Samson Type 4708 Service manual

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

2EB 8546 EN

Contents

EB 8546 EN 3

Safety instructions

General safety instructions

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.

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 com-

pressed air can be collected and drained

when the filter cartridge (9) is mounted hori-

zontally or the filter receptacle (12) is sus-

pended downwards. The stopper (10) or

drain plug (15) can be unscrewed to drain

condensed water.

4EB 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

11.1

12.1

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 cm2)

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

6EB 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 mn3/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 mn3/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 cor-

responding 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.

8EB 8546 EN

Mounting the supply pressure regulator

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

4708-112.

3-....

4708-112.

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, pro-

ceed as described for the compact supply

pressure regulator in section 2.1.2. The reg-

ulator 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 cm2and Type 3277 Actuator with

120 cm2as 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 cm2or 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

192

109

4708-535.

NPT

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