Samson 2333 series Manuale di servizio

Translation of original instructions

EB 2552-1 EN

Type2333 Pressure Reducing Valve with pilot valve

Self-operated Regulators

Edition October 2023

Definition of signal words

Hazardous situations which, if not avoided,

will result in death or serious injury

Hazardous situations which, if not avoided,

could result in death or serious injury

Property damage message or malfunction

Additional information

Recommended action

DANGER

WARNING

NOTICE

Note

Tip

EB 2552-1 EN

Note on these mounting and operating instructions

These mounting and operating instructions assist you in mounting and operating the device

safely. The instructions are binding for handling SAMSON devices. The images shown in

these instructions are for illustration purposes only. The actual product may vary.

ÎFor the safe and proper use of these instructions, read them carefully and keep them for

later reference.

ÎIf you have any questions about these instructions, contact SAMSON‘s After-sales Service

(aftersalesservice@samsongroup.com).

Documents relating to the device, such as the mounting and operating

instructions, are available on our website at www.samsongroup.com >

Service & Support > Downloads > Documentation.

Contents

EB 2552-1 EN

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 gauge ............................................................................................11

5 Operation...................................................................................................12

5.1 Start-up.......................................................................................................12

5.2 Pressure test.................................................................................................12

5.3 Steam applications.......................................................................................13

5.4 Adjusting the set point..................................................................................13

5.5 Decommissioning.........................................................................................13

6 Servicing.....................................................................................................14

7 Nameplate..................................................................................................18

8 Technical data .............................................................................................19

9 Dimensions .................................................................................................21

10 After-sales service .......................................................................................23

4 EB 2552-1 EN

General safety instructions

1 General safety instructions

− The device 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 parties 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 personnel

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 devices comply with the requirements of the European Pressure Equip-

ment Directive 2014/68/EU. Devices with a CE marking have an EU decla-

ration of conformity, which includes information about the applied conformi-

ty assessment procedure. This EU declaration of conformity can be provided

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sizesDN65to400·Pressure

rating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 dif-

ferentialpressure∆pminspeciedinTable1.

The attached pilot valve (acting as a pressure

reducing valve) determines the function of

the regulator.

Risk of uncontrolled excess pressure in the

plant.

Risk of bursting

If necessary, a suitable overpressure protec-

tion must be installed on site in the plant sec-

tion.

WARNING

2.1 Transportation and storage

The device must be carefully handled, trans-

ported 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 install-

ing the valve into the pipeline.

When regulators are too heavy to be lifted

by hand, fasten the lifting equipment to a

suitable place on the valve body.

Do not attach lifting slings or lifting equip-

ment to mounting parts, such as control

line, pilot valve etc.

The valve can fall or mounting parts may be

damaged.

Securely fasten slings or lifting equipment to

the valve body and secure against slipping.

WARNING

6 EB 2552-1 EN

Design and principle of operation

3 Design and principle of oper-

ation

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 seat (2). The travel position of the pi-

lot 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

control pressure pSacting on the balancing

bellows (4) or balancing diaphragm (11)

and the force of set point spring (3.1) are

compared.

IntheType2333PressureReducingValve,a

rise in downstream pressure p2causes the

pilot valve to close. The control pressure pS

increases and the plug of the main valve

starts to close. When the pilot valve is closed

(pS= p1), the pressure reducing valve (main

valve) is also completely closed.

Table1: Minimum differential pressure ∆pmin

Valve size DN65 DN80 DN100 DN125 DN150 DN200 DN250 DN300 DN400

Minimum differential

pressure∆pmin

Valvebalancedby

a bellows for steam

applications 0.2bar(640cm²actuator)

0.4bar(320cm²actuator)

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

Togetherwiththepilotvalve,thexedre-

striction(8)ortheVenturinozzle(6)create

the control pressure pS.

If the downstream pressure p2falls again be-

low the set point, the pilot valve opens. The

control pressure pSfalls as a result. The force

resulting from the upstream pressure p1act-

ing 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 compensation chamber (10)

alreadyttedinthecontrolline.Theneedle

valve (9) is open and lead-sealed. A com-

pensation chamber and needle valve are ad-

ditionally required for the version for steam

invalvesizesDN65to100.

Beforestart-up,llthecompensationcham-

berwithwateratthetoplleropening.

EB 2552-1 EN 7

Design and principle of operation

Type2333PressureReducingValve·Type2422Valve,balanced by a bellows·DN65 to 2501)

Versionsuitableforsteam 1

3.1

p1p2

Type 2422 as main valve balanced by a bellows

Bottom section

with bellows

Pilot valve

Versionsuitableforliquidsandgases

Pilot valve

Bottom section

with bellows

1 Globe valve (main valve)

2 Seat

3 Plug with plug stem

3.1 Set point spring

4 Balancing bellows

5 Pilot valve

6Venturinozzle(forgasesand

liquids)

7 Strainer

8 Fixed restriction (version for steam)

9 Needle valve (version for steam)

10 Compensation chamber (only for steam or

mediumtemperaturesabove150°C)

pSControl pressure

p1Upstream pressure

p2Downstream pressure

1) VersionwithcompensationchamberandneedlevalveforsteaminDN65to100

Fig.1: Functional diagram of valve balanced by a bellows

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

1233.1 11

Type2422 as main valve, balanced by a diaphragm

Diaphragm section

Pilot valve

1Valvebody(mainvalve)

2 Seat

3 Plug with plug stem

3.1 Set point spring

5 Pilot valve

6Venturinozzle

7 Strainer

11 Balancing diaphragm

pSControl pressure

p1Upstream pressure

p2Downstream pressure

Fig.2: Functional diagram of 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 valve size (DN) away

frompipettingsorinstrumentsthatcause

owturbulence(e.g.pipebends,manifolds,

pressure measuring points or other valves).

Theycanchangetheowconditionswhich

may lead to an instable control process es-

pecially 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 thoroughly

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.

− Thedirectionofowmustmatchthedi-

rection indicated by the arrow on the

body.

− Install the regulator free of stress. If nec-

essary, support the pipeline near the

connectinganges.Donotattachsup-

ports directly to the valve or actuator.

− Install a strainer upstream of the regula-

tor.

− Protect the regulator from icing up when

controlling media that can freeze. If nec-

essary, depressurize and drain the regu-

lator and remove it from the pipeline

while the plant is shut down.

The side on which the operating elements

(hook-up of the pilot valve) are located var-

ies depending on whether a valve balanced

by a bellows or a diaphragm is used.

Mounting orientation

Observetheowdirection.

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

recommend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 heat up until the condensation water

has dried off.

− Afterwards, insulate the regulator and

pipes conveying the process medium

using insulation material with a water

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.

Note



10 EB 2552-1 EN

Installation

Thermal insulation

Do not insulate the pilot valve as well in ap-

plications with medium temperatures above

80°C.

Pipeline routing

The inlet and outlet lengths vary depending

on several variables and process conditions

and are intended as recommendations.

Contact SAMSON if the lengths are

signicantlyshorterthantherecommended

lengths.

To ensure that the regulator functions proper-

ly, proceed as follows:

ÎObserve the inlet and outlet lengths (see

Table2).ContactSAMSONiftheregula-

tor conditions or state of the medium

process deviate.

ÎInstall the regulator free of stress and

with the least amount of vibrations as

possible.

ÎFor media with a tendency to conden-

sate, install the pipeline with a slight

downward slope on both sides so that

the condensate can drain properly. If the

pipeline upstream and downstream of

the regulator run vertically upwards, an

automatic drainage is required.

ÎInstalltheregulatorallowingsufcient

space to remove the actuator and valve

or to perform service work on them.

Note

Pressure testing of the plant·Thepressure

must not exceed the maximum permissible

pressure of the regulator and plant on testing

the pressure of the plant when the regulator

is already installed. An excessive test pres-

sure can damage the balancing bellows or

diaphragm. If necessary, remove the regula-

tor from the pipeline or isolate the regulator

in the pipeline and install a bypass.

4.2 Strainers

Installa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.

− Do not use the strainer to permanently

ltertheprocessmedium.

− Thelterelementmustbeinstalledto

hang downwards or sideways for appli-

cations with steam.

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 periods

of time.

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