Samson 250 series Mounting And Operating Instructions

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 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



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 opera­tion 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 dan­gers 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 or­dering 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 act­ing 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

1 Valve body

1.1 Gasket
2 Seat

4.1 Spring

4.2 Packing

4.3 Washer
5 Valve 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

9 Signal pressure con-

nection

10 Vent plug

10

9

8.4

8.3

8.2

8.1

5.3

5.7

7

6.1

6.2

5.2

5.1

2

1

5.4

4.1

1.1

5.5

5.6

5

4.2

4.3

6

9

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 con­nector 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 actua­tor. 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 oper­ating 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 corre­sponding symbol on the nameplate

of the Type3277 Actuator.

The lower value corresponds to the
lower bench range value to be ad­justed, whereas the upper value cor­responds 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 sig­nal 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 di­aphragm 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 in­dicator(5.7) with the tip of the stem con­nector.

The following applies to removing the actu­ator:

Î Apply 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. Re­fer to the mounting and operating instruc­tions 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 instal­lation of the valve:

Î The valve can be mounted in any desired

position. The ow of direction must cor­respond with the direction indicated by
the arrow on the valve body.

Î Make sure the valve is installed free of

stress. If necessary, support the pipelines
near the connections.

Î Flush the pipeline thoroughly before in-

stalling the valve (valve open).

The following points additionally apply to
the version with welding ends:

Î The valve must be welded into the pipe-

line by trained personnel observing the
applicable standards.

Î Before welding the valve into the pipe-

line, move the plug out of the seat. The
entire valve does not need to be disman­tled.

Î Before 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 pack­ing is defective or the metal bellows is defec­tive (in a version with a bellows seal).

If the valve does not close tightly, tight shut­off may be impaired by dirt stuck between
the seat and plug or by damaged facings.

Î In this case, remove parts, carefully clean

them and renew them, if necessary.

Î Before starting any work on the valve

body, rst remove the actuator (see sec­tion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 tem­peratures, 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 sub­sidiary or the SAMSON After-sales
Service department for information

on suitable lubricants.

Î See 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).



EB 8053 EN 11

Troubleshooting

4. Undo the threaded bushing (5.2). Pull the
plug stem along with the plug out of the
valve bonnet.

5. Unscrew thread bushing (5.2) and push
out the packing rings (4.2), washer (4.3)
and spring (4.1) using a suitable tool.

6. Clean the packing chamber thoroughly.

7. Apply a suitable lubricant to the plug
stem and packing rings (4.2).

8. Slide the plug stem with the plug into the
valve bonnet.
Slide the spring (4.1), washer (4.3) and
new packing rings over the plug stem in­to the packing chamber.

9. Insert the threaded bushing (5.2) and
tighten it as far as it will go.

10. Loosely screw the lock nut(6.2) and stem
connector nut(6.1) onto the plug stem
(6).

11. Insert the new gasket (1.1) into the body.

12. Fasten the valve bonnet to the body

(tightening torque of 500Nm).

13. Place the anti-rotation xture (5.6) on the
valve bonnet ensuring that the screw
(5.5) is inserted into the long hole. Fas­ten tight.

14. Place the yoke(5.3) on the valve body
and secure it with the ring nut (5.4).

15. Mount the actuator and adjust the upper
and lower bench range values (see sec­tion3).

Tip:

When replacing the seat and plug,

we also recommend replacing the

packing (4.2).

5.2.1 Plug

Î Proceed as described in section5.2.

Replace the old plug with a new plug
with plug stem.

Î Apply a suitable lubricant to the plug

stem before insertion.

5.2.2 Seat

Î Proceed as described in section5.2 and

additionally unscrew the seat (2).

Î Apply a suitable lubricant to the thread

and the sealing cone of the new seat.
Screw in the seat (tightening torque of
180Nm).
Alternatively, an old seat can be used af­ter it has be machined or thoroughly
cleaned.

12 EB 8053 EN

Troubleshooting

5.3 Replacement in valve with
insulating section or bel­lows seal

5.3.1 Packing

1. Unscrew the ring nut (5.4) and lift off the

yoke (5.3).

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

nector nut(6.1). Undo the threaded
bushing (5.2).

3. Unscrew the screw (16). Remove the

anti-rotation xture (5.6).

4. Undo screws (5) on the valve bonnet. Lift

the valve bonnet over the plug stem ex­tension (12).

5. Replace packing as described in sec-

tion5.2.

5.3.2 Plug

1. Unscrew the ring nut (5.4) and lift off the

yoke (5.3).

2. Unscrew the screw (5.5). Remove the

anti-rotation xture (5.6).

3. Undo screws (5) on the valve bonnet. Lift

the valve bonnet along with the interme­diate piece (11) of the bellows seal or in­sulating section off the valve body.

Î To unscrew the plug stem (6) from the

plug stem extension (12), screw the stem
connector nut (6.1) and lock nut (6.2)
until they lock each other. Place a wrench
on the nuts to allow the plug stem exten­sion to be held stationary.

Î Make sure that absolutely no torque is

transferred to the bellows which is at­tached to the intermediate piece.

4. Apply a suitable lubricant to the the plug
stem (6) of the old machined or new

plug.

5. Check whether the two washers (12.1)

are still in the plug stem extension (12).
Screw the plug stem tightly into the plug
stem extension (tightening torque of
50Nm).

5.3.3 Metal bellows

1. Unscrew the plug stem (6) along with
plug out of the plug stem extension (12)
as described in section5.3.2.

2. Unscrew the nut (14) using a SAMSON
socket wrench (order no. 93252-0000-

085).

3. Pull the bellows seal (13) with the plug
stem extension welded to it out of the in­termediate piece (11).

4. Clean the sealing faces on the intermedi­ate piece.

5. Slide the new bellows seal into the inter­mediate piece and fasten with nut (14)
(tightening torques: up to PN 160 =
85Nm, up to PN 400 on request).

6. Check whether the two washers (12.1)
are still in the plug stem extension.

7. Apply a suitable lubricant to the thread
of the plug stem and screw the plug stem
tightly into the plug stem extension (12)
(tightening torque of 50Nm).

EB 8053 EN 13

Troubleshooting

5.3

5.2

6.1

6.2

5.4

5

16

15

11.1

14

13

12

12.1

6

5.5

5.6

1.1

11

Version

with

insulating
section

Version with
bellows seal

1.1 Gasket
5 Valve bonnet

5.2 Threaded bushing

5.3 Yoke

5.4 Ring nut

5.5 Screw

5.6 Anti-rotation xture
6 Plug stem

6.1 Stem connector nut

6.2 Lock nut

11 Intermediate piece

11.1 Gasket
12 Plug stem extension

12.1 Washers
13 Bellows seal
14 Nut
15 Anti-rotation xture

16 Screw

Fig.2: Version with insulating section or bellows seal

14 EB 8053 EN

Troubleshooting

5.3.4 Reassembly

1. After exchanging the plug, seat and met­al bellows, renew the gaskets (1.1 and

11.1) on the intermediate piece (11).

2. Fasten the intermediate piece (11) to the
valve body (tightening torque of
500Nm).

3. Place the anti-rotation xture (5.6) on the
valve body ensuring that the screw (5.5)
is inserted into the long hole. Fasten

tight.

4. Place the valve bonnet (5) over the plug

stem extension onto the intermediate
piece (12) and fasten it in the intermedi­ate piece (tightening torque of 120Nm).

5. Place the anti-rotation xture (15) on the
valve bonnet ensuring that the screw (16)
is inserted into the long hole. Fasten

tight.

6. Reapply a suitable lubricant to the plug
stem and packing rings.
Slide the spring (4.1), washer (4.3) and
packing rings (4.2) over the plug stem
into the packing chamber.

7. Insert the threaded bushing (5.2) and
tighten it as far as it will go.

8. Loosely screw the lock nut(6.2) and stem
connector nut(6.1) onto the plug stem
extension (12).

9. Place the yoke onto the valve bonnet and
secure it with the ring nut (5.4).

10. Mount the actuator and adjust the upper
and lower bench range values as de­scribed in section3.

EB 8053 EN 15

Appendix

6 Appendix

6.1 Nameplate

SAMSON

12

DN

PN
CI

K

vs

C

v

33–

78

6

1 Type designation
2 Nominal size
3 Order no. with modication index

6 Material
7 Nominal pressure
8 K

VS/CV

coefcient

Fig.3: Nameplate for valve

SAMSON

1

6

57

VFH

234

1 Type designation
2 Modication index
3 Actuator area
4 Fail-safe action:

FA Actuator stem extends

FE Actuator stem retracts
5 Actuator travel
6 Bench range
7 Bench range with preloaded springs

Fig.4: Nameplate for Type 3271 Actuator

6.2 Customer inquiries

Please submit the following details:

− Type designation and order number
(stamped on the nameplate)

− Version and nominal size of the valve

− Pressure and temperature of the process

medium

− Flow rate in m³/h

− Bench range of the actuator

− Installation drawing

SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: [phone] · Fax: [phone]
[e-mail] · www.samson.de

EB 8053 EN

2014-10-20 · English