Samson 3271 Service manual
Pneumatic Actuator
Type 3271
Mounting and
Operating Instructions
EB 8310 EN
Edition October 2004
Fig. 1 · Type 3271 Actuators
Type 3271
Type 3271-5
Type 3271-52
Type 3271 with handwheel
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
2EB 8310 EN
Contents Safety instructions
General safety instructions
4
Assembly, start-up and operation of the device may only be performed by
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.
4
Any hazards which could be caused by the signal pressure and moving
parts of the actuator are to be prevented by means of appropriate
measures.
4
Proper shipping and appropriate storage are assumed.
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 cm2, is mounted to Type 3510
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
have a handwheel mounted on the top dia-
phragm case or mounted on the side of the
valve yoke. The handwheel moves the actua-
tor stem over a spindle. The Type 3271 Ac-
tuator can be equipped in a special version
with a mechanically adjustable travel stop
(Fig. 7).
The signal pressure creates a force at the di-
aphragm 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 ac-
count which is directly proportional to the
signal pressure.
EB 8310 EN 3
Design and principle of operation
Fig. 2 · Sectional diagram of Type 3271
4
3
2 1 1.1 5
6
8.1
8
9
7
10
11
12
12.1
15
13
16
a
9
3
1 Nut
1.1 Nut
2 Actuator stem
3 Vent plug
4 Loading pressure
connection
5 Top diaphragm
case
6 Springs
7 Diaphragm plate
8 Diaphragm
8.1 Hose clamp
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
Actuator stem
retracts FE
Actuator stem
extends FA
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 pres-
sure connection (11) to fill the bottom dia-
phragm 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-
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 actua-
tor 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.
4EB 8310 EN
Design and principle of operation
Fig. 3 · Type 3271-5 Actuators with 120 cm
2
(top) and 60 cm
2
(bottom) effective diaphragm area
4
8
11
7
7.1
16
15 13
12.1
12
3
5
2
20 21 22
1 1.1 6 9
10 2.1
21
22
16
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
7 Diaphragm plate
7.1 Metal plate
8 Diaphragm
9 Nuts and bolts
10 Bottom diaphragm case
11 Loading press. connection
Actuator stem extends
12 Stem seal
12.1 Dry bearing
13 Wiper
15 Ring nut
16 Stem connector
20 Screw (60 cm2)
21 Washer (60 cm2)
22 Sleeve (60 cm2)
Actuator stem extends
When the signal pressure is reduced or the
air supply fails, the springs move the actua-
tor stem downwards and close the valve.
The valve opens when the signal pressure is
increased enough to overcome the force ex-
erted by the springs.
Actuator stem retracts
When the signal pressure is reduced or the
air supply fails, the springs move the actua-
tor stem upwards and open the valve. The
valve closes when the signal pressure is in-
creased enough to overcome the force ex-
erted by the springs.
The tandem actuator (Fig. 4) has two dia-
phragms connected to each other. The sig-
nal 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 dis-
engaged. 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 dam-
aged, 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 pres-
sure limited to ... bar".
The maximum supply pressure for actuators
with fail-safe action “Actuator stem extends”
and mechanical travel stops should not ex-
ceed the upper spring range value by more
than 1.5 bar.
EB 8310 EN 5
Design and principle of operation
Fig. 4 · Tandem actuator
3.1
3
4
4
4.1
4.1
15
16
3.1
3
7
3 Loading pressure connection
3.1 Vent plug
4 Loading pressure connection
4.1 Vent plug
15 Ring nut
16 Stem connector
Actuator stem
retracts
Actuator stem
extends
2 Operation
Note! Only apply the loading pressure to
the diaphragm chamber that does not con-
tain 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 be-
ing positioned by the pneumatic actuator by
moving the handwheel into a neutral posi-
tion (Fig. 5 for 240 to 700 cm
2
and Fig. 8
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.
Caution!
To disassemble an actuator with
preloaded actuator springs (recog-
nizable by the long bolts on the dia-
phragm chambers), always undo the
short bolts first and then unthread
the long bolts slowly and evenly until
the actuator springs are fully decom-
pressed.
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 dia-
phragm 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 es-
sential 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.
Actuator cm2Dimension a in mm (Fig. 2)
120 100.5, or 89 with threaded end
240 98.25
350 107.25
700
125 for 15 mm rated travel
(0.4-1.2 bar)
144 for 30 mm and 40 mm
rated travel
1400 230
2800 430
6EB 8310 EN
Operation
5. Lift off the diaphragm plate with dia-
phragm and replace them in reverse or-
der. Tighten nut (1).
6. Apply lubricant/sealant (order no.
8152-0043) to the actuator stem.
7. Place the diaphragm plate with dia-
phragm in the top diaphragm case. In-
sert the springs (6) and slide the lower
diaphragm case over the actuator stem.
8. Screw tight the nuts and bolts of the dia-
phragm cases.
9. Remove vent plug (3) from top dia-
phragm case and screw it into the load-
ing 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 pres-
sure is connected over the connection (4) to
the top diaphragm chamber. The actuator
stem starts to extend when the signal pres-
sure 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 cm2dia-
phragm 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 dia-
phragm with the actuator stem (2) out of
the bottom diaphragm case (10). Re-
move 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 dia-
phragm and replace them in reverse or-
der. Screw tight nut (1).
5. Coat the actuator stem with sealant/lu-
bricant (order no. 8152-0043) and in-
sert it into the bottom diaphragm cham-
ber along with the diaphragm plate and
diaphragm.
6. Insert springs (6) and place the top dia-
phragm case back on.
7. Screw tight the nuts and bolts of the dia-
phragm cases.
8. Remove the vent plug (3) from the bot-
tom 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 con-
nection (11) to the bottom diaphragm cham-
ber. The actuator stem starts to retract when
the signal pressure overcomes the force of
the springs.
EB 8310 EN 7
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 cm2
undo the screw (20) and then remove the
washer (21) and sleeve (22).
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"
4Proceed as described in section 2.1.1.
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"
4Proceed as described in section 2.1.1.
However, use the word "spindle with nut
(27)" in place of "nut (1)".
8EB 8310 EN
Operation
After reversing the operating direction:
1. Place the flange part (21) and the cou-
pling nut (25) and then secure flange
part (21) with 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).
EB 8310 EN 9
Operation
Fig. 5 · Actuators 240, 350 und 700 cm
2
with handwheel
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
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
Actuator stem retracts Actuator stem extends
Neutral position
Pointer points to groove in
coupling (22)
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 de-
scribed 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 dia-
phragm and the worm screw of the hose
clamp (jubilee clip) to protect the dia-
phragm.
4. Reassemble actuator as described in
section 2.1.
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
Operation
Fig. 6 · Actuator stem seal
12
12.1
2
13
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