Samson 2333 series Service manual

Mounting and
Operating Instructions
EB 2552-1 EN
Self-operated Pressure Regulators
Type 2333 Pressure Reducing Valve with pilot valve
Edition November 2014
Type2333 Pressure Reducing Valve

Denition of signal words
DANGER!
Hazardous situations which, if not
avoided, will result in death or seri-
ous injury
WARNING!
Hazardous situations which, if not
avoided, could result in death or se-
rious injury
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action

2 EB 2552-1 EN

Contents
EB 2552-1 EN 3
1 General safety instructions.............................................................................4
2 Process medium and scope of application.......................................................5
2.1 Transportation and storage .............................................................................5
3 Design and principle of operation ..................................................................6
4 Installation....................................................................................................9
4.1 Notes on installation ......................................................................................9
4.2 Strainers .....................................................................................................10
4.3 Shut-off valve...............................................................................................10
4.4 Pressure gauges...........................................................................................10
5 Operation...................................................................................................11
5.1 Start-up.......................................................................................................11
5.2 Steam applications.......................................................................................11
5.3 Set point adjustment.....................................................................................11
5.4 Decommissioning.........................................................................................12
6 Maintenance ...............................................................................................13
7 Nameplate..................................................................................................17
8 Technical data.............................................................................................18
9 Dimensions .................................................................................................20
10 Customer service.........................................................................................22

4 EB 2552-1 EN
General safety instructions
1 General safety instructions
−The regulator must be mounted, started up or serviced by fully trained and
qualied personnel only; the accepted industry codes and practices are to
be observed. Make sure employees or third persons are not exposed to any
danger.
−All safety instructions and warnings given in these mounting and operating
instructions, particularly those concerning installation, start-up and mainte-
nance, must be strictly observed.
−According to these mounting and operating instructions, trained person-
nel refers to 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.
−The regulators comply with the requirements of the European Pressure Equip-
ment Directive 97/23/EC. The declaration of conformity issued for a regula-
tor bearing the CE marking includes information on the applied conformity
assessment procedure. The declaration of conformity is available on request.
−To ensure appropriate use, only use the regulator in applications where the
operating pressure and temperatures do not exceed the specications used
for sizing the regulator at the ordering stage.
−The manufacturer does not assume any responsibility for damage caused by
external forces or any other external factors.
−Any hazards that could be caused in the valve by the process medium, op-
erating pressure or by moving parts are to be prevented by taking appropri-
ate precautions.
−Proper transport, storage, installation, operation and maintenance are as-
sumed.

EB 2552-1 EN 5
Process medium and scope of application
2 Process medium and scope of application
Pressure regulators for set points from 2 to 28bar · Valve nominal sizes DN125 to 400 · Nom-
inal pressure PN16 to 40 · Suitable for liquids, gases and vapors up to 350°C
The differential pressure across the regulator is used as auxiliary energy to operate the valve.
To open the regulator, this pressure must be at least as high as the minimum differential pres-
sure ∆pmin specied in Table 1.
The mounted pilot valve (pressure reducing valve) determines the function of the regulator.
WARNING!
Risk of uncontrolled excess pressure in the plant.
Risk of bursting!
A suitable overpressure protection must be installed on site in the plant section.
2.1 Transportation and storage
The regulator must be carefully handled, transported and stored. Protect the regulator against
adverse inuences, such as dirt, moisture or temperature outside the ambient temperature
range.
Do not remove the protective caps from the valve ports until immediately before installing the
valve into the pipeline.
When regulators are too heavy to be lifted by hand, fasten the lifting sling at a suitable place
on the valve body.
WARNING!
Do not attach lifting slings or supports to mounting parts, such as control line, pilot
valve etc.
The valve can fall or mounting parts may be damaged.
Securely fasten slings or supports to the valve body and secure against slipping.

6 EB 2552-1 EN
Design and principle of operation
3 Design and principle of op-
eration
See Fig.1 and Fig.2.
The medium ows through the globe valve (1)
in the direction indicated by the arrow. The
position of the plug determines the ow rate
across the area released between plug (3)
and valve seat (2). The travel position of the
pilot valve (5) determines the pressure condi-
tions across the valve.
The forces created by the upstream pressure
p1acting on the plug surface and by the con-
trol pressure pSacting on the balancing bel-
lows (4) or balancing diaphragm (11) and
the force of positioning spring (3.1) are com-
pared.
In the Type 2333 Pressure Reducing Valve, a
rise in downstream pressure p2causes the pi-
lot valve to close. The control pressure pSin-
creases, and the plug of the main valve starts
to close. When the pilot valve is closed (p
S
=
p1), the pressure reducing valve (main valve)
is also completely closed.
Together with the pilot valve, the xed restric-
tion (8) or the Venturi nozzle (6) create the
control pressure pS.
If the downstream pressure p
2
falls again be-
low the set point, the pilot valve opens. The
control pressure pSfalls as a result. The force
resulting from the upstream pressure p
1
acting
on the plug surface causes the valve to open.
To ensure proper functioning, the minimum
differential pressure ∆pmin listed in Table 1
must be available as specied depending on
the eld of application.
The regulator version for steam is only avail-
able with valves balanced by a bellows. This
version has a condensation chamber (10) al-
ready tted in the control line. The needle
valve (9) is open and lead-sealed.
Before start-up, ll the condensation chamber
with water at the top ller opening.
Table 1: Minimum differential pressure ∆pmin
Nominal size DN125 DN150 DN200 DN250 DN300 DN400
Minimum
differential
pressure ∆pmin
Valve balanced by
a bellows for steam
applications
1.9bar 2.0bar 1.4bar 1.4bar – –
Valve balanced by a
bellows for air/water 1.0bar 1.0bar 0.7bar 0.7bar – –
Valve balanced by a
diaphragm 0.8bar 0.8bar 0.4bar 0.4bar 0.5bar 0.3bar

EB 2552-1 EN 7
Design and principle of operation
Type2333 Pressure Reducing Valve· Type 2422 Valve, balanced by a bellows·DN125 to 250
1
2
3
3.1
4
5
7
10
p1p2
8
9
Version suitable for steam
Version suitable for liquids and gases
1 Globe valve (main valve)
2Valve seat
3 Plug with plug stem
3.1 Positioning spring
4 Balancing bellows
5 Pilot valve
6 Venturi nozzle (for gases and liquids)
7 Strainer
8 Fixed restriction (version for steam)
9 Needle valve (version for steam)
10 Condensation chamber (only for steam or medium
temperatures above 150°C)
pSControl pressure
p1Upstream pressure
p2Downstream pressure
Fig.1: Functional diagram of valve balanced by a bellows
4
5
7
6
Lower section
with bellows Pilot valve
Type 2422 as main
valve balanced by a
bellows
Lower section
with bellows Pilot valve
pS
pS

8 EB 2552-1 EN
Design and principle of operation
Type2333 Pressure Reducing Valve· Type 2422 Valve, balanced by a diaphragm·DN125 to 400
1Valve body (main valve)
2Valve seat
3 Plug with plug stem
3.1 Positioning spring
5 Pilot valve
6 Venturi nozzle
7 Strainer
11 Balancing diaphragm
pSControl pressure
p1Upstream pressure
p2Downstream pressure
Fig.2: Functional diagram of valve balanced by a diaphragm
65
7
1233.1 11
p
1p2
Diaphragm section
Pilot valve
Type2422 as main
valve, balanced by a
diaphragm
pS

EB 2552-1 EN 9
Installation
4 Installation
See Fig.3.
Select the installation location making sure
that the regulator is installed at a distance of
at least six times the nominal size (DN) away
from pipe ttings, instruments or ow diver-
sions. They can change the ow conditions
which may lead to an instable control pro-
cess especially in applications with gases, air
or steam.
Contact SAMSON to obtain the TV-SK17041
documentation which contains more details on
installation requirements.
4.1 Notes on installation
Install the ready-assembled regulator in hori-
zontal pipelines.
−Flush and clean the pipeline thorough-
ly before installing the regulator. Other-
wise, impurities in the pipeline may im-
pair the proper functioning of the valve,
above all the tight shut-off.
−Direction of ow must match the direc-
tion indicated by the arrow on the body.
−Install the regulator free of stress. If nec-
essary, support the pipeline near to the
connecting anges. Do not attach sup-
ports directly to the valve or actuator.
−Install a strainer upstream of the regu-
lator.
−Protect the regulator from icing up when
controlling media that can freeze. If nec-
essary, depressurize and drain the reg-
ulator and remove it from the pipeline
while the plant is shut down.
Note:
The side on which the operating ele-
ments (hook-up of the pilot valve) are
located varies depending on whether
a valve balanced by a bellows or a di-
aphragm is used.
Mounting position
Valve balanced by a bellows
−Bellows including housing
suspended downward
Valve balanced by a diaphragm
−Balancing diaphragm (diaphragm sec-
tion) pointing upward
Insulation · To insulate cold systems, we rec-
ommend rst lling the plant and carefully
rinsing it (see section 5.1). The regulator must
not be insulated until the set point is adjusted.
−Start up the plant and adjust the set
point. Shut down the plant again and let
it warm up until the condensation water
has dried off.
−Afterwards, insulate the regulator and
pipes conveying the process medi-
um using insulation material with a wa-
ter vapor barrier. If the pilot valve has
a spring, it must must be protected by a
sleeve to allow it to move. The spring-
loaded actuator stem must not touch the
insulation.



10 EB 2552-1 EN
Installation
Fig.3: Installation example for Type 2333 Pressure Reducing Valve
1 Shut-off valve
2 Upstream pressure gauge
3 Strainer
5 Downstream pressure gauge
6Shut-off valve
9Venturi nozzle
10 Strainer in the pilot valve line
Thermal insulation
Note:
Do not insulate the pilot valve as well
in applications with medium tempera-
tures above 80°C.
Pressure testing of the plant · The pressure
must not exceed the maximum permissible
pressure of the regulator and plant on test-
ing the pressure of the plant when the regula-
tor is already installed. An excessive test pres-
sure can damage the balancing bellows or di-
aphragm. If necessary, remove the regulator
from the pipeline or isolate the regulator in the
pipeline and install a bypass.
4.2 Strainers
Install the strainer (e.g. SAMSON Type1/
Type 2) upstream of the pressure reducing
valve.
−The direction of ow must correspond to
the arrow on the body.
−The lter element must be installed to
hang downwards or sideways for appli-
cations with steam.
Tip:
Remember to leave enough space to
remove the lter element.
4.3 Shut-off valve
Install a hand-operated shut-off valve both
upstream of the strainer and downstream of
the regulator. This allows the plant to be shut
down for cleaning and maintenance, and
when the plant is not used for longer peri-
ods of time.
4.4 Pressure gauges
Install a pressure gauge both upstream and
downstream of the regulator to monitor the
pressures prevailing in the plant.

12 345
6
10
98
p1p2
Type 2422 as
main valve
Type 2333
Pressure
Reducing Valve
Pilot valve