set point adjustment (orifice)
Turns of set point adjustment (orifice)
– – – – Δprestriction = 0.5 bar ______ Δprestriction = 0.2 bar
Adjustment diagrams valid for water

14 EB 3017 EN
Operation
Fig. 8 · Adjustment diagram for Type 2423 balanced by a bellows, DN 100 to 250
Turns of set point adjustment (orifice)
Turns of set point adjustment (orifice)
– – – – Δprestriction = 0.5 bar ______ Δprestriction = 0.2 bar
Adjustment diagrams valid for water

3.2.2 Set point for differential
pressure
Note: Before adjusting the differential pres-
sure, reduce the maximum flow rate by ap-
proximately 5 % by closing a shut-off valve on
the consumer side or the bypass.
If a motorized valve is used in the plant, close
this by approximately 10 % of its travel.
Turn the nut (17) counterclockwise to unload
the set point springs (16) and adjust the dif-
ferential pressure set point. While doing this,
compare the pressures upstream and down-
stream of the consumer by reading off the in-
stalled pressure gauges (see Fig. 3). If you
want to adjust small differential pressure set
points, we recommend using a differential
pressure gauge instead of two pressure
gauges.
4Turn the nut (17) clockwise to increase
the set point.
4Turn the nut (17) counterclockwise to
reduce the set point.
EB 3017 EN 15
Operation
Fig. 9 · Adjustment diagram for Type 2423 balanced by a diaphragm, DN 125 to DN 250
DN 200, DN 250 · A = 320 cm2·Δprestriction = 0.2 bar
Balanced by a diaphragm
DN 125, DN 150 · A = 320 cm2·Δprestriction = 0.2 bar
Balanced by a diaphragm
Turns of set point adjustment (orifice)
Adjustment diagrams valid for water

3.2.3 Pressure set point in
Type 42- 39 Flow and
Pressure Regulator
Adjust the pressure set point at the nut (17).
While doing this, read the pressure off the in-
stalled pressure gauge on the downstream
side .
4Turn the nut (17) clockwise to increase
the downstream pressure.
4Turn the nut (17) counterclockwise to re-
duce the downstream pressure.
3.3 Decommissioning
Close the shut-off valves starting from the up-
stream side (high-pressure line).
CAUTION!
On performing any work on the regulator,
make sure the relevant section of the pipeline
is depressurized and, depending on the pro-
cess medium, drained as well.
For high temperatures, allow the regulator to
cool down to ambient temperature before
starting any work on it.
Interrupt or shut off the control line to avoid
any hazards which could be caused by mov-
ing parts.
As valves are not free of cavities, remember
that residual process medium might still be
contained in the valve.
We recommend to remove the valve from the
pipeline. Make sure that all the plant sections
connected to the control lines are also
depressurized. If this is not the case, shut off
the control lines.
16 EB 3017 EN
Operation

4 Customer service
Should any malfunctions or any defect occur, SAMSON's After-Sales Service is prepared to
help you on site.
You can also send the defective regulator directly to your local SAMSON representative for re-
pair. Addresses of SAMSON subsidiaries, agencies and service centers are listed in the prod-
uct catalogs and in the Internet at www.samson.de.
To allow SAMSON to find the fault and to have an idea of the installation situation, specify the
following details (refer to the nameplate):
4Type and nominal size of the valve
4Threaded or flanged end connections
4Model number
4Upstream and downstream pressure
4Flow rate in m3/h
4Has a strainer been installed?
4Sketch of the installation with exact position of regulator and all additional installed com-
ponents (shut-off valves, pressure gauges, etc.).
EB 3017 EN 17
Customer service

5 Maintenance · Troubleshooting
The regulators are maintenance free. Nevertheless, they are subject to natural wear, particu-
larly at the seat, plug and operating diaphragm. Depending on the operating conditions, the
regulator needs to be checked at regular intervals to avoid possible malfunctions. Details on
faults and the recommended action can be found in the table below.
18 EB 3017 EN
Maintenance · Troubleshooting
Malfunction Possible reasons Recommended action
Flow rate or
differential
pressure
exceeds its
set point
Seat and plug untight Remove valve from pipeline. Clean seat and plug. Replace plug, if necessary. Otherwise send the regulator
to SAMSON for repair.
Operating diaphragm
defective Replace diaphragm or send the regulator to SAMSON for repair.
Control line blocked Remove control line and clean it.
Valve too large for flow
control or too small for
differential pressure control
Recalculate KVS coefficient and contact SAMSON for
further action.
Flow rate or
differential
pressure set
point is not
reached
Seat and plug untight Remove valve from pipeline. Clean seat and plug. Replace plug, if necessary. Otherwise send the regulator
to SAMSON for repair.
Wrong set point range
selected Check set point range and contact SAMSON for further action.
Safety equipment, e.g.
pressure limiter, has been
triggered Check plant and unlock safety equipment.
Insufficient pressure drop
across the plant
Compare existing differential pressure in the plant with
the plant’s drag.
Differential pressure across the plant Δpmin =
Δprestriction + (VK
.
VS
/)².
Strainer blocked Drain and clean filter of the strainer
Direction of flow, valve
incorrectly installed Install the valve so that the direction of flow is the same as indicated by the arrow.
Control loop
hunts
Valve too large for the
control task at hand Recalculate KVS coefficient. Contact SAMSON.
Restriction (or needle valve)
is missing in a control line to
dampen pulsation
Check restriction in the connection to chamber D
(Type 42-37) or chamber C (Type 42-39). If necessary,
install a needle valve in the control line and start to close
it until the control loop becomes stable.
Caution! Do not completely close needle valves.
Table 2 · Troubleshooting

6 Nameplates
Valve and actuator both have a nameplate.
EB 3017 EN 19
Nameplates
Fig. 10 · Nameplates
Actuator nameplate
Valve
1 Valve type
2 Model number
3 Model number index
4 Order number or order date
5K
VS coefficient
8 Nominal size
9 Nominal pressure
10 Perm. differential pressure in bar
11 Perm. temperature in °C
12 Body material
ANSI version
5 Nominal size
8 Perm. differential pressure in psi
9 Perm. temperature in °F
10 Body material
11 CVcoefficient (KVS x 1.17)
12 ANSI Class (pressure rating)
Actuator
1 Model number
2 Model number index
3 Order number or order date
4 Effective diaphragm area
5 Labeling acc. to DIN
6 Labeling acc. to ANSI
7 Max. perm. pressure
8 Nominal size
9 Differential pressure at restriction
10 Set point range
11 Diaphragm material
12 Year of production
ANSI version
DIN version
Valve nameplates

7 Technical data
20 EB 3017 EN
Technical data
Table 3 ·Technical data · Type 42-37 · Type 42-39
Type 2423 Valve · Balanced by a bellows
Nominal size DN 15 to DN 100 DN 125 to DN 250
Nominal pressure PN 16, 25 or 40 (acc. to DIN EN 12516-1)
Pressure at which internal
excess pressure limiter
responds (Type 42-37 only)
160 cm² 1.2 bar
320 cm² 0.6 bar
Max. perm. temperature
Valve body See pressure-temperature diagram
Actuator 1) With equalizing tank: Liquids up to 220 °C
Without equalizing tank: Liquids up to 150 °C
Differential pressure or
pressure set point bar 0.1 to 0.6 ⋅0.2 to 1 ⋅0.5 to 1.5 ⋅1 to 2.5 ⋅2 to 5
4.5 to 10 2)
Leakage rate ≤0.05 % of KVS coefficient
Type 2423 Valve · Balanced by a diaphragm
Nominal size DN 125 to DN 250
Nominal pressure PN 16, 25 or 40 (acc. to DIN EN 12516-1)
Pressure at which internal
excess pressure limiter
responds (Type 42-37 only)
160 cm² 1.2 bar
320 cm² 0.6 bar
640 cm² 0.3 bar
Max. perm. temperature Valve body See pressure-temperature diagram
Actuator 1) Liquids up to 150 °C
Differential pressure or pressure set point 0.1 to 0.6 bar ⋅0.2 to 1 bar ⋅0.5 to 1.5 bar ⋅1 to 2.5 bar
2 to 5 bar 2)
Leakage rate ≤0.05 % of KVS coefficient
1) Higher temperatures possible on request
2) On request