Samson 3244-1 Manuale di servizio

Mounting and

Operating Instructions

EB 8026 EN

Edition July 2014

Type 3244 1 (left) and Type 3244-7 (right)

Type 3244-1 and Type 3244-7

Pneumatic Control Valves

2 EB 8026 EN

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 seri-

ous injury

NOTICE

Property damage message or mal-

function

Note:

Additional information

Tip:

Recommended action



Contents

EB 8026 EN 3

1 General safety instructions.............................................................................4

2 Design and principle of operation ..................................................................6

3 Assembling valve and actuator ......................................................................8

1.1 Assembly and adjustment ...............................................................................8

4 Installation....................................................................................................9

1.2 Mounting position..........................................................................................9

1.3 Arrangement of the valve ...............................................................................9

1.4 Signal pressure line........................................................................................9

1.5 Strainer, bypass .............................................................................................9

1.6 Test connection.............................................................................................10

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

6 Maintenance – Replacing parts ....................................................................12

1.1 Standard valve version.................................................................................13

1.1.1 Packing.......................................................................................................13

1.1.2 Seat and plug..............................................................................................14

1.2 Valve with insulating section or bellows seal...................................................14

1.2.1 Packing.......................................................................................................14

1.2.2 Seat and plug..............................................................................................16

1.2.3 Metal bellows ..............................................................................................17

1.2.4 Assembly ....................................................................................................17

7 Material number .........................................................................................18

8 Description of nameplates............................................................................18

9 Customer inquiries ......................................................................................19

4 EB 8026 EN

General safety instructions

1 General safety instructions

WARNING!

−The control valves are to be mounted, started up or serviced by fully trained and

qualied personnel only; the accepted industry codes and practices are to be ob-

served. Make sure employees or third persons are not exposed to any danger.

−All safety instructions and warnings given in these mounting and operating instruc-

tions, particularly those concerning installation, start-up and maintenance, must be

strictly observed.

−The control valves comply with the requirements of the European Pressure Equip-

ment Directive 97/23/EC. Valves with a CE marking have a declaration of confor-

mity which includes information about the applied conformity assessment proce-

dure. The Declaration of Conformity is available on request.

−To ensure appropriate use, only use the valve in applications where the operating

pressure and temperatures do not exceed the specications used for sizing the valve

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, the operating pressure, the

signal pressure or by moving parts are to be prevented by taking appropriate pre-

cautions.

−Proper shipping and storage are assumed.

NOTICE

−For installation and maintenance, make sure the relevant section of the pipeline is

depressurized and, depending on the process medium, drained as well. Depending

on the eld of application, allow the valve to cool down or warm up to reach ambi-

ent temperature before starting any work on it.

−When working on the valve, make sure that the pneumatic air supply as well as the

control signal are disconnected to prevent any hazards caused by moving parts.

−Be particularly careful if the actuator springs of pneumatic control valves are pre-

loaded. Such actuators are labeled correspondingly and can also be identied by

three long bolts protruding from the bottom of the actuator. Before starting any

work on the valve, relieve the compression from the preloaded springs.

EB 8026 EN 5

General safety instructions

Note:

According to the ignition risk assessment performed in accordance with EN13463-1:

2001, section 5.2, the non-electrical actuators and valves do not have their own po-

tential ignition source even in the rare incident of an operating fault. As a result, they

do not fall within the scope of Directive 94/9/EC.

For connection to the equipotential bonding system, observe the requirements speci-

ed in section 6.3 of EN60079-14: 2011 (VDE0165 Part 1).

Note:

These Mounting and Operating Instructions are also valid for the Type3246 Three-

way Valve – Class150 and 300 in conjunction with the Data Sheet T8046-3EN.



6 EB 8026 EN

Design and principle of operation

2 Design and principle of oper-

ation

The Type3244-1 and Type3244-7 Pneu-

matic Control Valves consist of the

Type3244 Three-way Valve and either a

Type3271 or Type3277 Pneumatic Actua-

tor. The modular design allows the actuators

to be exchanged and an insulating section

or metal bellows to be tted to the standard

valve version.

Depending on the plug version, the three-

way valve can be used either as a mixing or

diverting valve (in DN 15 to 25, the plugs

are identical).

In mixing valves, the process media to be

mixed enter at valve ports Aand B. The

combined ow exits the valve at port AB.

In diverting valves, the process medium en-

ters at the valve port AB and the partial

ows exit at ports Aand B.

The ow rate from ports Aor Bto AB and

vice versa depends on the cross-sectional ar-

ea of ow between the seat (2.1, 2.2) and

plug (3) and, as a result, on the position of

the plug stem (6).

The plug (3) is moved by a change in signal

pressure acting on the diaphragm of the ac-

tuator.

The plug stem (6) and actuator stem (8.1)

are connected by the stem connector (7) and

sealed by a spring-loaded PTFE ring packing

(4.2).

Fail-safe position

Depending on how the compression springs

are arranged in the actuator, the valve has

two different fail-safe positions:

Actuator stem extends

When the pressure is relieved or the supply

air fails, the springs cause port B(mixing

valves) or port A(diverting valves) to close.

The valve ports Bor Aare opened against

the force of the springs when the signal pres-

sure increases.

Actuator stem retracts

When the pressure is relieved or the supply

air fails, the springs cause port B(mixing

valves) or port A(diverting valves) to open.

The valve ports Bor Aare closed against the

force of the springs when the signal pressure

increases.

EB 8026 EN 7

Design and principle of operation

8.2

8.1

1.1

1.2

AB A

5.3

6.1

6.2

5.2

4.2

4.1

2.1

2.2

8.1

8.2

1.1

6.1

6.2

1.2

2.1

2.2

3.1

3.2

AB A

1.1 Nuts 5.2 Threaded bushing

1.2 Gasket 5.3 Travel indicator scale

2.1 Top seat 6 Plug stem

2.2 Bottom seat 6.1 Stem connector nut

3 Plug 6.2 Lock nut

3.1 Plug section 7 Stem connector

3.2 Screw 8 Actuator

4.1 Spring 8.1 Actuator stem

4.2 Packing 8.2 Nut

5 Valve bonnet

Type3271 Actuator

Type3277 Actuator

Plug arrangement for mixing service,

in DN15 to 25 also for diverting service

Plug arrangement for diverting service

DN32 to 150

Fig.1: Sectional drawings

8 EB 8026 EN

Assembling valve and actuator

3 Assembling valve and actua-

tor

The basic pneumatic actuator can be re-

placed by a pneumatic actuator with addi-

tional handwheel or by an electric actuator.

A pneumatic actuator (with or without hand-

wheel) can be replaced by another pneumat-

ic actuator in a different size.

If the travel range of the actuator is larger

than the travel range of the valve, the springs

in the actuator are preloaded by SAMSON

so that the travel ranges match.

3.1 Assembly and adjustment

Proceed as follows if the valve and actuator

have not been assembled by SAMSON or if

the actuator is to be replaced by an actuator

of another type or size:

1. Loosen the lock nut(6.2) and stem con-

nector nut(6.1) on the valve.

2. Press the plug together with the plug stem

rmly into the seat ring. Thread down the

lock nut and stem connector nut.

3. Remove the clamps of the stem connector

(7) and the ring nut (8.2) from the actua-

tor (8).

4. Slide the ring nut over the plug stem.

5. Place the actuator onto the valve bonnet

(5) and secure it with the ring nut (8.2).

6. Read the bench range (or bench range

with preloaded springs) and the actua-

tor's fail-safe action from the actuator's

nameplate (e.g.0.2 to 1bar and "actua-

tor stem extends").

The lower value corresponds to the lower

bench range value (0.2bar) to be adjusted,

whereas the upper value corresponds to the

upper bench range value (1bar).

The fail-safe action "actuator stem extends"

or "actuator stem retracts" is marked by FA

or FE on the Type3271 Actuator, and by a

corresponding symbol on the nameplate of

the Type3277 Actuator.

7. For actuators with "actuator stem ex-

tends" fail-safe action, apply a signal

pressure that corresponds to the lower

bench range value (e.g. 0.2bar) to the

connection on the bottom diaphragm

chamber.

For actuators with "actuator stem re-

tracts" fail-safe action, apply a signal

pressure that corresponds to the upper

bench range value (e.g. 1bar) to the top

diaphragm chamber connection.

8. Screw on the stem connector nut(6.1) by

hand until it touches the actuator stem

(8.1). Then turn it a further ¼turn and

secure this position with the lock

nut(6.2).

9. Position clamps of the stem connector (7)

and screw them tight.

10.Align the travel indicator(5.3) with the

tip of the stem connector.

EB 8026 EN 9

Installation

4 Installation

4.1 Mounting position

The valve can be mounted in any desired

position. However, to avoid increase wear at

the packing, install valves in DN100 or

larger in the upright position with the actua-

tor on top.

For valves tted with an insulating section or

bellows seal and for actuators weighing

more than 50kg, the actuator needs to be

supported or suspended.

NOTICE

Install the valve free of stress.

Pipeline routing

To ensure that the control valve func-

tions properly, the pipeline must be

straight and without any manifolds or

disturbances for a distance of at least

6times the valve size (DN) upstream

and downstream of the valve. Con-

tact SAMSON if this distance cannot

be observed.

Flush the pipeline thoroughly before

installing the valve.

Note:

Only insulate control valves with in-

sulating section or bellows seal up to

the bonnet ange of the valve body

for medium temperatures below 0°C

and above 220°C.

Do not insulate valves mounted to

comply with NACE MR0175 require-

ments.

4.2 Arrangement of the valve

Install the valve as shown in Fig.2 depend-

ing on whether it is to be used for mixing or

diverting service.

The installation examples apply to standard

operation with fail-safe action "actuator stem

extends" for heating applications and "actu-

ator stem retracts" for cooling applications.

Fail-safe position

The valve shuts off the ow of the heating or

cooling medium.

The plug arrangement (i.e. either mixing or

diverting valve) is indicated on a label at-

tached to the valve body.

In DN15 to25, the plug arrangement is the

same for mixing and diverting valves.

4.3 Signal pressure line

Connect the signal pressure line for valves

with an actuator with "actuator stem ex-

tends" fail-safe action to the connection on

the bottom diaphragm case, and for valves

with an actuator with "actuator stem re-

tracts" fail-safe action to the connection on

the top diaphragm case.

In the Type3277 Actuator, the bottom signal

pressure connection is located at the side of

the yoke under the bottom diaphragm case.

4.4 Strainer, bypass

We recommend installing a SAMSON

Type2 Strainer upstream of the valve, and

upstream of both inlet ports in mixing valves.



10 EB 8026 EN

Installation

We recommend installing a shut-off valve

both upstream of the strainer and down-

stream of the valve to ensure that the plant

does not need to be shut down for mainte-

nance. In addition, install a bypass line.

4.5 Test connection

Versions with bellows seal (Fig.4) tted with

a test connection (G

) at the top ange al-

low the tightness of the bellows to be moni-

tored. Particularly for liquids and vapors, we

recommend installing a suitable leakage in-

dicator, such as a contact pressure gauge,

an outlet to an open vessel or an inspection

glass.

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