Page 1
Pneumatic Actuator
Type 3271
Fig. 1 · Type 3271 Actuators
Type 3271
Type 3271-5
Type 3271 with handwheel
Type 3271-52
Mounting and
Operating Instructions
EB 8310 EN
Edition October 2004
Page 2
Contents Safety instructions
Contents Page
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 3
2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Reversing the operating direction (fail-safe action) . . . . . . . . . . . . 6
2.1.1 Type 3271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.2 Actuator with handwheel . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Replacing the diaphragm and stem seal . . . . . . . . . . . . . . . . 10
2.3 Adjusting the travel stop . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Manual operation of Type 3271 with side-mounted handwheel . . . . . 12
2.4.1 Normal operation with the handwheel locked . . . . . . . . . . . . . 12
2.4.2 Actuator stem extends upon air supply failure . . . . . . . . . . . . . 12
2.4.3 Actuator stem retracts upon air supply failure. . . . . . . . . . . . . . 12
2.4.4 Actuator stem extends when supply air is applied. . . . . . . . . . . . 13
2.4.5 Actuator stem retracts when supply air is applied . . . . . . . . . . . . 13
3 Description of nameplate . . . . . . . . . . . . . . . . . . . . . . . 14
4 Customer inquiries . . . . . . . . . . . . . . . . . . . . . . . . . . 15
General safety instructions
Assembly, start-up and operation of the device may only be performed by
4
trained and experienced personnel familiar with this product.
According to these mounting and operating instructions, trained personnel is
referred to individuals who are able to judge the work they are assigned to
and recognize possible hazards due to their specialized training, their
knowledge and experience as well as their knowledge of the relevant
standards.
Any hazards which could be caused by the signal pressure and moving
4
parts of the actuator are to be prevented by means of appropriate
measures.
Proper shipping and appropriate storage are assumed.
4
2 EB 8310 EN
Page 3
Design and principle of operation
1 Design and principle of
operation
The Type 3271 Actuators are primarily used
for attachment to Series 240, 250, 260 and
280 Valves.
Type 3271-5 with a die-cast aluminum
casing and effective diaphragm areas of 60
and 120 cm
Valves and Series 240 Valves.
The Type 3271 Actuator is made up of two
diaphragm cases, a rolling diaphragm and
springs.
Actuators with manual override additionally
4
2
, is mounted to Type 3510
Actuator stem
retracts FE
2 1 1.1
have a handwheel mounted on the top diaphragm case or mounted on the side of the
valve yoke. The handwheel moves the actuator stem over a spindle. The Type 3271 Actuator can be equipped in a special version
with a mechanically adjustable travel stop
(Fig. 7).
The signal pressure creates a force at the diaphragm surface which is balanced by the
springs (6) arranged in the actuator. The
number of springs and their compression
determine the bench range (signal pressure
range) while taking the rated travel into account which is directly proportional to the
signal pressure.
Actuator stem
extends FA
3
5
6
8
9
3
1 Nut
1.1 Nut
2 Actuator stem
3 Vent plug
4 Loading pressure
connection
5 Top diaphragm
case
Fig. 2 · Sectional diagram of Type 3271
6 Springs
7 Diaphragm plate
8 Diaphragm
8.1 Hose clamp
9
8.1
7
a
12
12.1
15
13
16
9 Nuts and bolts
10 Bottom diaphragm case
11 Loading pressure connection
12 Stem seal
12.1 Dry bearing
13 Wiper
15 Ring nut
16 Stem connector
10
11
EB 8310 EN 3
Page 4
Design and principle of operation
A maximum of 30 springs can be installed,
partly fitted inside one another.
In an actuator with the fail-safe action
"Actuator stem extends FA", the loading
pressure is connected to the loading pressure connection (11) to fill the bottom diaphragm chamber with air which causes the
actuator stem to move upwards.
In an actuator with the fail-safe action
"Actuator stem retracts FE", the loading
pressure is connected to the loading pres-
2
1 1.1 6 9
12
12.1
15
13
16
sure connection (4) to fill the top diaphragm
chamber with air which causes the actuator
stem to move downwards.
The stem connector (16) connects the actuator stem (2) to the plug stem of the valve.
Fail-safe action
When the signal pressure fails, the fail-safe
action of the actuator depends on whether
the springs are installed in the top or bottom
diaphragm chamber.
5
3
4
8
11
7
7.1
10
2.1
20 21 22
1 Nut
1.1 Nut
2 Actuator stem
2.1 Bushing
3 Vent plug
3.1 Vent plug
4 Loading press. connection
Actuator stem retracts
5 Top diaphragm case
6 Springs
Fig. 3 · Type 3271-5 Actuators with 120 cm2(top) and 60 cm2(bottom) effective diaphragm area
7 Diaphragm plate
7.1 Metal plate
8 Diaphragm
9 Nuts and bolts
10 Bottom diaphragm case
11 Loading press. connection
12 Stem seal
12.1 Dry bearing
4 EB 8310 EN
Actuator stem extends
21
22
13 Wiper
15 Ring nut
16
16 Stem connector
20 Screw (60 cm
21 Washer (60 cm
22 Sleeve (60 cm
2
)
2
)
2
)
Page 5
Design and principle of operation
Actuator stem extends
When the signal pressure is reduced or the
air supply fails, the springs move the actuator stem downwards and close the valve.
The valve opens when the signal pressure is
increased enough to overcome the force exerted by the springs.
Actuator stem retracts
When the signal pressure is reduced or the
air supply fails, the springs move the actuator stem upwards and open the valve. The
valve closes when the signal pressure is in-
3.1
4
4.1
4
4.1
3
3.1
3
15
7
16
Actuator stem
retracts
3 Loading pressure connection
3.1 Vent plug
4 Loading pressure connection
4.1 Vent plug
15 Ring nut
16 Stem connector
Fig. 4 · Tandem actuator
Actuator stem
extends
creased enough to overcome the force exerted by the springs.
The tandem actuator (Fig. 4) has two diaphragms connected to each other. The signal pressure produces an actuating force
double to that of an actuator with just one
diaphragm.
Actuators with an additional manual over-
ride (Fig. 5) have a handwheel that moves
the actuator stem over a spindle after the
locking mechanism (lock nut) has been disengaged. A side-mounted handwheel (Fig.
8) moves the stem over a bevel or worm
gear.
Note!
Refer to the attached valve’s Mounting and
Operating Instructions to mount or remove
the actuator from the valve.
Actuators with 2800 cm
2
diaphragm area
weigh 450 kg and cannot be mounted onto
the valve on site.
Important!
The pneumatic actuators are designed for a
maximum supply pressure of 6 bar.
To prevent the actuator from being damaged, do not let the supply pressure exceed
the upper spring range value by more than
3 bar when the actuator is used for
flow-switching service (on-off valve) with the
fail-safe action "Actuator stem retracts".
Label actuators that have a reduced supply
pressure with a sticker "max. supply pressure limited to ... bar".
The maximum supply pressure for actuators
with fail-safe action “Actuator stem extends”
and mechanical travel stops should not exceed the upper spring range value by more
than 1.5 bar.
EB 8310 EN 5
Page 6
Operation
2 Operation
Note! Only apply the loading pressure to
the diaphragm chamber that does not contain the springs. It is important for a
troublefree operation of the actuator that the
vent plug (3) is not blocked. Make sure in
versions with a handwheel that the plug
stem can move freely when the valve is being positioned by the pneumatic actuator by
moving the handwheel into a neutral posi-
) .
2
and Fig. 8
tion (Fig. 5 for 240 to 700 cm
for 1400 and 2800 cm
2
2.1 Reversing the operating
direction (fail-safe action)
The operating direction, i.e. fail-safe action,
of pneumatic actuators can be changed.
Prior to proceeding, you must remove the
actuator from the valve.
The fail-safe action "Actuator stem extends"
or "Actuator stem retracts" is specified on
the nameplate with the initials FA and FE on
Type 3271 Actuator or by a symbol on
Type 3271-5 Actuator.
2.1.1 Type 3271
Reversing the fail-safe action "Actuator
stem extends" to "Actuator stem retracts"
(Fig. 2)
1. Unthread nuts and remove the bolts (9)
from the diaphragm cases.
2. Lift off the top diaphragm case (5) and
remove the springs (6).
3. Pull the actuator stem (2) with diaphragm plate (7) and diaphragm (8) out
of the bottom diaphragm case (10).
4. Unscrew nut (1), while holding the nut
(1.1) stationary with a suitable tool.
Caution! Proceed carefully to avoid
damaging the seals of the actuator stem.
Caution!
Do not loosen the nut (1.1) on the actuator
stem. It is painted over to protect it.
If, however, it does become loose, it is essential that the dimension "a" from the top
of the nut to the bottom of the actuator stem
is kept as shown in Fig. 2 and the table
below.
Caution!
To disassemble an actuator with
preloaded actuator springs (recognizable by the long bolts on the diaphragm chambers), always undo the
short bolts first and then unthread
the long bolts slowly and evenly until
the actuator springs are fully decompressed.
6 EB 8310 EN
Actuator cm
1400 230
2800 430
2
120 100.5, or 89 with threaded end
240 98.25
350 107.25
700
Dimension a in mm (Fig. 2)
125 for 15 mm rated travel
(0.4-1.2 bar)
144 for 30 mm and 40 mm
rated travel
Page 7
Operation
5. Lift off the diaphragm plate with diaphragm and replace them in reverse order. Tighten nut (1).
6. Apply lubricant/sealant (order no.
8152-0043) to the actuator stem.
7. Place the diaphragm plate with diaphragm in the top diaphragm case. Insert the springs (6) and slide the lower
diaphragm case over the actuator stem.
8. Screw tight the nuts and bolts of the diaphragm cases.
9. Remove vent plug (3) from top diaphragm case and screw it into the loading pressure connection on the bottom
diaphragm case.
The actuator springs now press against the
diaphragm plate from below and cause the
actuator stem to retract. The loading pressure is connected over the connection (4) to
the top diaphragm chamber. The actuator
stem starts to extend when the signal pressure overcomes the force of the springs.
10.Record the changed fail-safe action on
the nameplate!
Proceed in the same manner for the Type
3271-5 Actuator, but additionally install the
metal plate (7.1).
For the version intended for attachment to
micro-flow valves, additionally install the
bushing (2.1) for the mechanical travel stop.
In Type 3271-52 Actuator with 60 cm
2
diaphragm area, unthread the screw (20) and
then remove the washer (21) and sleeve
(22).
Reversing the fail-safe action "Actuator
stem retracts" to "Actuator stem extends"
(Fig. 2)
1. Unthread nuts and remove the bolts (9)
and lift off the top diaphragm case (5).
2. Pull the diaphragm plate (7) and diaphragm with the actuator stem (2) out of
the bottom diaphragm case (10). Remove the springs (6).
3. Unscrew nut (1), while holding the nut
(1.1) stationary with a suitable tool.
Caution! Proceed carefully to avoid
damaging the seals of the actuator stem.
4. Remove the diaphragm plate with diaphragm and replace them in reverse order. Screw tight nut (1).
5. Coat the actuator stem with sealant/lubricant (order no. 8152-0043) and insert it into the bottom diaphragm chamber along with the diaphragm plate and
diaphragm.
6. Insert springs (6) and place the top diaphragm case back on.
7. Screw tight the nuts and bolts of the diaphragm cases.
8. Remove the vent plug (3) from the bottom loading pressure connection and
place it in the top connection.
The springs which are now pressed from the
top against the diaphragm plate cause the
actuator stem to extend.
The signal pressure is connected via the connection (11) to the bottom diaphragm chamber. The actuator stem starts to retract when
the signal pressure overcomes the force of
the springs.
EB 8310 EN 7
Page 8
Operation
9. Record the changed fail-safe action on
the nameplate!
Proceed in the same manner for the Type
3271-5 Actuator, but additionally install the
metal plate (7.1).
For an actuator intended for a micro-flow
valve, install the bushing (2.1) for the travel
stop.
For Type 3271-52 Actuator with 60 cm
undo the screw (20) and then remove the
washer (21) and sleeve (22).
2
2.1.2 Actuator with handwheel
240, 350 and 700 cm2(Fig. 5) only
1. Undo lock nut (20) and relieve the
springs (6) by turning the handwheel
(17).
2. Loosen threaded pin (26) and unscrew
coupling nut (25) from the coupling
(22).
3. Knock out the clamping sleeve (23) and
remove the ring (24).
4. Unthread the ring nut (28) and lift off the
flange part (21).
Reversing the fail-safe action "Actuator
stem extends" to "Actuator stem retracts"
Proceed as described in section 2.1.1.
4
However, use the word "spindle with nut
(27)" in place of "nut (1)".
After reversing the operating direction:
1. Place the flange part (21) and coupling
nut (25). Then fasten the flange part (21)
with the ring nut (28).
2. Attach the ring (24) with clamping
sleeve (23).
3. Screw coupling nut (25) as far as it will
go onto the coupling (22) and secure
with threaded pins (26).
Reversing the fail-safe action "Actuator
stem retracts" to "Actuator stem extends"
Proceed as described in section 2.1.1.
4
However, use the word "spindle with nut
(27)" in place of "nut (1)".
8 EB 8310 EN
Page 9
Operation
17
20
21
22
23
24
25
3
4
5
6
7
8
6.1
10
11
2
16
26
27
28
8.1
9
After reversing the operating direction:
1. Place the flange part (21) and the coupling nut (25) and then secure flange
part (21) with ring nut (28).
Neutral position
Pointer points to groove in
coupling (22)
Actuator stem retracts
2. Attach the ring (24) with clamping
3. Screw coupling nut (25) as far as it will
Actuator stem extends
sleeve (23).
go onto the coupling (22) and secure
with threaded pins (26).
2 Actuator stem
3 Vent plug
4 Loading press. connection
5 Top diaphragm case
6 Springs
6.1 Additional springs
7 Diaphragm plate
8 Diaphragm
9 Nuts and bolts
8.1 Hose clip
10 Bottom diaphragm case
11 Loading press. connection
16 Stem connector
17 Handwheel
20 Lock nut
21 Flange part
22 Coupling
23 Clamping sleeve
24 Ring
25 Coupling nut
26 Threaded pin
27 Spindle with nut
28 Ring nut
Fig. 5 · Actuators 240, 350 und 700 cm2with handwheel
EB 8310 EN 9
Page 10
Operation
2.2 Replacing the diaphragm
and stem seal
Diaphragm (Fig. 2)
1. Remove the diaphragm plate (7) to-
gether with diaphragm (8) and actuator
stem (2) from the diaphragm case as described in section 2.1.
2. Remove the hose clamp (8.1) and pull it
together with the diaphragm (8) off the
diaphragm plate (7) (not necessary with
Type 3271-5 as the diaphragm is held
in place by the metal plate (7.1)).
3. Stretch the new diaphragm onto the dia-
phragm plate. Fit the hose clamp (8.1)
evenly into the groove intended for it
and tighten. Insert a piece of protective
wear-resistant rubber between the diaphragm and the worm screw of the hose
clamp (jubilee clip) to protect the diaphragm.
4. Reassemble actuator as described in
section 2.1.
12
12.1
Stem seal (Fig. 6)
1. Remove the diaphragm plate (7) to-
gether with the actuator stem (2) from
the diaphragm case as described in
section 2.1.
2. Coat the new stem seal (12) with lubri-
cant/sealant (order no. 8152-0043)
and insert it.
3. If necessary, replace the dry bearing (12.1)
and wiper (13) with new ones as well.
4. Reassemble the actuator as described in
section 2.1.
10 EB 8310 EN
2
13
Fig. 6 · Actuator stem seal
Page 11
2.3 Adjusting the travel stop
Operation
(Type 3271 in special version only)
The travel stop can be adjusted upwards or
downwards to 50 % of the travel.
Downward travel stop
(actuator stem extends)
1. Undo the lock nut (34) and unscrew the
cap (33).
2. Undo the lock nut (31) and adjust the
nut (32) to set required travel stop.
3. Tighten the lock nut (31) again.
Upward travel stop
(actuator stem retracts)
1. Undo the lock nut (34) and adjust the
cap (33) to set the required travel stop.
2. Tighten the lock nut (34) again.
Actuator stem
retracts
33
31
32
34
5
7
2
Actuator stem
extends
2 Actuator stem
7 Diaphragm plate
31 Lock nut
32 Nut
33 Cap
34 Lock nut
Fig. 7 · Travel stop
EB 8310 EN 11
Page 12
Operation
2.4 Manual operation of Type
3271 with side-mounted
handwheel
Note! To operate the handwheel on actua-
tors with 1400 and 2800 cm
areas, do not use any additional tools such
as a lever or wrench.
2
diaphragm
2.4.1 Normal operation with the
handwheel locked
The handwheel is not used. The valve is positioned by the pneumatic signal pressure
applied to the valve.
To achieve this, the pin next to the actuator
stem must be in the neutral position:
The pin must sink into the flange so far that
its groove is aligned with the top of the
flange.
Pull the locking knob on the side all the
4
way out and turn it to unlock the
handwheel.
Turn the handwheel counterclockwise
4
(direction Auf/Open/Ouvert), the pin
sinks into the flange.
Initially, the handwheel is easy to turn
and after a certain point of pressure is
reached, the valve starts to open.
On reaching the final position at the
4
stop, do not turn the handwheel any further by force.
Caution! Risk of damage.
After finishing manual operation, turn
4
the handwheel to bring the pin back into
the neutral position again.
Turn the locking knob until it engages to
4
lock the handwheel again.
2.4.3 Actuator stem retracts upon
air supply failure
If this is not case:
Pull the locking knob on the side all the
4
way out and turn it to unlock the
handwheel.
Turn the handwheel until the pin reaches
4
the neutral position.
Turn the locking knob until it engages to
4
lock the handwheel again.
The easiest way to adjust the handwheel is
with the valve in the fail-safe position.
2.4.2 Actuator stem extends upon
air supply failure
The manual override must overcome the
force of the actuator springs to open the
valve.
The manual override must overcome the
force of the actuator springs to close the
valve.
Pull the locking knob on the side all the
4
way out and turn it to unlock the
handwheel.
Turn the handwheel clockwise (direction
4
Zu/Close/Fermé), the pin emerges from
the flange.
Initially, the handwheel is easy to turn
and after a certain point of pressure is
reached, the valve starts to close.
On reaching the final position at the
4
stop, do not turn the handwheel any further by force.
Caution! Risk of damage.
12 EB 8310 EN
Page 13
After finishing manual operation, turn
4
the handwheel to bring the pin back into
the neutral position again.
Turn the locking knob until it engages to
4
lock the handwheel again.
2.4.4 Actuator stem extends when
supply air is applied
The manual override must overcome the
force of the actuator springs to open the
valve.
Do not close the valve any further than before unlocking the handwheel.
Pull the locking knob on the side all the
4
way out and turn it to unlock the
handwheel.
Turn the handwheel counterclockwise
4
(direction Auf/ Open/Ouvert), the pin
sinks into the flange.
Initially, the handwheel is easy to turn
and the pin’s position does not move
anymore. After a certain point of pressure is reached (how long depends on
the valve travel), the valve starts to open.
Operation
2.4.5 Actuator stem retracts when
supply air is applied
The manual override must overcome the
force of the actuator springs to close the
valve.
Do not open the valve any further than before unlocking the handwheel.
Pin with groove
Neutral
position
On reaching the final position at the
4
stop, do not turn the handwheel any further by force.
Caution! Risk of damage.
After finishing manual operation, turn
4
the handwheel to bring the pin back into
the neutral position again.
Turn the locking knob until it engages to
4
lock the handwheel again.
Locking knob
(locked)
Version in this drawing
for 80 mm travel
Fig. 8 · Side-mounted handwheel
EB 8310 EN 13
Page 14
Description of nameplate
Pull the locking knob on the side all the
4
way out and turn it to unlock the
handwheel.
Turn the handwheel clockwise (direction
4
Zu/Close/Fermé), the pin emerges from
the flange.
After a certain point of pressure is
reached, the valve starts to close.
On reaching the final position at the
4
stop, do not turn the handwheel any further by force.
Caution! Risk of damage.
After finishing manual operation, turn
4
the handwheel to bring the pin back into
the neutral position again.
Turn the locking knob until it engages to
4
lock the handwheel again.
3 Description of nameplate
SAMSON
1 Type designation
2 Modification index
3 Effective diaphragm area
4 Operating direction:
Actuator stem extends FA
Actuator stem retracts FE
5 Travel
6 Bench range (spring range)
7 Bench range with preloaded springs
1
234
657
VFH
Fig. 9 · Nameplate
14 EB 8310 EN
Page 15
4 Customer inquiries
Please specify the following details on making inquires:
Type and model number
4
Effective diaphragm area
4
Bench range (spring range) in bar
4
Actuator version and its operating direc-
4
tion
Customer inquiries
Dimensions and weights
Refer to the Data Sheets T 8310-1 EN or
T 8310-2 EN for the different actuator versions.
EB 8310 EN 15
Page 16
SAMSON AG ⋅ MESS- UND REGELTECHNIK
Weismüllerstraße 3 ⋅ 60314 Frankfurt am Main ⋅ Germany
Phone +49 69 4009-0 ⋅ Fax +49 69 4009-1507
Internet: http://www.samson.de
EB 8310 EN
S/Z 2004-11
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