EB 8546 EN
Translation of original instructions

Type 4708-53

Type 4708-64

Type 4708-12

Type 4708 Supply Pressure Regulators

Edition March 2023

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown inthese instructions are for illustration purposes only. The actual product may vary.
Î For the safe and proper use of these instructions, read them carefully and keep them forlater reference.
Î If you have any questions about these instructions, contact SAMSON‘s After-sales Service(aftersalesservice@samsongroup.com).

Documents relating to the device, such as the mounting and operating
instructions, are available on our website at www.samsongroup.com >Service & Support > Downloads > Documentation.

Definition 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

EB 8546 EN

Contents

1
1.1
1.2

Safety instructions and measures....................................................................5
Notes on possible personal injury....................................................................7
Notes on possible property damage.................................................................72

Markings on the device..................................................................................8

3
3.1
3.2
3.3
3.4
3.5

Design and principle of operation.................................................................12
Versions.......................................................................................................14
Technical data..............................................................................................15
Spare parts..................................................................................................17
Accessories..................................................................................................18
Dimensions in mm.........................................................................................19

4
4.1
4.2

Measures for preparation.............................................................................28
Unpacking...................................................................................................28
Storage........................................................................................................28

5
5.1
5.1.1
5.1.2
5.2

Mounting the regulator.................................................................................29
Compact supply pressure regulator.................................................................29
Direction of flow...........................................................................................29
Turning the supply pressure regulator..............................................................30
Supply pressure regulators for attachment to positioners and actuators..............31

6
6.1
6.2

Pneumatic connections..................................................................................34
Pressure gauge.............................................................................................34
Additional output..........................................................................................35

7
7.1
7.2
7.3
7.4
7.4.1

Manual/automatic switchover......................................................................37
Mounting on positioners................................................................................37
Mounting using an adapter plate...................................................................38
Operating the manual/automatic switchover unit............................................39
Filter with filter receptacle..............................................................................39
Mounting the air filter....................................................................................39

8
8.1

Rotating supplementary filter........................................................................40
Mounting the rotating supplementary filter......................................................40

9

Adjusting the set point..................................................................................40

10
10.1
10.2

Maintenance................................................................................................41
Maintenance................................................................................................41
Preparation for return shipment......................................................................41

EB 8546 EN

Contents

11

Troubleshooting...........................................................................................42

12
12.1
12.2
12.3

Decommissioning and removal.....................................................................43
Decommissioning..........................................................................................43
Removing the supply pressure regulator..........................................................43
Disposal.......................................................................................................43

13

After-sales service........................................................................................44

EB 8546 EN

Safety instructions and measures

1 Safety instructions and measures
Intended use
The Type 4708 Supply Pressure Regulator reduces and controls the maximum pressure of
12 bar (180 psi) in a compressed air network to the pressure adjusted at the set point
adjuster. The device is designed to operate under exactly defined conditions (e.g. operatingpressure, temperature). Therefore, operators must ensure that the supply pressure regulator isonly used in applications where the operating conditions correspond to the technical data. In
case operators intend to use the supply pressure regulators in other applications orconditions than specified, contact SAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use thedevice for its intended purpose or for damage caused by external forces or any otherexternal factors.
Î Refer to the technical data for limits and fields of application as well as possible uses.
Reasonably foreseeable misuse
The Type 4708 Supply Pressure Regulator is not suitable for the following applications:− Use outside the limits defined during sizing and by the technical data
Furthermore, the following activities do not comply with the intended use:
− Use of non-original spare parts− Performing maintenance activities not specified by SAMSON
Qualifications of operating personnel
The supply pressure regulator must be mounted, started up and serviced by fully trained andqualified personnel only; the accepted industry codes and practices are to be observed.
According to these mounting and operating instructions, trained personnel refers toindividuals 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 theirknowledge of the applicable standards.
Personal protective equipment
No personal protective equipment is required for the direct handling of the supply pressure
regulator. Work on the control valve may be necessary when mounting or removing thedevice.

EB 8546 EN

5

Safety instructions and measures

Î Observe the requirements for personal protective equipment specified in the valve
documentation.
Î Check with the plant operator for details on further protective equipment.
Revisions and other modifications
Revisions, conversions or other modifications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example.
Furthermore, the product may no longer meet the requirements for its intended use.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the pneumatic instrumentation by the signal pressure
or by moving parts by taking appropriate precautions. They must observe all hazard statements, warning and caution notes in these mounting and operating instructions, especiallyfor installation, start-up and service work.
Responsibilities of the operator
The operator is responsible for proper operation and compliance with the safety regulations.
Operators are obliged to provide these mounting and operating instructions to the operating
personnel and to instruct them in proper operation. Furthermore, the operator must ensurethat operating personnel or third persons are not exposed to any danger.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions aswell as the specified hazard statements, warning and caution notes. Furthermore, the operating personnel must be familiar with the applicable health, safety and accident prevention
regulations and comply with them.
Referenced standards and regulations
Devices with a CE marking fulfill the requirements of the Directives 2011/65/EU (RoHS) and2015/863/EU. The declaration of conformity is included at the end of these instructions.
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:− The mounting and operating instructions of the components on which the supply pressure
regulator is mounted (valve, actuator, positioner etc.).

6

EB 8546 EN

Safety instructions and measures

1.1 Notes on possible personal injury! WARNING
Risk of bursting in pressure equipment.
Control valves, mounting parts and pipelines are pressure equipment. Improper opening
can lead to bursting of the valve.
Î Before starting any work on the control valve, depressurize all plant sections affected
as well as the valve.
Î Observe the valve's safety instructions.

1.2 Notes on possible property damage! NOTICE
Risk of damage to the supply pressure regulator due to excessively high tightening
torque.
Î Do not exceed the maximum permissible torques specified in these mounting andoperating instructions.
Risk of damage to the supply pressure regulator due to foreign particles entering it.
Î Do not remove the protective film until immediately before mounting.
Risk of damage to the supply pressure regulator due to improper storage.
Î Observe the storage instructions. Contact SAMSON, if need be.

EB 8546 EN

7

Markings on the device

2 Markings on the device
Article code
Supply Pressure Regulator

Type 4708- x

x

x

x

x

x

x

x

x

x

x

x

x

Standard version
Aluminum mounted parts, plastic body, with filter, without separate
filter receptacle

1

0

0

Aluminum mounted parts, plastic body, with transparent filter
receptacle

1

1

0

Completely of aluminum, no plastic parts

1

2

2

Completely of stainless steel, no plastic parts

1

3

3

Stainless steel mounted parts, plastic body, with transparent filter
receptacle

1

4

1

Stainless steel mounted parts, plastic body, with filter, without
separate filter receptacle

1

7

1

4

5

2/3

Aluminum mounted parts, plastic body, with filter, without separate
filter receptacle, for mounting onto Type 3730/3766/3767
Positioners

5

3

0

Aluminum mounted parts, plastic body, with filter, without separate
filter receptacle, for mounting onto Type 3730/3766/3767
Positioners

5

4

0

Aluminum mounted parts, plastic body, with filter, without separate
filter receptacle, for mounting onto Type 4763/4765 Positioners

5

5

0

Aluminum mounted parts, plastic body, with filter, without separate
filter receptacle, for mounting onto Type 3372 and Type 3277
Actuators (240 to 700 cm²) with Type 3730/3766/3767
Positioners

6

2

0

Aluminum mounted parts, plastic body, with filter, without separate
filter receptacle, for mounting onto Type 3277 Actuators (175 to
750 cm²) with connection block

6

4

0

Stainless steel version

Version for increased air capacity
Aluminum or stainless steel body, plastic cover, transparent plastic
or metal filter receptacle
Version with adapter plate for positioners

Version with adapter plate for pneumatic actuators

8

EB 8546 EN

Markings on the device

Supply Pressure Regulator

Type 4708- x

x

x

x

x

x

x

Manual/automatic switchover

8

2

0/1

Filter for compressed air, aluminum body, transparent plastic filter
receptacle

8

3

0

Filter for compressed air, aluminum body and filter receptacle

8

4

0

Filter for compressed air, stainless steel body, transparent plastic
filter receptacle

8

6

1

Filter for compressed air, stainless steel body and filter receptacle

8

7

1

x

x

x

x

x

x

Further versions

Connecting thread
ISO-228/1-G ¼

2¼-18 NPT5

ISO-228/1-G ½

6½-14 NPT7

Set point range
0.5 to 6.0 bar, without pressure gauge

00

0.5 to 6.0 bar, with pressure gauge completely of stainless steel(device free of copper)

1

0

0.5 to 6.0 bar, with pressure gauge (nickel-plated brass connection)

20

0.2 to 1.6 bar, without pressure gauge

30

0.2 to 1.6 bar, with pressure gauge completely of stainless steel(device free of copper)

4

0

0.2 to 1.6 bar, with pressure gauge (nickel-plated brass connection)

50

0.5 to 6.0 bar, with pressure gauge (nickel-plated brass connection,
dial in MPa and kg/cm³)

60

Without80

Number of pressure gauges
Without

0

One pressure gauge

1

Two pressure gauges

2

Material
Aluminum mounted parts (plastic cover)0

Stainless steel mounted parts (plastic cover)1

Aluminum mounted parts and cover2

Stainless steel mounted parts and cover3

EB 8546 EN

9Markings on the device

Supply Pressure Regulator

Type 4708- x

x

x

x

x

x

x

x

x

x

x

x

x

Without000Filter cartridge 5 µm

0

0

1

0

0

2

0

0

2

FilterWithout

0in black plastic regulator body1in transparent plastic receptacle (cannot be aligned)2

in aluminum receptacle (cannot be aligned)3

in stainless steel receptacle (cannot be aligned)

4

Temperature range–25 to +70 °C (standard)

0–40 to +70 °C

1–50 to +70 °C

2Application
Standard0

Device compatible with paint1

Exhaust port with thread

2

Special version

Pressure gauge connection

1/8

NPT

Special paint coating RAL 1019

10

EB 8546 EN

EB 8546 EN

11

Design and principle of operation

3 Design and principle of operation
The supply pressure regulator is used tosupply pneumatic measuring and control
equipment with a constant air supply. The
maximum 12 bar pressure of the compressed
air network in a plant is reduced to an
adjustable minimum pressure of 0.2 to
1.6 bar or 0.5 to 6 bar.
At the inlet side, the supply pressure
regulator is equipped with a filter cartridgewith a mesh size of 20 μm. In addition, theregulator can also be equipped with a filter
receptacle and a pressure gauge on theoutlet side.

The compressed air at the inlet flows acrossthe filter through the free cross-section between the seat (1.1) and plug (1.2) andleaves the output with a reduced pressure
depending on the plug position.
The output pressure to be controlled istransmitted to the diaphragm (2.1) over theconnecting bore (1.3) and converted into a
positioning force. This force is used to movethe valve plug depending on the force of thepositioning spring (6).
Turning the set point screw (7) causes thespring force to change and, as a result, therequired set point is adjusted.
The set point ranges of the supply pressure
regulator from 0.2 to 1.6 bar and 0.5 to
6 bar are determined by various tensions of
the installed positioning spring (6).
Condensed water contained in thecompressed air can be collected and drained
when the filter cartridge (11) is mounted
horizontally or the filter receptacle (13) issuspended downwards. The screw plug (12)can be unscrewed or the manual drainage(16) can be activated to drain condensed
water.

5

3

1
20
21

12

Fig. 1: Type 4708

12

EB 8546 EN

Design and principle of operation

7
8
5
3.1

4
6
3
2
2.1

11 12.1

12

1.2
1.1
1.3
1

11.4
12.1
11.3
11

1
Body
1.1 Seat
1.2 Plug
1.3 Connecting bore
2Plate
2.1 Diaphragm3
Cover
3.1 Venting bore
4
Centering bushing
5
Cap
6
Set point spring7
Set point screw
8
Lock nut
11 Filter cartridge
11.1 Screw
11.2 Cap
11.3 Shroud
11.4 Air deflector
12 Screw plug12.1 Seal
13 Filter receptacle
13.1 Seal
16 Manual drainage
20 Fastening screw
21 Spring washer

11.1
11.2
13

16

Fig. 2: Sectional drawings

EB 8546 EN

13

Design and principle of operation

3.1 Versions
Supply Pressure Regulator

Type 4708-

x

x

x

x

Standard version
Aluminum filter without filter receptacle

10with plastic filter receptacle

11with aluminum filter receptacle

1

2

Stainless steel version
Stainless steel filter with stainless steel filter receptacle

13with plastic filter receptacle

14

without filter receptacle

1

7Connection
G¼2¼-18 NPT5

Set point range 0.5 to 6 bar (8 to 90 psi)
Without pressure gauge0with pressure gauge, completely free of copper1with pressure gauge, housing free of copper2

Set point range 0.2 to 1.6 bar (3 to 23 psi)
Without pressure gauge3

with pressure gauge, completely free of copper4with pressure gauge, housing free of copper5

Supply pressure regulator with increased air capacity
u EB 8546-1

4

5

5

3

with adapter plate for positioners
Types 3730, 3766, 3767
Types 3725, 3730, 3766, 3767

54Type 3725, Types 4763/4765

5

5

0

6

2

0

with adapter plate for pneumatic actuators
Type 3277 Actuator (240 to 700 cm²) with Type 3730, 3766 or 3767 Positioner
Type 3372

6

2Type 3277 Actuator with connection block

6

4

14

0

EB 8546 EN

Design and principle of operation

Supply Pressure Regulator

Type 4708-

x

x

8

2

x

x

Manual/automatic switchover
Bypass for positioner
Filter without pressure gauge

Type 4708-

Aluminum body and plastic filter receptacle

8

3

0

Aluminum body and aluminum filter receptacle

8

4

0

Stainless steel body and plastic filter receptacle

8

6

0

Stainless steel body and stainless steel filter receptacle

8

7

0

Note
For details on the Type 4708-45 Supply Pressure Regulator (with increased air capacity), seeu EB 8546-1.

3.2 Technical data
Table 1: Technical data 1)
Supply Pressure Regulator

Type 4708-xx

Supply pressure

1.6 to 12 bar (24 to 180 psi)

Set point range

0.2 to 1.6 bar (3 to 24 psi) or 0.5 to 6 bar (8 to 90 psi)

Air consumption at 7 bar
supply pressure
Dependency on inlet pressure
Reversing error
Hysteresis
Filter cartridge mesh size

≤0.05 mn³/h< 0.01 bar/Δp = 1 bar
0.1 to 0.4 bar (depending on set point)< 0.1 bar
20 µm · Optionally 5 µm

Compliance
Pressure gauge
Indicating range

0 to 1.6 bar (0 to 24 psi) or 0 to 6 bar (0 to 90 psi)

Connection

G 1/8

Degree of protection

IP 65

1)

Values measured for Type 4708-xx with ¼” connection and for Type 4708-45 with ½” connection

EB 8546 EN

15

Design and principle of operation

Table 2: Materials
Supply Pressure Regulator
Body

Type 4708-xx

Metal parts

Aluminum (3.3547, anodized) or stainless steel (1.4404)

Plastic parts

Polyamide, glass fiber reinforced

Cover

Polyamide, glass fiber reinforced

Cap

Polyamide, glass fiber reinforced

Plug

Polyamide, glass fiber reinforced and polyoxymethylene

Diaphragm

NBR · FVMQ for low-temperature version

Diaphragm plate

Polyamide, glass fiber reinforced or aluminum

Set point spring

1.4310Filter receptacle 1)

UV-resistant polyamide (Grilamid TR90UV),
aluminum (3.3547) or stainless steel (1.4404)

Filter cartridge

20 µm: polypropylene · 5 µm: stainless steel

Pressure gauge
Housing

Stainless steel

Connection and measuring
element
1)

Nickel-plated brass or stainless steel for copper-free version

See Data Sheet u T 8546/article code for material version

Table 3: Ambient temperature ranges
Type 4708-

10

11

12

13

14

•

•

17

53

54

55

62

64

82

•

•

•

•

•

•

•

83

84

86

87

Version for standard temperatures–25 to +70 °C 1)–25 to +80 °C

•

•

•

•

•
•

•

Version for low temperatures–40 to +80 °C–50 to +70 °C•–50 to +80 °C
1)

•

1)

•

•

•

•

•
•

•

•

•

•

•

•
•

•

Applies also to rotating supplementary filter

Type 4708-

10

11

12

13

14

17

53

54

55

62

64

82

83

84

86

87

kg
(approx.)

0.48

0.58

0.66

1.65

1.2

1.0

0.68

0.95

0.37

0.4

0.5

0.4

0.24

0.32

0.59

0.95

Table 4: Weights

16

EB 8546 EN

Design and principle of operation

3.3 Spare parts
Î See Fig. 2 on page 13.
ArticlesOrder numbers

FilterFilter cartridge (11) 20 µm, polyethylene
Filter cartridge (11) 5 µm including seal, polyethylene
Filter cartridge (11) 5 µm, sintered stainless steel

8504-9027
8504-9030
1400-9609

Filter parts
Screw (11.1)
Cap (11.2)
Shroud (11.3)
Air deflector (11.4)

8336-0790
0339-0018
0339-0017
0339-0016

Filter receptacle and screw plug
1199-0423
1199-0424
1199-0425
0079-0143

Filter receptacle (13), plastic 1)
Filter receptacle (13), aluminum 1)
Filter receptacle (13), stainless steel 1)
Screw plug (12)Seals for filter receptacle (12.1)
For Type 4708 -10 -11 -12 -13 -14 -17 -53 -54 -55 -62 -64
PVMQ

•

•

•

•

•

•

•

•

•

8421-9123

NBR (free of silicone)

•

•

•

•

•

•

•

•

•

8421-0099

PVMQ

•

•

0439-0309

NBR (free of silicone)••0439-0061

Pressure gauges
Pressure gauge, entirely made of stainless steel (0 to 1.6 bar), including pressurecompensation element
Pressure gauge, made of brass/stainless steel (0 to 1.6 bar), including pressurecompensation element
Pressure gauge, entirely made of stainless steel (0 to 6 bar), including pressurecompensation element
Pressure gauge, made of brass/stainless steel (0 to 6 bar), including pressurecompensation element
Lock nut

100071420

Pressure gauge seal

1099-4305

1)100071428
100071411
100071415
0089-0026

Version compatible with paint on request

EB 8546 EN

17

Design and principle of operation

3.4 Accessories
Accessories

Order no.

Mounting parts for rail mounting according to EN 50022
according to EN 50035

1400-7341
1400-7342

Mounting parts for mounting on bracket for Type 3271 or Type 3277
Actuator

1402-0157

Intermediate plate for additional connection with Type 4708-10xx/-11xx/-53xx/-55xx/-62xx Supply
Pressure Regulator (not required for Type 4708-54xx)
Aluminum with G ¼ thread
Aluminum with ¼ NPT thread
Stainless steel with G ¼ thread
Stainless steel with ¼ NPT thread

1400-7400
1400-7404
1400-7402
1400-7406

Special screw to mount Type 4708-54xx on Type 3710 Reversing Amplifier

1400-7806

Adjustment knob for set point adjustment

1400-7408

Nut for panel mounting

1400-7725

Adapter plate for manual/automatic switchover (Type 4708-82)
Aluminum with G ¼ thread
Aluminum with ¼ NPT thread
Stainless steel with G ¼ thread
Stainless steel with ¼ NPT thread

1400-9605
1400-9606
1400-9607
1400-9608

Adapter plate (from Type 3710) to mount Type 4708-53 on all old versions of
Types 3766, 3767 or 3780 Positioner

1400-9621

Filter cartridge 5 µm, sintered stainless steel (replacement part)

1400-9609

Rotating supplementary filter for Type 4708-53 and Types 4708-55 to -64:
Temperature range: –25 to +70 °C
Temperature range: –50 to +70 °C

1402-1132
1402-1133

Grease for silicone-free version
Grease for natural gas version
Grease for low-temperature version

1402-1149
1402-1150
1402-1151

Pressure gauge bracket for Type 4708-55 Supply Pressure Regulator

1402-1515

Pressure gauge mounting kit up to max. 6 bar (output/supply)
Stainless steel/brass
Stainless steel/stainless steel

1402-0938
1402-0939

1)

1)

18

Year of manufacture 2017 onwards

EB 8546 EN

Design and principle of operation

3.5 Dimensions in mm(specifications in parentheses apply to additional compressed air connection, seepage 26)

Types 4708-11xx/14xx

Types 4708-10xx/-17xx
80

80
43

53

53

166

88 (112)

19

19

51

43

44

60

Output or Supply

Output or Supply

4460

Output or Supply

Supply or Output

EB 8546 EN

19

Design and principle of operation

Type 4708-54xx mounted onto Type 3725 Positioner
Output

67

110

195

Supply106

873Type 4708-53xx mounted onto Types 376x and 373x Positioners
75 (99)Output

20

51

7.7

70
28

80

SupplyEB 8546 EN

Design and principle of operation

Type 4708-54xx mounted onto Types 376x and 373x Positioners

Output

112

195

29

3
73

67

Supply106

Type 4708-55xx mounted onto Type 4763 or 4765 Positioner

123

26

Output52

EB 8546 EN

75 (99)Supply21

Design and principle of operation

Type 4708-64xx for Type 3277 Pneumatic Actuatorand Type 376x or 373x Positioner

126

38

104

116

178

40

97

74

123

Type 4708-64xx for Type 3277 Pneumatic Actuatorand Type 3725 Positioner

104
126

38

116

116

154

40
74

22

100
127

EB 8546 EN

Design and principle of operation

138

51

Type 4708-55xx mounted onto Type 3725 Positioner

100

95

42

59

Types 4708-12xx/-13xx Supply Pressure Regulators

99

Output

44

142

102

EB 8546 EN

133

Ø41
12

Supply23

Design and principle of operation

Types 4708-83xx/-84xx/-86xx/-87xx Air Filter

59
44

115

15

42

Rotating filter receptacle

78
45

146

50

18

55

Ø38.3

24

EB 8546 EN

Design and principle of operation

Type 4708-62xx Supply Pressure Regulator for Type 3372 Pneumatic Actuator
115

12

104

121 (145)

113

60

EB 8546 EN

25

Design and principle of operation

Intermediate plate for additional compressed air
shown here: Type 4708-55xx

99

24

26

EB 8546 EN

Design and principle of operation

Type 4708-82 Manual/automatic Switchover with adapter plate

SupplyOutput

70
56
28

10

82

50

13

46

56

EB 8546 EN

24

27

Measures for preparation

4 Measures for preparation
After receiving the shipment, proceed as follows:
1. Check the scope of delivery. Compare
the shipment received with the deliverynote.
2. Check the shipment for transportation
damage. Report any transportation damage.

4.1 Unpacking
Note
Do not remove the packaging if the supply
pressure regulator is to be transported toanother location or kept in storage.
Before mounting the supply pressure regulator, proceed as follows:
1. Remove the packaging from the supply
pressure regulator.

4.2 Storage! NOTICE
Risk of damage to the supply pressure
regulator due to improper storage.
Observe the storage instructions. Contact
SAMSON, if need be.
Storage instructions− Protect the supply pressure regulator
against external influences (e.g. impact,
shocks, vibration).
− Do not damage the corrosion protection(coating).
− Protect the supply pressure regulator
against moisture and dirt. In damp
spaces, prevent condensation. If
necessary, use a drying agent or
heating.
− Pack the supply pressure regulator in airtight packaging.

2. Dispose of the packaging in accordancewith the valid regulations.
! NOTICE
Risk of damage to the supply pressure
regulator due to foreign particles entering it.
Do not remove the protective film until
immediately before mounting.

28

EB 8546 EN

Mounting the regulator

5 Mounting the regulator

5.1.1

Î To prevent excessive amounts of condensed water from collecting, keep the
distance between the compressor andsupply pressure regulator as short as
possible.

In the compact supply pressure regulators(Types 4708-10xx/-11xx/-14xx and-17xx), the direction of flow can be changed
as follows:
1. Unscrew the two fastening screws and lift
the regulator off its connecting plate.

Î Make sure the drain plug faces downwards in versions with a filter receptacle.

5.1 Compact supply pressure
regulator
The supply pressure regulator can either bemounted directly in the pipeline of the air
supply or on rails or brackets using the corresponding mounting parts (see accessories
in section 3.4).
Observe the direction of flow of the supply
air. An arrow on the nameplate indicates the
direction.
GasketConnecting plate
Standard label

4708-112.
3-....

0

6

G

Supplypressure
regulator

Direction of flow

2. Remove the diverting gasket, turn it 180
degrees and reposition it (Fig. 3).
Î The long rubber finger of the gasket must
always point in the direction of the regulator outlet.
3. Fasten the supply pressure regulator onto
the connecting plate.
4. Stick the adhesive label included in theaccessories over the arrow of thenameplate, making sure that the arrow
indicates that the supply air flows in the
opposite direction.

Connecting plate
Adhesive label with arrow

4708-112.
3-....

0

Fastening screws

G

6Long rubber finger always pointing towards the regulator outlet

Fig. 3: Changing the direction of flow in compact supply pressure regulators

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29

Measures for preparation

5.1.2

Turning the supply pressure regulator

The supply pressure regulator can be turnedon its connecting plate to allow the set pointscrew to face either up or down.
1. Unscrew the two fastening screws and lift
the supply pressure regulator off its connecting plate.

3. Turn the regulator 180 degrees and reinsert the gasket. In this way, you keep thebore assignment of the gasket for supply
air input and regulator outlet.
Î The long rubber finger of the gasket must
always point in the direction of the regulator outlet (reduced supply pressure).
4. Fasten the supply pressure regulator onto
the connecting plate.

2. Pull the diverting gasket out of the regulator and keep it in this position.

Regulator facing upward
Connecting plate or adapter plate

Regulator facing downward

Supply air input(Supply) >Fastening screws
Diverting gasket
Long rubber finger
always pointing
towards outlet

Regulator outlet

Diverting gasket
Front and back view
Supply air input

Supply air input
depending on theposition of thegasketRegulator outlet (long rubber finger)

Fig. 4: Turning the supply pressure regulator on its connecting plate or adapter plate30

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Measures for preparation

5.2 Supply pressure regulators
for attachment topositioners and actuators
The supply pressure regulator versions
intended for attachment to positioners andactuators are equipped with various adapter
plates for the attachment.

Type 4708-54xx has a second output sealedwith a stopper. This is intended for reduced
supply air. It can be used to supply a second
device, if required (e.g. a pilot-operated
solenoid valve).
Type 4708-53xx

If required, the installation position of the
supply pressure regulator can be changedby turning it 180° on its adapter plate to allow the set point screw to face either up or
down.
This applies particularly to positioners thatcan be mounted either to the left or right sideof the valve yoke to determine the operating
direction and fail-safe action of the actuator.
To turn the supply pressure regulator, proceed as described in section 5.1.2.
The regulator is turned on its adapter plate
instead of on the connecting plate.
Supply pressure regulator for
Type 3730/3766/3767/3787 Positioner

Type 4708-54xx

Type 4708-53xx for Type 3271 Actuatorand Type 3277 Actuator (120, 240 to
700 cm²) with hooked-up valve accessories
1. Insert the gasket (2) into the recess of theadapter plate (1).
2. Place the supply pressure regulator on
the positioner on the side where thepneumatic connections SUPPLY andOUTPUT are located. Screw tight using
the two M5 screws (3).
Type 4708-54xx for rotary actuators
Proceed to mount as for Type 4708-53xx.

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Fig. 5: Attachment on positioners

31Measures for preparation

0Type 4708-55xx for Types 3725, 4763 and4765 Positioners
1. Screw the special nuts (5) into the connecting holes of the positioner.

SAMSON 4763

604708-552.

6G

2. Insert the gasket (2) into the recess of theadapter plate (1).

1

1
7
5

3. Slide the special hollow screws (6) for
SUPPLY and (7) for OUTPUT into theconnecting holes of adapter plate (1).

2
5

4. Place the supply pressure regulator onto
the positioner and fasten it using the two
special screws.
5. Seal the spare connections with stoppers(4) to prevent dirt from entering thedevice.

4

6Fig. 6: Attachment to Types 4763 and 4765
Positioners

Type 4708-64xx for Type 3277 Actuator
Before mounting, check whether the tip of
the gasket (1.2) projecting from the side of
the connection block (1) is positioned tomatch the actuator symbol (1.3) for the actuator's fail-safe action "actuator stem extends" or "actuator stem retracts". If this is
not the case, proceed as follows:
1. Unscrew the three Phillips screws (3.1),
lift off the cover (1.1). Turn the gasket(1.2) by 180° and re-insert it. Continue
with reassembly.
2. Place the connection block (1) with theinserted O-ring against the positioner
and actuator yoke and fasten using thehexagonal socket screw (3).
3. Place the supply pressure regulator with
O-ring on the connection block and fasten it with hexagonal socket screw (2).

3.1
1

10

4

1.1
1.3
1
1.3

2

1

3

1.2

1
7
5
9
5
6

1.2
3.1

Fig. 7: Mounting on Type 3277 Actuator

32

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Measures for preparation

Type 4708-62xx for Type 3372 Actuator
1. Screw the special nut (5) into the SUPPLY
connecting hole of the actuator.
2. Slide the special hollow screw (6) into theconnection hole of the adapter plate.

3. Insert the O-ring (9). Position the supply
pressure regulator and fasten it to theactuator using the special screw.
4. Seal the spare connections with stoppers(4) to prevent dirt from entering thedevice.

1
6
5
9

4

1
9
5

4

6

Fig. 8: Mounting on Type 3372 Actuator

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Pneumatic connections

6 Pneumatic connections

6.1 Pressure gauge

The air connections are designed either withG ¼ or ¼-18 NPT threads. On compact
supply pressure regulators, an arrow on theadhesive label indicates the direction fromthe supply air input to the output.

When attaching the pressure gauge, makesure that a gap of 2 to 3 mm remains between the lock nut (20) and pressure gauge’s
square on tightening the lock nut.
For Types 4708-12xx/13xx (compact
versions), additionally make sure that theblanking plug (23) is only screwed in until it
is flush with the body. Otherwise, the seals(21, 22) will be damaged. Each seal isassigned either to the pressure gauge or to
the screw plug and must be changed
correspondingly if you change the locationof the pressure gauge and screw plug to theother side.

In supply pressure regulators with two connecting holes in the adapter plate (Fig. 5
and Fig. 6), the supply air connection ismarked SUPPLY.
The positioner's output signal is routed inthese versions over the OUTPUT port throughthe adapter plate to the actuator.

20

21

22

23

3
2

4

1

5

0

2...3 mm

6

0 mm

Fig. 9: Mounting the pressure gauge, e.g. Types 4708-12xx/-13xx (compact version)

34

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Pneumatic connections

6.2 Additional output
An additional output for reduced air pressure is required to allow the supply pressure
regulator to supply two pneumatic devices.
In some versions of Type 4708 (see section
3.4 on accessories), a second output can bemade available by using an intermediate
plate.
Example: Pneumatic actuator with positioner
and pilot-operated solenoid valve

Î The supply air must be supplied separately to the pilot control.
The reduced supply pressure of the supply
pressure regulator is additionally routed tothe threaded connection at the side over thecorresponding holes in the intermediate
plate.
All versions can be ordered made of aluminum or stainless steel and with either G or
NPT threads. See section 3.4.

1

Output for reduced
supply air

1.1

E
SUPPLY

A
2
2.1
A

E

3
A

Intermediate plate (2) withadditional connection

E

4

Fig. 10: Mounting an intermediate plate for Types 3730, 3766 and 3767 Positioners

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35

Pneumatic connections

Mounting the intermediate plate
1. Remove the fastening screws and lift the
supply pressure regulator (4) together
with the diverting gasket (3) off theadapter plate (1). Make sure you do notchange the position of the diverting gasket in the supply pressure regulator.
Î The long rubber finger of the diverting
gasket (3) must always point toward theregulator outlet (reduced supply pressure). See Fig. 10 and Fig. 11.

3. Place the intermediate plate onto theconnecting or adapter plate in such a
way that their three boreholes (arranged
in row) are located over the two 5 mmboreholes of the adapter plate and theboreholes (1.1) for the fastening screws
are aligned correctly.
4. Place the supply pressure regulator (4)with the diverting gasket (3) onto the intermediate plate (2). Insert the longer
fastening screws and fasten the parts.

2. Insert the O-rings (2.1) into the boreholes of the intermediate plate (2).

Supply air input

E
A

1.1
1
2
2.1

Output for reduced air

A
E
A
A
E

3
2

4

Fig. 11: Mounting an intermediate plate onto Type 3372 Actuator

36

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Manual/automatic switchover

7 Manual/automatic
switchover

7.1 Mounting on positioners

The positioner output is routed to the actuator over the manual/automatic switchover. In
automatic mode, the positioner is in closedloop operation. In manual mode, the output
pressure of any supply pressure regulator is
directly applied to the actuator. This createsa manual bypass of the positioner.
The manual/automatic switchover unit ismounted directly onto Types 376x and 373x
(see Fig. 12) or on an adapter plate with
hook-up to the actuator (Fig. 15).
The Type 4708-53 or Type 4708-54 Supply
Pressure Regulator can be directly mounted.
All other supply pressure regulators can beconnected to the manual/automatic switchover unit using piping (hook-up).

Fig. 12: Mounting on positioners− Insert gasket into recess of the manual/automatic switchover unit.
− Fasten the manual/automatic switchover
unit to the positioner using the two
hexagonal socket screws.
− Connect hook-up to the SUPPLY andOUTPUT connections of the manual/automatic switchover unit.

1
Output (38)2

Output3

SupplySupply (9)

4

2

1

4

Pneumatic control valve
with positioner
Adapter plate:
1400-9605 (G),
1400-9606 (NPT)Type 4708-82 Manual/automatic Switchover in
AUTO mode
Supply pressure regulator
with filter (e.g.
Type 4708-10)

3

Fig. 13: Mounting the manual/automatic switchover using an adapter plate

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37

Manual/automatic switchover

Optionally, a Type 4708-53 Supply Pressure
Regulator can be mounted upstream of themanual/automatic switchover unit (Fig. 14).

7.2 Mounting using an adapter
plate− Fasten adapter plate, for example to a
NAMUR rib using a hexagonal socket
screw.
− Fit the gasket on the manual/automatic
switchover unit. Fasten it to the adapter
plate using the two hexagonal socket
screws.

Fig. 14: Type 4708-82 Manual/automatic
Switchover, Type 4708-53 Supply
Pressure Regulator with pressure gauges
and filter receptacle

38

Fig. 15: Mounting using an adapter plate− Connect hook-up for positioner and actuator as shown in Fig. 13.

EB 8546 EN

Manual/automatic switchover

7.3 Operating the manual/automatic switchover unit
In normal operation, the manual/automatic
switchover runs in automatic mode, during
which the positioner supplies air to the pneumatic actuator.

Fig. 16: Cap and switchover pin

To switch to manual mode, twist off theplastic cap. Turn the switchover pin
counterclockwise and pull it (approx. 1 cm)
out of the bayonet lock.
The compressed air is then routed directlyfrom the supply pressure regulator or fromthe air supply network to the pneumatic
actuator.

7.4 Filter with filter receptacle
The Types 4708-83, -84, -86 and -87 Air
Filters are designed for universal use. They
have either G ¼ or ¼-18 NPT threaded
connection.

Fig. 17: Types 4708-83 Air Filter

7.4.1

Mounting the air filter

Mount the air filter directly into the pipeline,
while ensuring the direction of flow (printed
on the device) is kept.
Î The filter receptacle must face downwards to function correctly.

To switch back to automatic mode, push in
the switchover pin again. To do this, insert
the lock pin completely into the bayonet andlock it.
Replace plastic cap and tighten.

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39Rotating supplementary filter

8 Rotating supplementary filter
The rotating supplementary filter (Fig. 14) isdesigned for mounting to Type 4708-53 andTypes 4708-55 to -64 Supply Pressure
Regulators 1). It replaces the small integrated
filter cartridge. The entire filter housing canbe rotated by 360° to ensure that thecondensate drain always faces downwards.
Filter versions
Aluminum body with filter in transparent
plastic receptacle
Temperature range: –25 to +70 °C,
order no. 1402-1132
Special version:
Temperature range: –50 to +70 °C,
order no. 1402-1133

Fig. 18: Connection and seal for supplementary
filter

8.1 Mounting the rotating
supplementary filter

9 Adjusting the set point

1. Remove the cover and filter cartridgefrom the supply pressure regulator.

Î Unscrew the cap (5) on the set pointscrew (7) and adjust the set point of the
supply pressure regulator.

2. Place the supplied seal carefully onto thegroove (see arrow) of the connection.
3. Insert connecting pipe together with seal
into the supply pressure regulator andtighten the plastic coupling nut.
Î Make sure that the seal does not fall outof the groove on mounting.
4. Adjust the direction of the supplementary
filter until it is upright.
5. Secure the position by tightening thehexagonal socket screw (6 mm).
1)40

Î Refer to Fig. 2

Î Turning the screw clockwise increases theoutput pressure and turning it counterclockwise reduces the output pressure.
Î Lock the setting with the lock nut (8).
! NOTICE
Risk of damage to the supply pressure regulator due to excessively high tightening
torque applied to the lock nut.
Do not exceed the maximum torque of
7 Nm.

Year of manufacture 2017 onwards

EB 8546 EN

Maintenance

10 Maintenance
Note
The supply pressure regulator was checkedby SAMSON before it left the factory.
− The product warranty becomes void ifservice or repair work not described inthese instructions is performed without
prior agreement by SAMSON's after-sales
service.
– Only use original spare parts by
SAMSON, which comply with the original
specifications.

10.1 Maintenance10.2 Preparation for return shipment
Defective supply pressure regulators can be
returned to SAMSON for repair.
Proceed as follows to return devices to
SAMSON:
1. Put the control valve out of operation.
See associated valve documentation.
2. Remove the supply pressure regulator(see section 12).
3. Proceed as described on our website atwww.samsongroup.com > Service &Support > After-sales Service > Returning
goods.

! WARNING
Risk of injury due to high pressure.
Shut off the air line before performing workon the supply pressure regulator.
Drain condensed water that has collected:
Î Activate the manual drainage.
Î Replace the seal (order no. 0439-0061),
if necessary.
Tip
We recommend to check the filter as often as
possible.

EB 8546 EN

41Troubleshooting

11 Troubleshooting! WARNING
Risk of injury due to high pressure.
Shut off the air line before performing workon the supply pressure regulator.
Leakage between supply pressure regulator
and adapter plate:Î Check whether the diverting gasket(Fig. 3 and Fig. 4) is installed and thetwo fastening screws are tightened
properly.
Excessive blow-off over the venting bore:
Î Check whether the diverting gasket(Fig. 3 and Fig. 4) is installed correctly.
Air capacity drops and the output pressure
drops:
Î Check the filter cartridge for dirt andmake sure the set point is correctly adjusted.
Pressure dropÎ Unscrew the filter receptacle and renew
the filter cartridge (order no. 85049027).

42

EB 8546 EN

Decommissioning and removal

12 Decommissioning andremoval! WARNING
Risk of bursting in pressure equipment.
Control valves, mounting parts and pipelines
are pressure equipment. Improper opening
can lead to bursting of the valve.
− Before starting any work on the control
valve, depressurize all plant sections
affected as well as the valve.
– Observe the valve's safety instructions.

12.1 Decommissioning
To decommission the supply pressure regulator for maintenance work or disassembly,
proceed as follows:

12.3 Disposal
We are registered with theGerman national register for
waste electric equipment (stiftungear) as a producer of electricaland electronic equipment,
WEEE reg. no.: DE 62194439

Î Observe local, national and international refuse regulations.
Î Do not dispose of components, lubricantsand hazardous substances together withyour other household waste.
Tip
On request, we can appoint a service provider to dismantle and recycle the product.

1. Disconnect the supply pressure of thepneumatic actuator.
2. Disconnect the supply air.
3. If necessary, allow valve components tocool down or heat up.

12.2 Removing the supply
pressure regulator
1. Put the supply pressure regulator out of
operation. See section 12.1.
2. Undo the threaded connections.
3. Remove the supply pressure regulator
from the pipeline.

EB 8546 EN

43After-sales service

13 After-sales service
Contact SAMSON's After-sales Service forsupport concerning service or repair work or
when malfunctions or defects arise.
E-mail address
You can reach our after-sales service at thefollowing e-mail address:
aftersalesservice@samsongroup.com
Addresses of SAMSON AG and its subsidiaries
The addresses of SAMSON AG, its subsidiaries, representatives and service facilities
worldwide can be found on our website(www.samsongroup.com) or in all SAMSON
product catalogs.
Required specifications
Please submit the following details:− Order number and position number inthe order− Type, serial number, device version

44

EB 8546 EN

SAMSON REGULATION S.A.S.
1/1
DECLARATION UE DE CONFORMITEEU DECLARATION OF CONFORMITY

DC008
2019-11EU KONFORMITÄTSERKLÄRUNG

La présente déclaration de conformité est établie sous la seule responsabilité du fabricant.
This declaration of conformity is issued under the sole responsibility of the manufacturer.
Die alleinige Verantwortung für die Ausstellung dieser Konformitätserklärung trägt der Hersteller.
Nous certifions pour les produits suivants en exécution standard :For the following products in standard execution:
Für die folgenden Produkte in Standard-Ausführung:Type / type / Typ :2371, 3249, 3252, 3310, 3331, 3347, 3349, 3351, 3710, 3711, 3776, 3777, 3812,
3963, 3964, 3967, 4708, 4746, 5090, Samstation

sont conformes à la législation applicable harmonisée de l’Union :the conformity with the relevant Union harmonization legislation is declared with:wird die Konformität mit den einschlägigen Harmonisierungsrechtsvorschriften der Union bestätigt:
RoHS 2011/65/EU, 2015/863/EU
Fabricant :Manufacturer:
Hersteller:

EN50581:2012-09

SAMSON REGULATION S.A.S.
1, rue Jean Corona69520 Vaulx-en-Velin
FranceVaulx-en-Velin, le 26/11/19
Au nom du fabricant,On behalf of the Manufacturer,
Im Namen des Herstellers,
SAMSON REGULATION S.A.S.

Joséphine SIGNOLES-FONTAINE
Responsable QSESAMSON REGULATION • 1 rue Jean Corona • 69120 Vaulx-en-Velin
Tél.: +33 (0)4 72 04 75 00 • Fax: +33 (0)4 72 04 75 75 • E-mail: samson@samson.fr • Internet: www.samson.fr

BNP Paribas

N° compte 0002200215245 • Banque 3000401857
IBAN FR7630004018570002200215245 • BIC (code SWIFT) BNPAFRPPVBE

Société par actions simpifiée au capital de 10 000 000 € • Siège social : Vaulx-en-Velin
N° SIRET: RCS Lyon B 788 165 603 00127 • N° de TVA: FR 86 788 165 603 • Code APE 2814Z

Crédit Lyonnais

N° compte 0000060035B41 • Banque 3000201936
IBAN FR9830002019360000060035B41 • BIC (code SWIFT) CRLYFRPP

EB 8546 EN

45

46

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47

SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samsongroup.com · www.samsongroup.com

2023-04-05 · English

EB 8546 EN