Samson 250 series Manual de servicio

Mounting and

Operating Instructions

EB 8053 EN

Edition June 2014

Type 3252 High-pressure valve with Type3277 Pneumatic Actuator and Type3767 Electropneumatic

Positioner

Series 250

Type3252‑1 and Type3252‑7

Pneumatic Control Valves

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



2 EB 8053 EN

Contents

EB 8053 EN 3

1 General safety instructions.............................................................................5

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

1.1 Fail-safe position............................................................................................6

1.2 Replacing the actuator....................................................................................6

3 Assembling and adjusting the valve and actuator ...........................................8

1.1 Reversal of the operating direction ..................................................................9

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

1.2 Signal pressure line........................................................................................9

5 Troubleshooting...........................................................................................10

1.1 Removing the actuator from the valve ............................................................10

1.2 Replacing the packing in standard valves.......................................................10

1.2.1 Plug............................................................................................................11

1.2.2 Seat............................................................................................................11

1.1 Replacement in valve with insulating section or bellows seal ............................12

1.1.1 Packing.......................................................................................................12

1.1.2 Plug............................................................................................................12

1.1.3 Metal bellows ..............................................................................................12

1.1.1 Reassembly .................................................................................................14

6 Appendix....................................................................................................15

1.1 Nameplate ..................................................................................................15

1.2 Customer inquiries .......................................................................................15

4 EB 8053 EN

EB 8053 EN 5

General safety instructions

1 General safety instructions

For your own safety, follow these instructions concerning the mounting, start-up and opera-

tion of the valve:

−The valve is to be mounted, started up or operated only by trained and experienced per-

sonnel familiar with the product.

−According to these mounting and operating instructions, trained personnel refers to indi-

viduals who are able to judge the work they are assigned to and recognize possible dan-

gers due to their specialized training, their knowledge and experience as well as their

knowledge of the applicable standards.

−Any hazards that could be caused in the valve by the process medium, the signal pres-

sure or by moving parts are to be prevented by taking appropriate precautions.

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

sure and temperatures do not exceed the specications used for sizing the valve at the or-

dering stage.

To avoid damage to any equipment, the following also applies:

−Proper shipping and storage are assumed.

6 EB 8053 EN

Design and principle of operation

2 Design and principle of oper-

ation

The Type 3252 Valve with a globe-style or

angle-style body can be combined with

either a Type3271 Pneumatic Actuator or a

Type3277 Pneumatic Actuator with integral

positioner attachment.

The standard valve bodies have threaded

ends with either G or NPT thread.

Special valve versions are designed with

either weld-on anges or welding ends for

welding into the pipeline.

The modular design allows the actuators to

be exchanged and an insulating section or

metal bellows to be tted to the standard

valve version

The medium ows through the valve in the

direction indicated by the arrow. The plug is

moved by changing the signal pressure act-

ing on the diaphragm of the actuator. The

plug stem (6) is connected to the actuator

stem (8.1) by the stem connector (7).

The plug stem is sealed by a spring-loaded

V-ring packing (4.2).

2.1 Fail-safe position

Depending on how the springs are arranged

in the actuator, the control valve assumes

one of two different fail-safe positions:

Actuator stem extends (fail-close): When the

pressure is relieved from the diaphragm or

the supply air fails, the actuator springs close

the valve.

Actuator stem retracts (fail-open): When the

pressure is relieved from the diaphragm or

the supply air fails, the actuator springs

open the valve.

2.2 Replacing the actuator

A pneumatic actuator can be replaced by

another pneumatic actuator in a different

size.

If the travel range of the actuator is larger

than the travel of the valve, the springs in the

actuator are preloaded by SAMSON so that

the travel ranges match.

EB 8053 EN 7

Design and principle of operation

1Valve body

1.1 Gasket

2 Seat

4.1 Spring

4.2 Packing

4.3 Washer

5Valve bonnet

5.1 Guide bushing

5.2 Threaded bushing

5.3 Yoke

5.4 Ring nut

5.5 Screw

5.6 Anti-rotation xture

5.7 Travel indicator

scale

6 Plug stem

6.1 Stem connector nut

6.2 Lock nut

7 Stem connector

8.1 Actuator stem

8.2 Ring nut

8.3 Springs

8.4 Rolling diaphragm

9Signal pressure con-

nection

10 Vent plug

8.4

8.3

8.2

8.1

5.3

5.7

6.1

6.2

5.2

5.1

5.4

4.1

1.1 5.5

5.6

4.2

4.3

Fig.1: Sectional drawing of Type3252 Valve with Type3271 Actuator (120cm²)

8 EB 8053 EN

Assembling and adjusting the valve and actuator

3 Assembling and adjusting the

valve and actuator

Proceed as follows if the original 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. 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. Slide the ring nut over the plug stem.

4. Place the actuator onto the yoke(5.3)

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

5. Read the bench range or (signal pressure

range with preloaded springs) and oper-

ating direction of the actuator specied

on the actuator nameplate.

Note:

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 corre-

sponding symbol on the nameplate

of the Type3277 Actuator.

The lower value corresponds to the

lower bench range value to be ad-

justed, whereas the upper value cor-

responds the upper bench range val-

ue.

6. For fail-close actuators, apply a signal

pressure that corresponds to the lower

bench range value (e.g. 0.6bar for a

range between 0.6 and 1bar) to the sig-

nal pressure connection on the bottom

diaphragm chamber.

For fail-open actuators, apply a signal

pressure that corresponds to the upper

bench range value (e.g. 0.6bar for a

range between 0.2 and 0.6bar) to the

signal pressure connection on the top di-

aphragm chamber.

7. 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)

8. Position clamps of the stem connector (7)

and screw them tight. Align the travel in-

dicator(5.7) with the tip of the stem con-

nector.

The following applies to removing the actu-

ator:

ÎApply a signal pressure that is slightly

higher than the lower bench range value

(see actuator nameplate) to the signal

pressure connection.

Note:

Actuators with preloaded springs are

labeled correspondingly and can al-

so be identied by three long bolts

protruding from the bottom of the ac-

tuator.



EB 8053 EN 9

Installation

3.1 Reversal of the operating

direction

The operating direction and fail-safe action

of pneumatic actuators can be changed. Re-

fer to the mounting and operating instruc-

tions of the actuator for details on how to

proceed:

−Types 3271 and 3277 Actuator

(120cm²):

u EB 8310-1EN

−Types 3271 and 3277 Actuator (350

and 700cm²):

u EB 8310-6EN

4 Installation

The following applies concerning the instal-

lation of the valve:

ÎThe valve can be mounted in any desired

position. The ow of direction must cor-

respond with the direction indicated by

the arrow on the valve body.

ÎMake sure the valve is installed free of

stress. If necessary, support the pipelines

near the connections.

ÎFlush the pipeline thoroughly before in-

stalling the valve (valve open).

The following points additionally apply to

the version with welding ends:

ÎThe valve must be welded into the pipe-

line by trained personnel observing the

applicable standards.

ÎBefore welding the valve into the pipe-

line, move the plug out of the seat. The

entire valve does not need to be disman-

tled.

ÎBefore start-up, make sure that the valve

is free from weld spatter and other impu-

rities.

4.1 Signal pressure line

Connect the signal pressure line for a valve

with fail-close actuator to the connection on

the bottom diaphragm case, and for a valve

with fail-open actuator 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.

10 EB 8053 EN

Troubleshooting

5 Troubleshooting

External leakage can indicate that the pack-

ing is defective or the metal bellows is defec-

tive (in a version with a bellows seal).

If the valve does not close tightly, tight shut-

off may be impaired by dirt stuck between

the seat and plug or by damaged facings.

ÎIn this case, remove parts, carefully clean

them and renew them, if necessary.

ÎBefore starting any work on the valve

body, rst remove the actuator (see sec-

tion5.1).

WARNING!

Risk of injury due to process medium

escaping under pressure.

Depressurize the relevant section of

the pipeline and, if necessary, drain

it as well. When used at high tem-

peratures, allow the plant section to

cool down to ambient temperature.

Tip:

Before performing maintenance

work, we recommend removing the

valve from the pipeline or the entire

valve construction when the valve is

welded into the pipeline.

5.1 Removing the actuator

from the valve

1. Mount the stem connector clamps (7) be-

tween the actuator stem and the plug

stem.

2. For fail-close actuators, apply a signal

pressure that is higher than the lower

bench range value (see nameplate) to the

actuator so that the ring nut (8.2) can be

unscrewed.

3. Unscrew the ring nut.

4. Disconnect the signal pressure again.

5. Remove the actuator from the valve yoke.

5.2 Replacing the packing in

standard valves

Note:

Contact your nearest SAMSON sub-

sidiary or the SAMSON After-sales

Service department for information

on suitable lubricants.

ÎSee Fig.1 on page 7

If the packing leaks, replace it as follows:

1. Unscrew the ring nut (5.4) and remove

the yoke (5.3) from the valve bonnet.

2. Unscrew the lock nut(6.2) and stem con-

nector nut(6.1). Unscrew the screw (5.5)

for the anti-rotation xture. Remove the

anti-rotation xture (5.6).

3. Undo screws (5) on the valve bonnet. Re-

move the valve bonnet along with the

plug stem (6).



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