Samson 45-1, 45-2, 45-4, 45-3 Mounting And Operating Instructions
Differential Pressure Regulators
Type 45-1
Type 45-2
Type 45-3
Type 45-4
Type 45-1 Differential Pressure Regulator
Type 45-2 Differential Pressure Regulator
Mounting and
Operating Instructions
EB 3124 EN
Edition March 2008
Contents
Contents Page
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 4
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Control line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Strainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Shut-off valves, pressure gauges. . . . . . . . . . . . . . . . . . . . . 6
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Set point adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Maintenance – Replacing parts . . . . . . . . . . . . . . . . . . . . . 7
4.1 Cleaning or replacing the plug . . . . . . . . . . . . . . . . . . . . . 7
4.2 Replacing the diaphragm . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Dimensions and weights . . . . . . . . . . . . . . . . . . . . . . . 10
8 Customer inquiries . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 EB 3124 EN
Safety instructions
General safety instructions
The differential pressure regulator must be installed, started up and serviced
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only by skilled or semi-skilled staff in accordance with good engineering
practice so that employees and third persons are not exposed to danger.
All safety instructions and warnings given in these mounting and operating
instructions, particularly those concerning installation, start-up, and
maintenance, must be strictly observed.
The regulator complies with the requirements of the European Pressure
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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 and will be provided on request.
To ensure appropriate use, only use the regulator in applications where the
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operating pressure and temperatures do not exceed the operating values
specified in the order.
Note that the manufacturer does not assume any responsibility for damage
caused by external forces or any other external factors.
Take appropriate safety precautions to prevent hazards that may be caused
in the regulator by the process medium, operating pressure, or moving parts.
Make sure the regulator is shipped and stored properly.
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Note!
Depending on the field of application, allow the regulator to cool down or
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warm up to reach ambient temperature prior to starting any work.
Always depressurize the relevant section of the plant and, if necessary, also
drain the pipeline prior to removing the regulator from the pipeline.
When controlling freezing media, protect the regulator against frost.
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Note!
Non-electric control valves, whose valve bodies are not lined with an
insulating material coating, do not have their own potential ignition source
according to the ignition risk assessment stipulated in EN 13463-1: 2001,
section 5.2, even in the rare incident of an operating fault. Therefore, such
valve versions do not fall within the scope of Directive 94/9/EC.
EB 3124 EN 3
Design and principle of operation
1 Design and principle of
operation
The regulators consist of a valve with a bal
anced plug and a closing actuator with an
operating diaphragm.
Types 45-1 and 45-3 have a fixed set point
determined by the set point spring inte
grated in the valve body, whereas
Types 45-2 and 45-4 allow the set point to
be adjusted by the set point springs attached
to the actuator.
The regulators are designed to maintain the
differential pressure between the high-pres
sure and low-pressure pipes at the adjusted
set point. The valve closes when the differential pressure rises.
On Types 45-1 and 45-2 installed in a flow
pipe, the medium flows through the valve in
the direction indicated by the arrow. The
high pressure in the valve outlet is transmitted through the attached control line (11) to
the high-pressure side of the operating diaphragm. The low pressure from the return
pipe is transmitted to the low-pressure side
of the diaphragm via the control line (12)
which must be routed externally on site.
On Types 45-3 and 45-4 installed in a re
turn pipe, the low pressure upstream of the
valve is directed over an internal hole (13)
to the low-pressure side of the diaphragm.
The high pressure from the flow pipe is
transmitted to the high-pressure side of the
diaphragm through the control line (11)
which must be routed externally on site.
The differential pressure acting on the oper
ating diaphragm generates a positioning
force, which positions the plug against the
force of the set point springs (8, 10).
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2 Installation
2.1 Mounting position
Install the differential pressure regulator in a
horizontal pipeline with the actuator verti
cally suspended. Regulators in nominal sizes
DN 15 to 25 may also be installed in verti
cal pipelines.
For medium temperatures above 80 °C,
note that the regulator must not be installed
with the diaphragm actuator pointing up
ward.
Make sure that the medium flows through
the valve in the direction indicated by the
arrow on the valve body.
2.2 Control line
Adapt a control line with a 6 mm pipe diameter to the installation conditions on site.
Then attach it to the valve and to the pipeline according to the applicable installation
schematics (Fig. 1), making sure the control
line is free of any dirt.
2.3 Strainer
Install a strainer (e.g. SAMSON Type 1 NI)
upstream of the regulator to prevent sealing
particles, weld spatter, pipe scale, and other
impurities carried along by the process me
dium from impairing the proper operation,
especially the tight shut-off of the regulator.
Make sure that the medium flow corre
sponds with the direction indicated by the
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arrow on the strainer body. Install the
strainer with the filter element vertically sus
pended. Ensure that ample space is avail
able to remove the filter.
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4 EB 3124 EN
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