Samson Type 4708 Mounting And Operating Instructions

Supply Pressure Regulator
Type 4708

Mounting and
Operating Instructions

EB 8546 EN

Edition February 2005

Fig. 1 · Supply pressure regulators

Type 4708-5352 on Type 3730 Positioner

Type 4708-6252 on Type 3372 Actuator

Type 4708-1152 with filter receptacle

Contents Page

1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 4

1.1 Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Mounting the supply pressure regulator . . . . . . . . . . . . . . . . 8

2.1 Compact supply pressure regulator . . . . . . . . . . . . . . . . . . . 8

2.1.1 Direction of flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.2 Turning the supply pressure regulator . . . . . . . . . . . . . . . . . . 9

2.2 Supply pressure regulators for attachment to positioners and actuators. . 10

3 Pneumatic connections . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1 Pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2 Additional connection for a solenoid valve . . . . . . . . . . . . . . . 15

4 Set point adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 18

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2 EB 8546 EN

Contents

EB 8546 EN 3

Safety instructions

General safety instructions

4

The supply pressure regulator may only be mounted, started up or serviced
by fully trained and qualified personnel, observing the accepted industry
codes and practices. Make sure employees or third persons are not exposed
to any danger. All safety instructions and warnings in these mounting and
operating instructions, particularly those concerning assembly, start-up and
maintenance, must be observed.

4

Proper shipping and appropriate storage of the regulator are assumed.

1 Design and principle of

operation

The supply pressure regulator is used to sup

-

ply pneumatic measuring and control equip

­ment with a constant air supply.
The maximum 12 bar pressure of the com

­pressed 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 input side, the supply pressure regu

­lator is equipped with a filter cartridge with
a mesh size of 20 µm. In addition, the regu

-

lator can also be equipped with a filter re

­ceptacle and a pressure gauge on the outlet
side.

The compressed air at the input flows across
the filter and through the free cross-sectional
area between the seat (1.1) and plug (1.2).
It leaves the output with a reduced pressure
depending on the plug position.

The output pressure to be controlled is trans

-

ferred via the bore (1.3) to the operating di

-

aphragm (2) where it is converted into a po

­sitioning force. This force is used to move
the valve plug depending on the force of the
positioning spring (4).
Turning the set point screw (7) causes the
spring force to change and, as a result, the
required 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 (4).

Condensed water contained in the com­pressed air can be collected and drained
when the filter cartridge (9) is mounted hori­zontally or the filter receptacle (12) is sus­pended downwards. The stopper (10) or
drain plug (15) can be unscrewed to drain
condensed water.

4 EB 8546 EN

Design and principle of operation

EB 8546 EN 5

Design and principle of operation

Fig. 2 · Sectional drawings

1.11 1.21.3 2 3 4 5 6 7 8

9

11

11.1

12.1

12
13

9

15

10

10.1

Adapter plate/connecting plate

Diverting gasket

1 Body

1.1 Seat

1.2 Plug

1.3 Bore
2 Operating diaphragm
3 Venting bore
4 Positioning spring
5 Cap
6 Lock nut
7 Set point screw
8 Adjustment knob
9 Filter cartridge
10 Stopper
11 Bushing

11.1 Gasket
12 Filter receptacle

12.1 Gasket
13 Screw
15 Drain plug

1.1 Versions

Standard version Type 4708-

xxxx

Filter on aluminum basis without
filter receptacle

10

With plastic filter receptacle

11

With aluminum filter receptacle

12

Stainless steel supply pressure regulator

Filter on stainless steel basis with
stainless steel receptacle

13

With plastic filter receptacle

14

Without filter receptacle

17

Connection

G ¼

2

¼-18 NPT

5

Set point range 0.5 to 6 bar (8 to 90 psi)

Without pressure gauge

0

With pressure gauge,
completely free of copper

1

With pressure gauge,
copper-free housing

2

Set point range 0.2 to 1.6 bar (3 to 23 psi)

Without pressure gauge

3

With pressure gauge, comple

-

tely free of copper

4

With pressure gauge,
copper-free housing

5

Supply pressure regulator with adapter plate
for positioners

Type 3730, 3766, 3767, 3780,
3785, 3787

53

Type 3730, 3766, 3767, 3780,
3785, 3787

54

Type 4763/4765

55 0

Type 3760

57

Type 3761

58

Supply pressure regulator with adapter plate
for pneumatic actuators

Type 3277 (240 to 700 cm

2

)
with Type 3730, 3766, 3767,
3780, 3785 or 3787 Positioner

63 0

Type 3372

62

Filter without pressure gauge

Type 4708-

xxx0

Aluminum housing and plastic
filter receptacle

83 0

Aluminum housing and alu

-

minum filter receptacle

84 0

Stainless steel housing and
plastic filter receptacle

86 0

Stainless steel housing and
stainless steel filter receptacle

87 0

6 EB 8546 EN

Design and principle of operation

1.2 Technical data

EB 8546 EN 7

Design and principle of operation

Supply pressure regulator Type 4708-xx

Supply pressure

1 bar (15 psi) above the adjusted set point,

however, at least 1.6 bar (24 psi) · Max. 12 bar (180 psi)

Output pressure Adustable from 0 to 1.6 bar (0 to 24 psi) or 0 to 6 bar (0 to 90 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 ≤ 0.05 mn

3

/h (with 7 bar supply air)

Permissible ambient
temperature

–20 to 70 °C

(–30 °C possible, but in this case, air consumption reaching up to 0.3 m

n

3

/h with

7 bar supply pressure)

Input pressure dependance < 0.01 bar / ∆p = 1 bar

Reversing error 0.1 bar to 0.4 bar (depending on the set point)

Hysteresis < 0.1 bar

Pressure gauge Ø40
indication range

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

Connection G 1/8

Type 4708- 10 11 12 13 14 17 53 54 55

Weight, approx. 0.48 0.58 0.66 1.65 1.2 1.0 0.68 0.95 0.37

Type 4708- 57 58 62 63 83 84 86 87

Weight, approx. 0.47 0.4 0.4 0.87 0.24 0.32 0.59 0.95

Materials

Body Polyamide, glass fiber reinforced

Adapter plate Aluminum alloy, anodized black

Stopper and gasket Polyamide, glass fiber reinforced and NBR

Cover Polyamide, glass fiber reinforced

Cap Polyamide, glass fiber reinforced

Plug Polyamide, glass fiber reinforced and polyoxymethylene

Plug sealing NBRT and VMQ

Diaphragm NBR

Diaphragm plate Polyamide, glass fiber reinforced

Filter cartridge Polypropylene

Pressure gauge housing

connection

Stainless steel

St. steel (version free of copper)

Brass, nickel-plated

2 Mounting the supply pressure

regulator

To prevent excessive amounts of condensed
water from collecting, the distance between
the compressor and supply pressure regula

­tor should be kept as short as possible.
Make sure the drain plug faces downwards
in versions with a filter receptacle.

2.1 Compact supply pressure

regulator

The supply pressure regulator can either be
mounted directly in the pipeline of the air
supply or on rails or brackets using the cor­responding mounting parts (see table in
section 7 on page 19).

Observe the direction of flow of the supply
air. An arrow on the nameplate indicates
the direction.

2.1.1 Direction of flow

In the compact supply pressure regulators
4708-10xx/-11xx/-14xx and -17xx the
direction of flow can be changed as follows:

1. Unscrew both fixing screws and lift the
supply pressure regulator off its connect

-

ing plate.

2. Remove the diverting gasket, turn it
180 degrees and reposition it as shown
in Fig. 3.
Note! The long rubber finger of the gas

­ket must always point in the direction of
the regulator output.

3. Screw the supply pressure regulator tight
onto the connecting plate.

4. Stick the enclosed adhesive label over
the arrow of the nameplate, ensuring the
arrow indicates that the supply air flows
in the opposite direction.

8 EB 8546 EN

Mounting the supply pressure regulator

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

G

4708-112.

0

6

3-....

0

6

3-....

4708-112.

G

Connecting plate

Standard label

Gasket

Connecting plate

Label with arrow

Fixing screws

Long rubber finger always pointing towards the regulator output

Supply
pressure
reglulator

2.1.2 Turning the supply pressure
regulator

The supply pressure regulator can be turned
on its connecting plate to allow the set point
adjuster to face either up or down.

1. Unscrew both fixing screws and lift the

supply pressure regulator off its connect

-

ing plate.

2. Pull the diverting gasket out of the regu

-

lator and keep it in this position.

3. Turn the regulator 180 degrees and re

­insert the gasket. In this way, you keep
the bore assignment of the gasket for
supply air input and regulator output.
Note! The long rubber finger of the gas

­ket must always point in the direction of
the regulator output (reduced supply
pressure).

4. Screw the regulator tight onto the con

-

necting plate.

EB 8546 EN 9

Mounting the supply pressure regulator

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

Supply air input

Connecting plate or adapter plate

Supply air input
(Supply) >

Regulator facing downward

Diverting gasket

Long rubber finger

always pointing

towards output

Regulator facing upward

Fixing screws

Regulator output

Diverting gasket

Front and back view

Regulator output (long rubber finger)

Supply air input
depending on the
position of the
gasket

2.2 Supply pressure regulators
for attachment to positioners
and actuators

The supply pressure regulator versions in

-

tended for attachment to positioners and ac

­tuators are equipped with various adapter
plates for the attachment.
If required, the installation position of the
supply pressure regulator can be changed
by turning it 180° on its adapter plate to al

­low the adjustment knob to face either up or
down. This applies particularly for
positioners which can be attached either to
the left or right side of the valve yoke to de

­termine the operating direction and fail-safe
action of the actuator.
To turn the supply pressure regulator, pro­ceed as described for the compact supply
pressure regulator in section 2.1.2. The reg­ulator is turned on its adapter plate instead
of on the connecting plate.

Regulators for Types 3730/3766/3767/
3780/3785/3787 Positioners

Type 4708-53xx for Type 3271 Actuator up
to 700 cm

2

and Type 3277 Actuator with

120 cm

2

as well as 240 to 700 cm2with

hooked-up accessories

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

adapter plate (1).

2. Place the supply pressure regulator on

the positioner on the side where the
pneumatic connections SUPPLY and
OUTPUT are located. Screw tight using
both M5 screws (3).

3. Close the spare connections with

stoppers (4) to prevent dirt from entering
the device.

Type 4708-54xx for Type 3271 Actuator
with 1400 and 2800 cm

2

or single-acting

rotary actuators.
Proceed to mount as for Type 4708-53xx.

10 EB 8546 EN

Mounting the supply pressure regulator

Fig. 5 · Attachment onto positioners

Type 4708-53xx

Type 4708-54xx

73

192

109

4708-535.

6

0

0

6

NPT

1

2

3

4

1

Type 4708-55xx for Type 4763 and
Type 4765 Positioner

1. Screw the special nuts (5) into the con

-

necting bores of the positioner.

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

3. Push the special hollow screws (6) for
SUPPLY and (7) for OUTPUT into the
connecting bores of adapter plate (1).

4. Place the supply pressure regulator onto
the positioner and screw it tight using
both special screws.

5. Close the spare connections with
stoppers (4) to prevent dirt from entering
the device.

Type 4708-57xx for Type 3760 Positioner

The attachment for a positioner mounted on
the left side of the valve yoke (seen from the
black switchover plate) is shown. For a
positioner mounted on the right side, the
adapter plate is attached in the same way,
except the supply pressure regulator must be
turned by 180° (see bottom of page 23).

1. Screw the special nuts (5) into the con

-

necting bores of the positioner.

2. Insert the O-rings (9) into the recess of
the adapter plate (1).

3. Push the special hollow screws (6) for
SUPPLY and (7) for IN. SIGNAL into the
connecting bores of the adapter plate
(1).

4. Place the supply pressure regulator onto
the positioner and screw it tight using
both special screws.

5. Close the spare connections with stop

-

pers (4) to prevent dirt from entering.

EB 8546 EN 11

Mounting the supply pressure regulator

Fig. 6 · Attachment onto positioners

6

0

S

A

M

S

O

N

4

7

6

3

4708-552.

6

0

G

1

7

6

5

5

2

1

4

4

1
7

9

6

1

5

5

< Switchover

plate

Type 4708-58xx for Type 3761 Positioner

1. Screw the special nut (5) into the SUPPLY
connecting bore of the positioner.

2. Push the special hollow screw (6) into
the connection bore of the adapter plate
(1).

3. Insert the O-ring (9). Position the supply
pressure regulator and screw it tight to
the positioner with the special screw.

4. Close the spare connections with
stoppers (4) to prevent dirt from entering
the device.

Type 4708-63xx for Type 3277 Actuator

Before attaching the supply pressure regula­tor, check whether the tongue of the gasket
(1.2) is aligned at the adapter block (1) in
such a way that the actuator symbol (1.3)
indicating “Actuator stem extends” or “Actu­ator stem retracts” matches the fail-safe ac­tion of the actuator.
If this is not the case, unscrew the three fix­ing screws (3), lift off the cover plate (1.1)
and turn the gasket (1.2) by 180° and rein

-

sert it.

1. Place the adapter block on the positioner
and actuator yoke and fasten using fix

-

ing screws (2).

12 EB 8546 EN

Mounting the supply pressure regulator

Fig. 7 · Attachment of supply pressure regulators

1
38

2
38

G

O
utput

O
utput

S

Input

6

5

4

3

2

1

0

27

1

6
9

4

1

5

2

3

1

1.1

1.2

1.3

G3/8

06

06

Type 4708-62xx for Type 3372 Actuator

1. Screw the special nut (5) into the SUPPLY
connecting bore of the actuator.

2. Push the special hollow screw (6) into
the connecting bore of the adapter
plate.

3. Insert the O-ring (9). Position the supply
pressure regulator and screw it tight
onto actuator using the special screw.

4. Close the spare connections with
stoppers (4) to prevent dirt from entering
the device.

EB 8546 EN 13

Mounting the supply pressure regulator

Fig. 8 · Attachment to Type 3372 Actuator

1
9

5

6

4

1
6

5

9

4

3 Pneumatic connections

The pneumatic connections are designed ei

­ther as G 1/4 or 1/4 NPT-18 threads. In
compact supply pressure regulators, an ar

-

row on the adhesive label indicates the di

-

rection from the supply air input to the out

-

put.
In supply pressure regulators with two con

­necting bores in the adapter plate (Figs. 5
and 6, top), the supply air connection is
marked SUPPLY. The positioner's output sig

­nal is led in these versions via the OUTPUT
bore through the adapter plate to the actua

­tor.

3.1 Pressure gauge

Mount the pressure gauge in such a way
that there is a 2-3 mm gap between the lock
nut and pressure gauge's square end after
tightening the lock nut (20).

In the compact versions 4708-12xx/13xx,
make sure additionally that the stopper (23)
is only screwed in to the point where it be

­comes aligned with the housing, otherwise
the gaskets (21, 22) will be damaged. Each
gasket is assigned either to the pressure
gauge or to the stopper and must be
changed correspondingly if you change the
location of the pressure gauge and stopper
to the other side.

14 EB 8546 EN

Pneumatic connections

Fig. 9 · Pressure gauge attachment, e.g. with Type 4708-12xx/13xx Supply Pressure Regulators

20 22

2...3 mm 0 mm

21 23

3.2 Additional connection for a
solenoid valve

An intermediate plate must be mounted be

­tween the connecting or adapter plate and
the regulator to connect a solenoid valve.
The reduced supply pressure of the supply
pressure regulator is additionally led to the
threaded connection at the side via the cor

-

responding bores in the intermediate plate.

All supply pressure regulators have the
same intermediate plate, except for Type
4708-57xx, designed for attachment to
Type 3760 Positioner (Fig. 12), its interme

­diate plate has a different bore assignment
for the air ducts. All versions can be ordered
made of aluminum or stainless steel and
with either G or NPT threads. See section 7
for more details.

EB 8546 EN 15

Pneumatic connections

Fig. 10 · Mounting an intermediate plate for Types 3730/3766/3767/3780 Positioners

1

1.1

A

A

A

A

E
SUPPLY

2

2.1

3

4

4.1

E

E

E

Output for
reduced supply air

Intermediate plate (2) with
additional connection

Mounting the intermediate plate

1. Remove the fixing screws and lift the
supply pressure regulator (4) together
with the diverting gasket (3) off the
adapter plate (1).
Make sure you do not change the posi

­tion of the diverting gasket in the supply
pressure regulator.

Note! The long rubber finger of the diverting
gasket (3) must always point in the direction
of the regulator output (reduced supply air).
See Figs. 10, 11, 12.

2. Insert O-rings (2.1) in the bores of the
intermediate plate (2).

3. Place the intermediate plate onto the
adapter plate in such a way that the
three holes located next to one another

16 EB 8546 EN

Pneumatic connections

Fig. 11 · Mounting an intermediate plate on Type 3372 Actuator

1

1.1

E

A

M

A

2

2.1

3

4

4.1

A

A

E

A
E

A
E

Intermediate

plate (2)

Supply air input

Output for
reduced supply air

are positioned over both 5 mm holes on
the adapter plate and the bores (1.1) for
the fixing screws are aligned.

4. Place the supply pressure regulator (4)
with the diverting gasket (3) onto the in

­termediate plate (2). Insert the longer
fixing screws and screw tight.

EB 8546 EN 17

Pneumatic connections

Fig. 12 · Mounting an intermediate plate on Type 3760 Positioner

SUPPLY

A

M

A

2

1

2.1

1.1

E

E

3

E

4

4.1

E

A

A

A

A

4 Set point adjustment

(Fig. 2)
Depending on the version, the set point of

the supply pressure regulator can be ad

­justed either at the adjustment knob (8), or
after screwing off the cap (5), at the set
point screw (7).

4

Turning the knob or screw clockwise in

­creases the output pressure and turning it
counterclockwise reduces the output
pressure.

4

Use the lock nut (6) to secure the setting.

Note!

When using the version with the adjustment
knob (8) to adjust the set point, make sure
that the Phillips screws are screwed tight to
prevent the knob from coming loose due to
possible vibrations.

5 Maintenance

(Fig. 2)
We recommend you check the filter as often

as possible.
Drain condensed water that has collected by
removing the stopper (10) or by unscrewing
the drain plug (15) about half a turn.

When faults occur, e.g. a pressure drop, un

-

screw the stopper (10) or the filter recepta

-

cle (12) and replace the filter cartridge (or

­der no. 8504-9027).
Prior to carrying out any maintenance work,
shut off the air supply!

In the version with a filter receptacle, screw
the fixing screw (13) tight so that the filter
cartridge sits properly. Replace the gasket
(12.1) order no. 0439-0061, if necessary.
In the versions 4708-11xx/14xx, do not un­screw the bushing (11), if at all possible. If,
however, you needed to unscrew it, you can
replace the gasket (11.1) order no.
0439-0287 as well.

If there is any leakage at the stopper (10),
the entire stopper and seal ring (10.1) order
no. 1099-3871 must be replaced.

18 EB 8546 EN

Set point adjustment

6 Troubleshooting

4

Leakage between supply pressure regu

­lator and adapter plate:
Check whether the diverting gasket
(Figs. 3 and 4) is installed and both fix

­ing screws are tightened properly.

4

Excessive blow-off over the venting bore
(3 in Fig. 2):
Check whether the diverting gasket
(Figs. 3 and 4) is installed correctly.

4

The air supply decreases and the output
pressure drops:
Check the filter cartridge (9 in Fig. 2) for
dirt and make sure the set point is cor­rectly adjusted.

7 Accessories

EB 8546 EN 19

Troubleshooting

Accessories Order no.

Mounting parts for mounting on rail acc. to EN 50022

acc. to EN 50035

1400-7341
1400-7342

Mounting parts for mounting on bracket for Type 3271Actuator 1400-7343

Intermediate plate for additional connection with Types 4708-10xx/-11xx/-53xx/-55xx/-58xx/-62xx/-63xx

Aluminum with G ¼ thread
Aluminum with 1/4 NPT thread
Stainless steel with G ¼ thread
Stainless steel with 1/4 NPT thread

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

Intermediate plate for additional connection with Type 4708-57.. Supply Pressure Regulator

Aluminum with G ¼ thread
Aluminum with 1/4 NPT thread
Stainless steel with G ¼ thread
Stainless steel with 1/4 NPT thread

1400-7401
1400-7405
1400-7403
1400-7407

Adjustment knob for set point adjustment 1400-7408

Nut for panel mounting 1400-7725

8 Dimensions in mm

20 EB 8546 EN

Dimensions in mm

Type 4708-10xx/17xx Supply Pressure Regulator

Type 4708-11xx/14xx Supply Pressure Regulator

504339

78

19

50

190(214)

19

50

43

78

50

78 (102)

90

126

60

44

G

4708-112.

3-....

0

6

Supply pressure regulators with
intermediate plate for additional
connection have an overall height
increased by 24 mm.
The dimensions in parentheses
apply.

Mounting bracket

(accessories)

EB 8546 EN 21

Dimensions in mm

06

06

80

65(89)

Output

Supply

56

42

57

99

44 44

59

42

2299

15119

125

28

70

14

4708-535.

NPT

0

6

1

2

3

4

5

Type 4708-12xx/13xx Supply Pressure Regulator

Type 4708-83xx/84xx/86xx/87xx

Supply Pressure Regulator

Type 4708-53xx Supply Pressure Regulator

for Types 3730/3766/3767/3780/3785/3787 Positioners

22 EB 8546 EN

Dimensions in mm

43 180

109

132

45

121

88

G3/8

06

06

Type 4708-54xx Supply Pressure Regulator

for Types 3730/3766/3767/3780/3785/3787 Positioners

Type 4708-55xx

for Types 4763/4765 Positioners

Output

Supply

66 (90)55

25

120

G

6

0

S

A

M

S

O

N

4

7

6

3

4708-552.

6

0

EB 8546 EN 23

Dimensions in mm

99 122

133 (157)

Supply

Input

Signal

Input

Signal

Supply

927

927

47

120

Type 4708-57xx Supply Pressure Regulator

for Type 3760 Positioner

24 EB 8546 EN

Dimensions in mm

43 180

109

132

45

121

88

G3/8

06

06

Type 4708-63xx

for Type 3277 Actuator

Attachment on left or right

60

(84)

Supply

56

30

93

1

38

2
38

G

Output

Output

S

Input

6

5

4

3

2

1

0

SAMSON

27

Type 4708-58xx

for Type 3761 Positioner

EB 8546 EN 25

Dimensions in mm

0

6

G

4

7

0

8

-

6

2

2

X

Supply

19 94

111(135)

113

60

Supply

111

Type 4708-6221

for Type 3372-031x Actuator

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

EB 8546 EN

S/Z 2005-03