Samson 2408 Mounting And Operating Instructions
Self-operated Pressure Regulators
Excess Pressure Valve
Type 2408
Fig. 1· Type 2408 Excess Pressure Valve
Edition June 2010
Mounting and
Operating Instructions
EB 2528 EN
Contents Page
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Process medium, application range, versions. . . . . . . . . . . . . . . . . 4
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Strainer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Shut-off valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.5 Control line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Adjusting the set point. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Maintenance and troubleshooting . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Pressure fluctuations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 EB 2528 EN
Contents
CAUTION!
Indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
NOTICE
Indicates a risk of property damage.
Note! Indicates supplementary explanations,
information and tips.
Definitions of the signal words used in these instructions
EB 2528 EN 3
Safety instructions
General safety instructions
Observe the following instructions on installation, start-up and operation of the regulator for
your own safety:
4
The regulator is to be mounted, started up or 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.
All safety instructions and warnings in these mounting and operating
instructions, particularly those concerning assembly, start-up and
maintenance, must be observed.
4
According to these mounting and operating instructions, trained personnel is
referred to as individuals who are able to judge the work they are assigned to
and recognize possible dangers due to their specialized training, their
knowledge and experience as well as their knowledge of the applicable
standards.
4
The regulator fulfils the requirements of the European Pressure Equipment
Directive 97/23/EC.
4
For appropriate operation, make sure that the regulator is only used in areas
where the operating pressure and temperatures do not exceed the operating
values specified in the order that the valve sizing data are based on.
4
The manufacturer does not assume any responsibility for damage caused by
external forces or any other external influence!
4
Any hazards that could be caused in the regulator by the process medium, the
operating pressure or by moving parts are to be prevented by means of the
appropriate measures.
4
Proper shipping and storage are assumed.
Note! Non-electric valve versions whose bodies are not lined with an insulating material coat
ing do not have their own potential ignition source according to the 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.
1 Design and principle of opera
-
tion
See also Fig. 2, page 5.
The process medium flows through the valve
in the direction indicated by the arrow on the
body. The position of the valve plug (3) deter
mines the flow rate across the area released
between the valve's plug and seat (2).
In pressureless state (control line not con
nected or no pressure applied), the valve is
closed by theforce of the set point springs (7).
The upstream pressure p
1
to be controlled is
tapped upstream of the regulator. Using an
external control line, this pressure is transmitted to the tapped connection (9) on the actuator housing (6) where it is converted into a positioning force by the diaphragm plate with
operating diaphragm (5). This positioning
force is used to move the plug stem (4) and
thus the valve plug depending on the force of
the set point springs (7). The spring force can
be adjusted on the set point adjuster (8).
When the force resulting from the upstream
pressure p
1
exceeds the adjusted set point,
the valve opens proportionally to the change
in pressure.
1.1 Process medium, application
range, versions
Excess pressure valve for set points between
5 mbar to 1000 mbar for gases at tempera
tures from –20 to +60 °C.
Valves with flanged body in DN 15 and
DN 25 as well as with G ½, G ¾ and G1fe
male thread.
2 Installation
See also Fig. 2, page 5.
NOTICE
Install a strainer (e.g. SAMSON Type 2 NI)
upstream of the regulator (refer to sec
tion 2.2).
Make sure the regulator is mounted free of
stress. If necessary, support the piping near
the connecting flanges. Never attach supports
directly to the valve or actuator.
2.1 Mounting position
Mounting position (preferable)
– Install the regulator in a
horizontal pipeline with the
actuator housing and set
point adjuster pointing vertically up,
– The direction of flow must correspond to
the arrow on the body,
– Install the control line with a downward
slope of approx. 10 % towards the tapping
point to allow condensed liquid to flow
back into the tank or pipeline.
Other mounting positions
–
Install the regulator in a
vertical pipeline with the
actuator housing and set
point adjuster pointing to
the side.
Note! Higher system deviations may occur in
this mounting position.
–
Make sure the direction of flow matches the
arrow on the body (from bottom to top).
4 EB 2528 EN
Design and principle of operation
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