Samson 2333 series Manuale di servizio

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

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

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

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

3.1

p1p2

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

Lower section

with bellows Pilot valve

Type 2422 as main

valve balanced by a

bellows

Lower section

with bellows Pilot valve

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

1233.1 11

1p2

Diaphragm section

Pilot valve

Type2422 as main

valve, balanced by a

diaphragm

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.



345

p1p2

Type 2422 as

main valve

Type 2333

Pressure

Reducing Valve

Pilot valve

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