up to 80 bar

up to 10 l/min

Proportional Pressure

Reducing Valve

PDM08

Control electronics Connection housings

Cartridge valves

E 5.168.3/12.03

1. DESCRIPTION

1.1. GENERAL

According to DIN-ISO 1219,

HYDAC proportional pressure

reducing valves, type PDM, are

control valves, used in oil

hydraulic systems, which in the

main provide a constant outlet

pressure where there is a variable

inlet pressure. The outlet

pressure to be controlled is

determined by the current signal

which is supplied by appropriate

control electronics and which

affects an actuating solenoid.

This solenoid is a pressure-tight,

wet-pin type and has the following

advantages:

– completely sealed

– low noise level and long service

life due to oil damping

– good heat dissipation via the oil

– solenoid coil can be turned

through 360°, as well as reversed

and removed without having to

open the hydraulic system.

The control electronics for the

valve are available on request in

three versions and are pre-set in

accordance with the relevant

valve details. The valve design

also allows other commercially

available control systems to be

used, however, in this case the

valve characteristics may differ

from the details given in the

brochure.

The HYDAC proportional pressure

reducing valve PDM is designed

as a compact cartridge valve and

has the following advantages:

– safety type and surface protection

make it suitable for use in the

mobile sector

– excellent control and stability

properties

– low hysteresis

– four pressure ranges mean

excellent system adjustment

– standardised installation

dimensions to ISO 7789

– space-saving installation in

housings, control blocks etc.

– simple fitting and replacement

– various connection housings

available for inline mounting

If the outlet pressure falls below

the pre-set pressure because the

user unit is relieved, the solenoid

armature pushes the control spool

down and the control process

starts again. The maximum outlet

pressure that can be achieved is

therefore determined by the

solenoid force (pressure range).

Outlet pressure relief from 1 to 3:

If the pressure across port 1 rises

above the pre-set pressure, the

control spool is pushed up by the

solenoid armature and the

connection from 1 to 3 is opened.

This controls the pressure across

port 1. If the controlling current is

interrupted, the control spool is

pushed up by the pressure across

port 1 and by the return spring.

This means that port 1 is

connected to port 3 and the

pressure across port 1 falls to

tank level.

1.3. APPLICATIONS

In oil hydraulic systems for

– control of couplings in gearboxes

– control of couplings for power

take off shafts with variable torque

progression

– specific modulation of pressure

increase and decrease

– remote adjustment of pressure

– automatic or manual adjustment

of secondary circuit pressures to

the required values

– control of pressure performance

– pilot operation of hydraulic valves

and logic elements

– control of adjustment devices on

pumps and in pump control

circuits

1.4. RECOMMENDATIONS

– port connections to be taken into

account (see point 2.1.7.)

– torque ratings to be taken into

account (see point 4.1.)

In order to guarantee correct

operation and a long service life

of the valve, the following

recommendations should be

adhered to:

– vent valve during commissioning:

flush in preferred mounting

position (solenoid pointing

downwards) and operate several

times.

– take max. permissible

contamination level of operating

fluid into account

(see point 2.2.7.)

1.2 FUNCTION

HYDAC PDM proportional

pressure reducing valves are

direct-operated spool valves in a

3-way configuration, i. e. with

outlet pressure relief. The valves

consist essentially of a valve

body, a hardened and polished

control spool, a return spring and

the solenoid coil with solenoid

armature for electrical operation.

Pressure reducing function

from 2 to 1:

In the initial position (no current

signal) the valve is closed on the

inlet side (port 2) and is

connected on the outlet side

(port 1) to the tank (port 3).

If a current signal is applied, the

solenoid armature presses onto

the control spool with a force

corresponding to the amount of

controlling current. This pushes

the control spool down against the

return spring and the oil flows

from port 2 to port 1. A user unit,

eg a cylinder, causes a build-up of

pressure across port 1 which acts

on the surface of the control spool

and produces a counter force to

the solenoid force, which moves

the control spool up again. This

reduces the flow from 2 to 1 until

the pressure across port 1 is

equal to the solenoid force and

therefore the pre-set pressure

value is as per the current signal.

If the user unit does not require

any more operating fluid

(eg at the end of the cylinder

stroke) then the control spool

moves up further and shuts off the

inlet ports.

A solenoid armature

B solenoid coil

C valve housing

D control spool

E return spring

E 5.168.3/12.03

2. TECHNICAL

SPECIFICATIONS

2.1. GENERAL

2.1.1 Designation and symbol

Proportional pressure

reducing valve

2.1.3 Type of construction

Spool valve, direct-operated

2.1.4 Type of mounting

Cartridge valve

2.1.5 Mounting position

Optional, solenoid coil pointing

downwards preferred

(see point 1.4.)

2.1.6 Weight

0.4 kg

2.1.7 Flow direction

From 2 to 1: controlled flow

From 1 to 3: outlet pressure relief

2.1.8 Ambient temperature range

Min. - 20 °C

Max. + 50 °C

2.1.9 Materials

Control spool: hardened steel

Valve body: free-cutting steel

Seals: compatible with hydraulic

oil to DIN 51524, Part 1 and 2

Standard models

Please quote stock no. when ordering.

Delivery for non-standard models is longer and the price is higher.

2.1.2 Model code

(also order example)

PDM 08130 - 01 X - 60 - G 24 - Z4

Proportional pressure reducing valve

Installation dimensions

Type

01 = technical specifications

as per this brochure

Series

(determined by manufacturer)

Pressure range

15 = up to 15 bar

25 = up to 25 bar

45 = up to 45 bar

60 = up to 60 bar

Nominal voltage

G 12 = 12 V DC

G 24 = 24 V DC

Type of solenoid

no details = connection to DIN 43650

T = Junior AMP Timer 2-pole, flat plug 2.8 x 0.8 to DIN 46244

Others on request

Type of connection, electrical

no details = no plug

Z4 = plug to DIN 43650-AF2-PG11 (on DIN 43650 connection only)

Stock no. Model code

716 312

716 320

PDM08130-01X-15-G24T

PDM08130-01X-15-G24-Z4

716 313

716 321

PDM08130-01X-25-G24T

PDM08130-01X-25-G24-Z4

716 314

716 322

PDM08130-01X-45-G24T

PDM08130-01X-45-G24-Z4

716 315

716 323

PDM08130-01X-60-G24T

PDM08130-01X-60-G24-Z4

2.1.10 Type of connection

Suitable connection housings with

installation dimensions 08130 are

available.

See separate housing brochure

no.: E 5.252../..

2.1.11 Nominal size

NG = 08

E 5.168.3/12.03

2.2. HYDRAULIC DETAILS

2.2.1 Nominal pressure

Inlet (port 2) ... up to 80 bar

Outlet (port 1)

depending on pressure range

2 min

> p

Port 3 no pressure to tank

2.2.2 Operating pressure ranges

... up to 15 bar

... up to 25 bar

... up to 45 bar

... up to 60 bar

2.2.3 Operating fluid

Hydraulic oil to DIN 51524,

Part 1 and 2

HD oils.

2.2.4 Operating fluid

temperature range

Min. - 20 °C

Max. + 80 °C

2.2.5 Viscosity range

Min. 10 mm²/sec

Max. 380 mm²/sec

2.2.6 Flow rate

max

= 10 l/min

2.2.7 Filtration

Max. permissible contamination

level of the operating fluid to

ISO 4406 Class 18/16/13 -

19/17/14 (NAS 1638, Class 7-8).

We recommend a filter with a

minimum retention rate of

≥ 100.

The fitting of filters and regular

replacement of filter elements

guarantees correct operation,

reduces wear and tear and

increases the service life.

24 V / 8

ΩΩ

12 V / 3.1

ΩΩ

pressure range … 60 barpressure range … 60 bar

pressure range … 45 barpressure range … 45 bar

pressure range … 25 barpressure range … 25 bar

pressure range … 15 barpressure range … 15 bar

outlet pressure p in baroutlet pressure p in baroutlet pressure p in baroutlet pressure p in bar

outlet pressure p in bar outlet pressure p in bar outlet pressure p in bar outlet pressure p in bar

2.2.8 p-I graphs

(measured at ν = 71 mm²/s;

t = 30 °C; Q = 0 l/min;

fc = 160 Hz; p

= 100 bar)

Internal tolerances for each valve

+ 3 / - 8 % of the max. value

l in A

E 5.168.3/12.03

3. DIMENSIONS

INSTALLATION DIMENSIONS 08130

Geometry

2.2.9 Hysteresis

≤ 5 %

2.3. TYPE OF OPERATION

2.3.1 Type of construction

Electro-magnetic by means of a

pressure-tight, wet-pin single

stroke proportional solenoid

2.3.2 Type of voltage

2.3.3 Controlling current range

G12: 0 ... 1900 mA

G24: 0 ... 1200 mA

2.3.4 Coil resistance

G12: R20 = 3.1 Ohm

G24: R20 = 8 Ohm

2.3.5 Switch-on time

100 %

2.3.6 Safety type

IP65 to DIN 40050 for correctly

fitted plug

PDM 08130

Tool Stock no.

Countersink 169 265

Reamer 163 639

Tap 1002648

Plug gauge 163 641

Cartridge form tools

after loosening the nut,

the coil can be rotated through 360°

and removed IP65

fitting depth

R 0.4 max

E 5.168.3/12.03

4. CONTROL ELECTRONICS

4.1. ELECTRONIC AMPLIFIER - TYPE OF CONSTRUCTION

PEK PES PEM

PES: Plug amplifier for

fitting directly onto valve

solenoids

– suitable for fitting onto solenoid

for valve type ...G24-Z4

– compact component, can be

separated from the solenoid

system

– low-loss PDM output stage

– differential input (0 - 10 V)

– reverse polarity protected and

short-circuit proof

– LED display for control start

– base, step and maximum current

adjustable

PEK: 19” Euro card system

– plug connector: male multipoint

DIN 41612-D032

– Euro card system

100 x 160 mm

– 6 TE front plate width

(1 TE = 5.08 mm)

– low-loss PDM output stage

– differential input (0-10 V)

with level adjustment

– additional input for direct

potentiometer connection

– 2 independently adjustable

ramp times

– LED display for supply voltage

– base and maximum current

adjustable

– chopper frequency adjustable

PEM: Amplifier module

– can be mounted onto DIN EN

50022 rail and DIN EN 50035 rail

– compact construction

– replaces terminal strip

– low-loss PDM output stage

– differential input (0 - 10 V)

– reverse polarity protected and

short-circuit proof

– base, step and maximum current

adjustable

E 5.168.3/12.03

PES

PEM

4.6. DIMENSIONS

PEK

Standard models:

Stock no. (= order no.) Model code

552 863 PEK-02X-G24

552 864 PES-02X-G24

552 865 PEM-02X-G24

Please quote stock no. when ordering.

Delivery for non-standard models is longer and the price is higher.

4.3. SUPPLY VOLTAGE

PEK: 24 V DC ± 10 % (permissible residual ripple 49 %)

PES: 20-32 V DC (permissible residual ripple 5 %)

PEM: 20-32 V DC (permissible residual ripple 5 %)

4.4. CURRENT OUTPUT

4.2. MODEL CODE

(also order example)

PES - 02 X - G24

Proportional electronic

amplifier construction

PEK = 19” Euro card system

PES = plug amplifier

PEM = amplifier module

Type

00 = not pre-set

02 = pre-set to suit PDM08130

Series

(determined by manufacturer)

Supply voltage

G24 = 24 V DC

PG threaded connection

4-core cable

approx. 2 m long

Amplifier type Base

current (mA)

Step

current (mA)

Maximum

current (A)

Chopper

frequ. (Hz)

Ramp times

up/down (sec)

PEK-00X-G24 0-500 – 0-1.6 50-200 0.1-10/0.1-10

PEK-02X-G24 200 – 1.2 160 0.1-10/0.1-10

PES-00X-G24 0-700 0-600 0-1.6 160 –

PES-02X-G24 200 0 1.2 160 –

PEM-00X-G24 0-700 0-600 0-1.6 160 –

PEM-02X-G24 200 0 1.2 160 –

4.5. REFERENCE INPUT

PEK: 0-10 V DC and direct potentiometer connection

PES: 0-10 V DC

PEM: 0-10 V DC

5. NOTE

The information in this brochure relates to the operating conditions and

applications described.

For applications or operating conditions not described, please contact the

relevant technical department.

Subject to technical modifications.