Samsomatic 3776 series Service manual

Edition: June 2014 EB 8368 EN
Mounting and Operating Instructions
Limit Switch Type 3776
Fig. 1

EB 8368 EN – 2 –
Contents
General notes 3
Model number and device index 3
Mounting 3
Mounting to SAMSON Type 3278 Rotary Actuators 4
Mounting to rotary actuators according to VDI/VDE 3845 (2004-09) – fixing level 1 6
Mounting to rotary actuators according to VDI/VDE 3845 (2004-09) – fixing level 2 8
Mounting to SAMSON Type 3277 Linear Actuators 10
Mounting to SAMSON Type 3277-5 Linear Actuators 12
(external routing of the loading pressure)
Mounting to SAMSON Type 3277-5 Linear Actuators 14
(internal routing of the loading pressure)
Mounting to SAMSON Type 324X Control Valves with rib according to DIN EN 60534-6-1 16
Air connection 18
Air supply 18
Filter elements for air supply 19
Exhaust air filter and degree of protection 20
Restrictors 20
Electrical connection 21
Connecting cables 21
Equipment for use in zone 2/zone 22 21
Connection diagrams for terminal block 22
Connection diagrams for plug-type connectors according to EN 175301-803 23
Connection diagrams for plug-type connectors (manufactured by Harting) 24
Connection diagrams for round connectors (manufactured by Binder) 25
AS-Interface module (version 2011) 26
Pilot valve/manual override 28
Contacts 29
Switching point shift due to changes in temperature 29
Inductive pick-ups 30
Inductive double proximity switch 31
Electric microswitches 32
Servicing explosion-protected devices 33
Maintenance, calibration and work on equipment 33
Certifications 34
EC Type Examination Certificate PTB 98 ATEX 2072 34
Statement of Conformity PTB 02 ATEX 2007 X 46
Certificate of Compliance (FM Approvals) 50
Addendum 53
Installation manual for apparatus approved by FM for use in hazardous locations 53

– 3 – EB 8368 EN
General notes
The device is to be assembled, started up or
operated only by trained and experienced per-
sonnel familiar with the product. According to
these mounting and operating instructions,
trained personnel is referred to as individuals
who are able to judge the work they are
assigned to and recognize possible dangers
due to their specialized training, their knowl-
edge and experience as well as their knowl-
edge of the applicable standards.
Explosion-protected versions of this device are
to be operated only by personnel who has un-
dergone special training or instructions or who
is authorized to work on explosion-protected
devices in hazardous areas.
Any hazards that could be caused in the valve
by the process medium, the signal pressure or
by moving parts are to be prevented by means
of the appropriate measures.
If inadmissible motions or forces are produced
in the pneumatic actuator as a result of the sup-
ply pressure level, it must be restricted using a
suitable supply pressure reducing station.
Proper shipping and appropriate storage are
assumed.
For technical data, ordering data, spare parts
and accessories see Data Sheet T 3776 EN.
Model number and device index
The model number and the device index are
shown on the nameplate:
Mounting
Before mounting to actuators, all
relevant parts of the plant must be
depressurized.
Due to the high surface resistance, avoid elec-
trostatic charging when mounting and servic-
ing the devices in hazardous areas.
Do not loosen enameled screws in or on the
housing.
Using mounting kits, the devices can be mount-
ed to rotary actuators, linear actuators and
control valves with ribs. Then the relevant
mounting instructions must be observed (see
pages 3 to 17).
To prevent water from entering the device, do
not mount the devices to rotary actuators or
control valves with ribs with the bottom of the
enclosure facing upwards. Install the exhaust
air filter in the enclosure cover and the cable
gland to face downwards or, if this is not pos-
sible, horizontally.
The devices can be mounted in any desired po-
sition to SAMSON Type 3277 Linear Actuators.
The required degree of protection
according to IEC 60529:1989 can
only be guaranteed when the enclo-
sure cover is mounted, the exhaust air filters
are installed and the connections are installed
properly.
Note: Devices with index 1 or lower have a
black enclosure cover with polyamide window.
Devices with device index 2 and higher have a
transparent polycarbonate enclosure cover.
On mounting make sure that at least 300 mm
space is left above the enclosure cover.
In locations where there is a risk of mechanical
damage to the enclosure, the enclosure must be
fitted with additional protection to fulfill the
requirements in clause 6 of EN 61241-0: 2006
“Electrical apparatus for use in the presence of
combustible dust“.


Device indexModel number
3776-XXXXXXXXXXXXXX XX

EB 8368 EN – 4 –
Mounting to SAMSON Type 3278
Rotary Actuators
For mounting to SAMSON Type 3278 Rotary
Actuators (see Data Sheet T 8321 EN and
Mounting and Operating Instructions
EB 8321 EN), a mounting kit is required (see
Fig. 2).
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
The outlet bore on the bottom of the booster
valve must be sealed by a threaded pin (deliv-
ered state).
Devices with
Types 3776-XXXXXX10/-XXXXXX12
3/2-way Booster Valve
The exhaust air feedback from the rotary actu-
ator is implemented as follows:
– Connect the spring chamber of the rotary
actuator using a connecting line to the con-
nection 4 of the booster valve.
– If no exhaust air feedback is used, seal con-
nection 4 of the booster valve using a
threaded plug .
Mounting
1Fasten plate using two hexagon socket
head screws to the flange of the rotary
actuator.
2Insert O-rings into the grooves of the
threaded bolts of the flange plate .
3Fasten flange plate to the flange of the
rotary actuator using four hexagon screws
. Make sure the four hexagon screws 
are only tightened slightly to allow the
flange plate to be aligned when attach-
ing the enclosure.
4Place follower clamp through the flange
plate into the slot of the plate on the
rotary actuator.
5Unscrew enclosure cover from the device.
6Place the enclosure on the threaded bolts of
the flange plate . Make sure that the shaft
trunnion on the device is aligned so that it
engages in the middle of the slot int the fol-
lower clamp .
7Fasten flange plate onto the flange of the
rotary actuator by tightening the four hexa-
gon screws .
8Fasten the enclosure using two hexagon
socket head screws , two split washers 
and two washers .
9Place the indicating cap on the cam
holder and turn it until it engages.
10 Attach enclosure cover onto the device.

– 5 – EB 8368 EN
Mounting to SAMSON Type 3278 Rotary Actuators
Fig. 2
Mounting kit for SAMSON Type 3278 Rotary Actuators
Order no. 1400-7216 1400-7217
2Hexagon socket head screw Diaphragm area 160 cm2Diaphragm area 320 cm2
ISO 4762 –M 612
2Split washer – form B 6
2Washer ISO 7089-6 – 6
2O-ring 7.51.5
1Flange plate
4Hexagon screw EN 24017 – M 512
1Follower clamp
1Plate
2Hexagon socket head screw
ISO 4762 – M 410
1Indicating cap
1Fixing ring (only for mounting kit 1400-7217)
1Threaded plug 1
/4“
Bottom view of the device

EB 8368 EN – 6 –
Mounting to rotary actuators
according to VDI/VDE 3845 (2004-09) –
fixing level 1
For mounting to rotary actuators according to
VDI/VDE 3845 (2009-04) – fixing level 1, a
mounting kit is required (see Fig. 3).
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
The outlet bore on the bottom of the booster
valve must be sealed by a threaded pin (deliv-
ered state).
Devices with
Types 3776-XXXXXX10/-XXXXXX12
3/2-way Booster Valve
The exhaust air feedback from the rotary actu-
ator is implemented as follows:
– Connect the spring chamber of the rotary
actuator using a connecting line to the con-
nection 4 of the booster valve.
– If no exhaust air feedback is used, seal con-
nection 4 of the booster valve using a
threaded plug .
Mounting
1Fasten bracket delivered by the actuator
manufacturer using four hexagon screws to
the flange of the rotary actuator. Make sure
the four hexagon screws are only tightened
slightly to allow the bracket to be aligned
when attaching the enclosure.
2Insert O-rings into the grooves of the
threaded bolts of the flange plate .
3Fasten flange plate to the bracket using
two hexagon screws and two hexagon
nuts .
4Place follower clamp into the slot of the
shaft trunnion on the rotary actuator.
5Unscrew enclosure cover from the device.
6Place the enclosure on the threaded bolts of
the flange plate . Make sure that the shaft
trunnion on the device is aligned so that it
engages in the middle of the slot in the fol-
lower clamp .
7Fasten bracket onto the flange of the rotary
actuator by tightening the four hexagon
screws.
8Fasten enclosure using two hexagon socket
head screws , two split washers and
two washers .
9Place indicating cap on the cam holder
and turn it until it engages.
10 Attach the enclosure cover onto the device.

– 7 – EB 8368 EN
Mounting to rotary actuators according to VDI/VDE 3845 (2004-09) – fixing level 1
Fig. 3
Mounting kit for rotary actuators according to VDI/VDE 3845 (2004-09) – fixing level 1
Order no. 1400-7041
2Hexagon socket head screw
ISO 4762 – M 612
2Split washer – form B 6
2Washer ISO 7089-6 – 6
2O-ring 7.51.5
1Flange plate
1Follower clamp
2Hexagon screw EN 24017 – M 612
2Hexagon nut EN 24032 – M 6
1Indicating cap
1Threaded plug 1
/4“
Bottom view of the device

EB 8368 EN – 8 –
Mounting to rotary actuators
according to VDI/VDE 3845 (2004-09) –
fixing level 2
For mounting to rotary actuators according to
VDI/VDE 3845 (2004-09) – fixing level 2, a
mounting kit is required (see Fig. 4).
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
The outlet bore on the bottom of the booster
valve must be sealed by a threaded pin (deliv-
ered state).
Devices with
Types 3776-XXXXXX10/-XXXXXX12
3/2-way Booster Valve
The exhaust air feedback from the rotary actu-
ator is implemented as follows:
– Connect the spring chamber of the rotary
actuator using a connecting line to the con-
nection 4 of the booster valve.
– If no exhaust air feedback is used, seal con-
nection 4 of the booster valve using a
threaded plug .
Mounting
1Insert O-rings into the grooves of the
threaded bolts of the flange plate .
2Fasten flange plate to the flange of the
rotary actuator using four hexagon
screws . Make sure the four hexagon
screws are only tightened slightly to al-
low the flange plate to be aligned when
attaching the enclosure.
3Unscrew enclosure cover from the device.
4Place enclosure on the threaded bolts of the
flange plate . Make sure that the shaft
trunnion on the device is aligned so that it
engages in the middle of the slot in the ro-
tary actuator.
5Fasten flange plate onto the flange of the
rotary actuator by tightening the four hexa-
gon screws .
6Fasten enclosure using two hexagon socket
head screws , two split washers and
two washers .
7Place indicating cap on the cam holder
and turn it until it engages.
8Attach the enclosure cover onto the device.

– 9 – EB 8368 EN
Mounting to rotary actuators according to VDI/VDE 3845 (2004-09) – fixing level 2
Fig. 4
Mounting kit for rotary actuators according to VDI/VDE 3845 (2004-09) – fixing level 2
Order no. 1400-7043 1400-7186 1400-7212 1400-7210
2Hexagon socket head screw Size 1 Size 2 Size 3 Size 4
ISO 4762 – M 612 Hole spacing A
2Split washer – form B 6 80 mm 80 mm 130 mm 130 mm
2Washer ISO 7089-6 – 6 Shaft trunnion length B
2O-ring 62
1Flange plate 20 mm 30 mm 30 mm 50 mm
4Hexagon screw EN 24017 – M 512
1Indicating cap
1Threaded plug 1
/4“
Bottom view of the device

EB 8368 EN – 10 –
Mounting
1Use a screwdriver to turn the threaded plug
and break it out of the bottom of the enclo-
sure.
2Insert molded seal into the groove in the
bottom of the enclosure.
3Place follower clamp together with exter-
nal spring onto shaft trunnion and secure in
place using a snap ring .
4Fasten flange plate together with stuck-
on flat seal flush-right onto linear actua-
tor yoke using two hexagon screws .
Place washer  and O-ring under the
left hexagon screw .
5 Mounting without positioner/
mounting with SAMSON Type 376X or 378X
Positioner:
Attach clamp onto linear actuator stem.
Mounting with SAMSON Type 373X
Positioner:
Fasten clamp from the positioner mounting
kit together with fixing screw and follower
pin onto linear actuator stem.
6Unscrew enclosure cover from the device.
7Place enclosure on the threaded bolts of the
flange plate . Make sure that the shaft
trunnion is aligned so that the follower pin
of the clamp /fixing screw engages
exactly into the slot in the follower
clamp .
8Fasten enclosure using two hexagon socket
head screws , two split washers and
two washers .
9Attach the enclosure cover onto the device.
10 Mounting without positioner:
Replace exhaust air filter in the enclosure
cover with threaded plug as the air
purging of the enclosure is performed over
the cover on the linear actuator.
Fasten the cover at the back of the linear
actuator yoke and thread in exhaust air fil-
ter.
Mounting with SAMSON Type 373X, 376X
or 378X Positioner:
Mount positioner onto the back of the linear
actuator yoke as described in the mounting
and operating instructions.
The cover is not required.
Mounting to SAMSON Type 3277
Linear Actuators
For mounting to SAMSON Type 3277 Linear
Actuators (see Data Sheet T 8310-1/-2 EN and
Mounting and Operating Instructions EB 8310
-1/-2 EN), a mounting kit is required (see
Fig. 5).
A SAMSON Type 373X, 376X or 378X Pos-
itioner can be mounted at the same time.
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
The outlet bore on the bottom of the booster
valve must be sealed by a threaded pin (deliv-
ered state).
Insert O-ring into the outlet bore on the bot-
tom of the booster valve.
Devices with
Types 3776-XXXXXX10/-XXXXXX12
3/2-way Booster Valve
The exhaust air feedback from the linear actu-
ator is implemented as follows:
– Connect the spring chamber of the linear
actuator using a connecting line to the con-
nection 4 of the booster valve.
– If no exhaust air feedback is used, seal con-
nection 4 of the booster valve using a
threaded plug .

– 11 – EB 8368 EN
Mounting to SAMSON Type 3277 Linear Actuators
Fig. 5
Mounting kit for SAMSON Type 3277 Linear Actuators
Order no. 1400-7220 1400-7221
1Molded seal Diaphragm area 240/350 cm2Diaphragm area 700 cm2
1Follower clamp
1Snap ring 50.8
1Flange plate
1Flat seal
2Hexagon screw EN 24017 – M 512
1Washer ISO 7089 – 5
1O-ring 51.2
1Clamp (for mounting without positioner/
with SAMSON Type 376X or 378X Positioner)
1Fixing screw and follower pin (for mounting with
SAMSON Type 373X Positioner)
2Hexagon socket head screw
ISO 4762 – M 612
2Split washer – form B 6
2Washer ISO 7089 – 6
1Cover (for mounting without positioner)
2Threaded plug 1
/4“
1O-ring 42
Bottom view of the device

EB 8368 EN – 12 –
Mounting
1Use a screwdriver to turn the threaded plug
and break it out of the bottom of the enclo-
sure.
2Insert molded seal into the groove in the
bottom of the enclosure.
3Place follower clamp together with exter-
nal spring onto the shaft trunnion and se-
cure in place using a snap ring .
4Fasten flange plate together with stuck-
on flat seal flush-right onto the linear ac-
tuator yoke using two hexagon screws .
Place washer  and O-ring under the
left hexagon screw .
5 Mounting without positioner/
mounting with SAMSON Type 376X or 378X
Positioner:
Attach clamp onto the linear actuator
stem.
Mounting with SAMSON Type 373X
Positioner:
Fasten clamp from the positioner mounting
kit together with fixing screw and follower
pin onto linear actuator stem.
6Unscrew enclosure cover from the device.
7Place enclosure on the threaded bolts of the
flange plate . Make sure that the shaft
trunnion is aligned so that the follower pin
of the clamp /fixing screw engages
exactly into the slot in the follower
clamp .
8Fasten enclosure using two hexagon socket
head screws , two split washers and
two washers .
9Attach the enclosure cover onto the device.
10 Mounting without positioner:
Replace exhaust air filter in the enclosure
cover with the threaded plug as air
purging of the enclosure is performed over
the cover on the linear actuator.
Fasten the cover at the back of the linear
actuator yoke and thread in exhaust air
filter.
Mounting with SAMSON Type 373X, 376X
or 378X Positioner:
Mount the positioner onto the back of the
linear actuator yoke as described in the
mounting and operating instructions.
The cover is not required.
Mounting to SAMSON Type 3277-5
Linear Actuators
(external routing of the loading pressure)
For mounting to SAMSON Type 3277-5 Linear
Actuators with external routing of the loading
pressure (see Data Sheet T 8310-1/-2 EN and
Mounting and Operating Instructions EB 8310
-1/-2 EN), a mounting kit is required (see
Fig. 6).
A SAMSON Type 373X, 376X or 378X Pos-
itioner can be mounted at the same time.
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
The outlet bore on the bottom of the booster
valve must be sealed by a threaded pin (deliv-
ered state).
Insert O-ring into the outlet bore on the bot-
tom of the booster valve.
Devices with
Types 3776-XXXXXX10/-XXXXXX12
3/2-way Booster Valve
Seal connection 4 of the booster valve using a
threaded plug .

– 13 – EB 8368 EN
Mounting to SAMSON Type 3277-5 Linear Actuators (external) without positioner
Fig. 6
Mounting kit for SAMSON Type 3277-5 Linear Actuators (external)
Order no. 1400-7219
1Molded seal Diaphragm area 120 cm2
1Follower clamp
1Snap ring 50.8
1Flange plate
1Flat seal
2Hexagon screw EN 24017 – M 512
1Washer ISO 7089 – 5
1O-ring 51,2
1Clamp (for mounting without positioner/
with SAMSON Type 376X or 378X Positioner)
1Fixing screw and follower pin (for mounting with
SAMSON Type 373X Positioner)
2Hexagon socket head screw
ISO 4762 – M 612
2Split washer – form B 6
2Washer ISO 7089 – 6
1Cover (for mounting without positioner)
2Threaded plug 1
/4“
1O-ring 42
Bottom view of the device

EB 8368 EN – 14 –
Mounting to SAMSON Type 3277-5
Linear Actuators
(internal routing of the loading pressure)
For mounting to SAMSON Type 3277-5 Linear
Actuator with internal routing of the loading
pressure (see Data Sheet T 8310-1/-2 EN and
Mounting and Operating Instructions EB 8310
-1/-2 EN), a mounting kit is required (see
Fig. 7).
A SAMSON Type 373X, 376X or 378X Pos-
itioner can be mounted at the same time.
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
Only these devices can be mounted to SAMSON
Type 3277-5 Linear Actuators with internal
routing of the loading pressure. The loading
pressure is routed over holes in the yoke and a
switchover plate either to the top or bottom di-
aphragm chamber.
– Unscrew threaded pin out of the outlet bore
on the bottom of the booster valve.
– Seal connection 2 of the booster valve using
a screw plug and the O-ring .
– Seal connection 4 of the booster valve using
a threaded plug .
Mounting
1Use a screwdriver to turn the threaded plug
and break it out of the bottom of the enclo-
sure.
2Insert molded seal into the groove in the
bottom of the enclosure.
3Place follower clamp together with the
external spring onto the shaft trunnion and
secure in place using a snap ring .
4Fasten flange plate together with stuck-
on flat seal flush-right onto the yoke of
the linear actuator using two hexagon
screws . Place the washer  and O-ring
under the left hexagon screw .
5Place seal  through the hole of the flange
plate into the loading pressure connec-
tion.
6 Mounting without positioner/
mounting with SAMSON Type 376X or 378X
Positioner:
Attach clamp onto the linear actuator
stem.
Mounting with SAMSON Type 373X
Positioner:
Fasten clamp from the positioner mounting
kit together with fixing screw and follower
pin onto linear actuator stem.
7Unscrew enclosure cover from the device.
8Place enclosure on the threaded bolts of the
flange plate . Make sure that the shaft
trunnion is aligned so that the follower pin
of the clamp /fixing screw engages
exactly into the slot in the follower
clamp .
9Fasten the enclosure using two hexagon
socket head screws , two split washers 
and two washers .
10 Attach the enclosure cover onto the device.
11 Mounting without positioner:
Replace exhaust air filter in the enclosure
cover with the threaded plug as air
purging of the enclosure is performed over
the cover on the linear actuator.
Fasten the cover at the back of the linear
actuator yoke and thread in exhaust air
filter.
Mounting with SAMSON Type 373X, 376X
or 378X Positioner:
Mount the positioner onto the back of the
linear actuator yoke as described in the
mounting and operating instructions.
The cover is not required.

– 15 – EB 8368 EN
Mounting to SAMSON Type 3277-5 Linear Actuators (internal) without positioner
Fig. 7
Mounting kit for SAMSON Type 3277-5 Linear Actuator (internal)
Order no. 1400-7222 1400-7223
1Molded seal Connection G 1
/4Connection NPT 1 /4
1Follower clamp Diaphragm area 120 cm2
1Snap ring 50.8
1Flange plate
1Flat seal
2Hexagon screw EN 24017 – M 512
1Washer ISO 7098 – 5
1O-ring 51.2
1Clamp (for mounting without positioner/
with SAMSON Type 376X or 378X Positioner)
1Fixing screw and follower pin (for mounting with
SAMSON Type 373X Positioner)
2Hexagon socket head screw
ISO 4762 – M 612
2Split washer – form B 6
2Washer ISO 7089 – 6
1Cover
2Threaded plug 1
/4“
1Seal 13 mm
1Screw plug DIN 908 – 1
/4“
1O-ring 141 (only for G 1
/4)
Bottom view of the device




 









EB 8368 EN – 16 –
Mounting
1Screw two bolts into the stem connector
between the actuator stem and plug stem.
2Fasten follower plate to the bolts us-
ing two hexagon screws and two disc
springs .
3Fasten bracket to the rib of the control
valve using a hexagon screw and wash-
er . Align the middle of the bracket 
with the 50 % mark of the travel indicator
scale.
4Unscrew enclosure cover from the device.
5Place bushing on the shaft trunnion of
the device and fasten it using two self-tap-
ping screws .
6Insert follower pin in the follower clamp 
depending on the valve travel (17/
25/35 mm). Fasten it using a hexagon
nut.
7Place follower clamp onto the threaded
trunnion of bushing . Fasten it with hexa-
gon nut and split washer .
8Align follower clamp in the horizontal
direction.
9Place enclosure on the threaded bolts of the
bracket . Make sure the pin engages ex-
actly into the slot of the follower plate . If
this is not possible, undo the hexagon screw
and realign the bracket .
10 Fasten enclosure using two hexagon socket
head screws , two split washers and
two washers .
11 Attach the enclosure cover onto the device.
Mounting to SAMSON Type 324X
Control Valves with rib according to
DIN EN 60534-6-1
For mounting to SAMSON Type 324X Control
Valves (see Data Sheet T 8015 EN and
Mounting and Operating Instructions
EB 8015 EN) a mounting kit is required (see
Fig. 8).
Note: Mounting to SAMSON Types 324X,
325X and 328X Control Valves with nominal
size above DN 100 can be done in the same
way. For mounting to control valves with a
travel above 5 mm special mounting kits are
required. Therefore, type, nominal size and
travel of the control valve must be specified in
the order.
On mounting, the following instructions must
be observed.
Devices with Type 3776-XXXXXX10
3/2-way Booster Valve
The outlet bore on the bottom of the booster
valve must be sealed with a threaded pin (de-
livered state).
Devices with
Types 3776-XXXXXX10/-XXXXXX12
3/2-way Booster Valve
The exhaust air feedback from the linear actu-
ator is implemented as follows:
– Connect the spring chamber from the linear
actuator using a connecting line to the con-
nection 4 of the booster valve.
– If no exhaust air feedback is used, seal con-
nection 4 of the booster valve using a
threaded plug.

– 17 – EB 8368 EN
Mounting to SAMSON Type 324X Control Valves with ribs according to DIN EN 60534-6-1
Fig. 8
Mounting kit for SAMSON Type 324X Control Valves
Order no. 1400-7730
1Bushing Nominal size DN 15 to 100
2Self-tapping screw 2.510
1Follower clamp
1Hexagon nut ISO 4035 – M 6
1Split washer – form B 6
2Bolt
1Follower plate
2Hexagon screw ISO 4017 – M 48
2Disk spring DIN 2093 – form B 8
1Bracket
1Hexagon screw ISO 4017 – M 820
1Washer ISO 7089 – 9
2Hexagon socket head screw
ISO 4762 – M 610
2Split washer – form B 6
2Washer ISO 7089 – 6
Bottom view of the device

EB 8368 EN – 18 –
Air connection
For devices with pilot valve, the air
supply pipes and screw joints may
only be laid and assembled by ex-
perienced personnel. They must be regularly
checked for leaks and damage and, if necess-
ary, repaired. Before starting any repair
work, all supply pipes which are to be opened
must be depressurized.
The air supply must not exeed the maximum
permissible pressure.
The air connections on the connection block or
booster valve are G (NPT) 1 /
4tapped holes.
To connect the actuator preferably angle con-
nectors for pipe 61 (external diameterwall
thickness) or hose 41 (internal diameter wall
thicknesss) shall be used. Larger nominal sizes
must be used for supply pipe lengths over two
meters.
Note: The KVS value of a pressure reducer con-
nected upstream must be at least 1.6 times
larger than the KVS value of the device!
The exhaust air connection must be protected
against water and dirt entering by using a fil-
ter or other suitable countermeasures.
Air supply
Medium
Instrument air, free of corrosive particles, or ni-
trogen
Pressure
2.2 to 6.0 bar

Quality of compressed air according to
ISO 8573-1
Particle size Oil contents Pressure
and density dew point
Class 4 Class 3 Class 3
5 µm 1 mg/m320 °C or at
and least 10 K
1000/m3below the
lowest ambient
temperature to
be expected
Note for using nitrogen:
When the devices are to be mount-
ed in closed, unventilated rooms,
the exhaust air of pilot valves or
booster valves must be vented to the outside
over a central pipe.


– 19 – EB 8368 EN
Air connection
Fig. 9
Filter elements for air supply
To protect the pilot valve against dirt particles,
connection 9 for air supply is equipped with a
sieve, mesh size 100 µm, and a filter, pore size
30 µm.
The filter elements must be cleaned or replaced
when contaminated (see Fig. 9).
Cleaning/replacing the filter elements
1Use a screwdriver (7 to 9 mm blade) to un-
thread the sieve from the supply air con-
nection 9.
2Clean sieve or replace it. Screw into the
supply air connection 9.
3Undo two hexagon socket head screws 
and two split washers . Remove connec-
tion block/booster valve from enclosure.
4Pull filter out of connection bore.
5Clean filter or replace it. Insert it into
connection bore. Make sure the seal is
correctly positioned.
6Fasten connection block/booster valve to
the enclosure using two hexagon socket
head screws and two split washers .
Make sure that the seals or and two
O-rings are positioned correctly.
Spare parts Order no.
Seal with restrictor 1890-3891
O-ring 610520-0496
Seal 1220430-1134
Filter 0550-0653
Seal with ball 1890-3892
(only if one pilot valve is used)
Hexagon socket head screw 8333-1191
ISO 4762 – M 430
Split washer – form B 4 8392-0654
Sieve 0550-0213

EB 8368 EN – 20 –
Restrictors
Fig. 10
Exhaust air filter and degree of protection
The devices are equipped either with a filter
(IP 54) or a filter check valve (IP 65) in the en-
closure cover.
Devices with
Types 3776-XXXXXX10/-XXXXXX12
-XXXXXX30/-XXXXXX31
-XXXXXX40/-XXXXXX41
-XXXXXX50/-XXXXXX51
-XXXXXX60/-XXXXXX61
-XXXXXX70/-XXXXXX71
Booster Valve
To prevent water or dirt entering the booster
valve, use a filter or other suitable countermea-
sures.
Type 3776 Booster Valve
-XXXXXX31 Connection Restrictors KVS value
-XXXXXX41 4Exhaust air 0.01 … 0.23
-XXXXXX51 2Supply air
-XXXXXX61
-XXXXXX71
Type 3776 Booster Valve
-XXXXXX12 Connection Restrictors KVS value
2Exhaust air 0.01 … 0.18
2Supply air
Restrictors
Devices with
Types 3776-XXXXXX12/-XXXXXX31
-XXXXXX41/-XXXXXX51
-XXXXXX61/-XXXXXX71
Booster Valve
These devices are equipped with supply air re-
strictors/exhaust air restrictors (see Fig. 10).
Use a screwdriver to turn the restrictor screws
and clockwise to close amd counterclock-
wise to open them to achieve different closing
and opening times (e.g. for rotary actuators at
a ratio of 1:15).
A minimum flow rate is provided when the re-
strictor screws are closed.