Samson 3244-1, 3244-7 Mounting And Operating Instructions

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 seri­ous injury

WARNING!

Hazardous situations which, if not
avoided, could result in death or seri­ous injury

NOTICE

Property damage message or mal­function

Note:

Additional information

Tip:

Recommended action

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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 ob­served. 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 confor­mity which includes information about the applied conformity assessment proce­dure. 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 pre­cautions.

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

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6 EB 8026 EN

Design and principle of operation

2 Design and principle of oper-

ation

The Type3244-1 and Type3244-7 Pneu­matic 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 A and B. The
combined ow exits the valve at port AB.

In diverting valves, the process medium en­ters at the valve port AB and the partial

ows exit at ports A and B.
The ow rate from ports A or B to 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 ac­tuator.

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 B or A are opened against
the force of the springs when the signal pres­sure 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 B or A are closed against the
force of the springs when the signal pressure
increases.