81 210/115 ED

1/4

— The PRED3 valve is a direct operated pressure control

valve with electric proportional control and mounting

interface in compliance with ISO 4401 (CETOP RP 121H)

standards.

— It is suitable to pilot two-stage valves, or for pressure

control in hydraulic circuits.

— Pressure can be modulated continuously in proportion to

the current supplied to the solenoid.

— The valve can be controlled directly by a

current control supply unit or by means of the

relative electronic control units to exploit valve

performance to the full (see par. 8).

— The valve is available in four pressure

control ranges up to 350 bar.

0.750.75

31.7531.75

25.925.9

15.515.5

5.15.1

12.712.7

3131

M5M5

ø4ø 4

ø7.5(max)ø7.5(max)

21.521.5

30.230.2

40.540.5

3333

PRED3

DIRECT OPERATED PRESSURE

CONTROL VALVE WITH ELECTRIC

PROPORTIONAL CONTROL

SERIES 10

HYDRAULIC SYMBOL

MOUNTING SURFACE OPERATING PRINCIPLE

ISO 4401-03-02-0-05

(CETOP 4.2-4-03-350)

81 210/115 ED

SUBPLATE MOUNTING

ISO 4401-03 (CETOP 03)

p max

350 bar

Q max 3 l/min

Maximum operating pressure:

- P port

- T port

bar 350

Minimum controlled pressure see p min = f(Q) diagram

Nominal flow

Maximum flow (see p min = f(Q) diagram)

l/min

Step response see paragraph 5

Hysteresis (with PWM 200 Hz) % of p nom < 5%

Repeatability % of p nom < ±1,5%

Electrical characteristic see paragraph 4

Ambient temperature range °C -20 / +60

Fluid temperature range °C -20 / +80

Fluid viscosity range cSt 10 ÷ 400

Fluid contamination degree

According to ISO 4406:1999

class 18/16/13

Recommended viscosity cSt 25

Mass kg 1,5

PERFORMANCES

(obtained with mineral oil with viscosity of 36 cSt at 50°C and electronic control cards)

81 210/115 ED

2/4

PRED3

SERIES 10

100 200

120

150

[bar]

I[mA]

300 400 860500 600 700 800

140

070

140

100 200

210

280

350

[bar]

I[mA]

300 400 860500 600 700 800

350

210

1 - IDENTIFICATION CODE

Seals:

N = NBR seals for mineral oil (standard)

V = FPM seals for special fluids

Series No. (the overall and mounting dimensions

remain unchanged from 10 to 19)

Electrical proportional control

Size ISO 4401-03 ( CETOP 03)

direct operated

Pressure control range

070 = 0,7 - 70 bar 210 = 1,8 - 210 bar

140 = 1,1 - 140 bar 350 = 2,8 - 350 bar

D12 = Nominal solenoid voltage 12V DC

D24 = Nominal solenoid voltage 24V DC

Coil electrical connection:

plug for connector type

DIN 43650 (standard)

Pressure control

valve

PRESSURE CONTROL p = f(I)

2 - CHARACTERISTIC CURVES

(measured with viscosity of 36 cSt at 50°C)

Typical control curves according to the current supplied to the solenoid for pressure control ranges: 070, 140, 210, 350, measured with input

flow rate Q =1 l/min.

The curves are obtained without any hysteresis and linearity compensation and they are measured without any backpressure in T. The full

scale pressure is set in factory with a flow rate of 1 l/min. In case of higher flow rate, the full scale pressure will increase considerably (see

diagram pmax = f (Q) ).

Q = 1 lt/min

factory setting

MINIMUM CONTROLLED PRESSURE p min = f (Q) PRESSURE VARIATION p max = f (Q)

RP E D 3

/ 10 - K1

81 210/115 ED

3/4

PRED3

SERIES 10

4 - ELECTRICAL CHARACTERISTICS

Proportional solenoid

The proportional solenoid comprises two parts: tube and coil.

The tube, screwed to the valve body, contains the armature which

is designed to maintain friction to a minimum thereby reducing

hysteresis.

The coil is mounted on the tube secured by means of a lock nut and

can be rotated through 360° depending on installation clearances.

5 - STEP RESPONSE

(obtained with mineral oil with viscosity of 36 cSt at 50°C and electronic

control cards)

Step response is the time taken for the valve to reach 90% of the

set pressure value following a step change of reference signal.

The table illustrates typical step response times measured with a

valve of pressure range up to 140 bar and with an input flow rate of

Q = 2 l/min.

6 - INSTALLATION

We recommend to install the PRED3 valve either in horizontal

position, or vertical position with the solenoid downward. If the valve

is installed in vertical position and with the solenoid upward, you

must consider possible variations of the minimum controlled

pressure, if compared to what is indicated in paragraph 2.

Ensure that there is no air in the hydraulic circuit. In particular

applications, it can be necessary to vent the air entrapped in the

solenoid tube, by using the apposite drain screw in the solenoid

tube. Ensure that the solenoid tube is always filled with oil (see par.

7). At the end of the operation, make sure of having screwed

correctly the drain screw.

Connect the valve T port directly to the tank. Add any backpressure

value detected in the T line to the controlled pressure value.

Maximum admissible backpressure in the T line, under operational

conditions, is 2 bar.

Valves are fixed by means of screws or tie rods on a flat surface

with planarity and roughness equal to or better than those indicated

in the relative symbols. If minimum values are not observed, fluid

can easily leak between the valve and support surface.

Surface finishing

3 - HYDRAULIC FLUIDS

Use mineral oil-based hydraulic fluids HL or HM type, according to ISO 6743-4. For these fluids, use NBR seals. For fluids HFDR type

(phosphate esters) use FPM seals (code V). For the use of other kinds of fluid such as HFA, HFB, HFC, please consult our technical

department.

Using fluids at temperatures higher than 80 °C causes a faster degradation of the fluid and of the seals characteristics. The fluid must be

preserved in its physical and chemical characteristics.

REFERENCE

SIGNAL STEP

0 → 100% 100 → 0%

Step response [ms] 80 40

NOMINAL VOLTAGE

V DC

12 24

RESISTANCE (at 20°C)

Ω 3.66 17.6

NOMINAL CURRENT

A 1.88 0.86

DUTY CYCLE

100%

ELECTROMAGNETIC

COMPATIBILITY (EMC)

According to

2004/108/EC

CLASS OF PROTECTION:

atmospheric agents (CEI EN 60529)

coil insulation (VDE 0580)

Impregnation

IP 65

class H

class F

81 210/115 ED

4/4

DUPLOMATIC OLEODINAMICA S.p.A.

20015 PARABIAGO (MI)  Via M. Re Depaolini 24

Tel. +39 0331.895.111

Fax +39 0331.895.339

www.duplomatic.com  e-mail: sales.exp@duplomatic.com

PRED3

SERIES 10

REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS.

7.5

11.2

142

22.5

83.5

7.5

149.5

7 - OVERALL AND MOUNTING DIMENSIONS

PMMD-AI3G with ports on rear

PMMD-AL3G with side ports

Ports dimensions: P, T, A, B: 3/8” BSP thread

dimensions in mm

NOTE: at the first start up, or after a long period of no use, it

is necessary to vent the air through the breather (3) placed at

the end of the solenoid tube.

8 - ELECTRONIC CONTROL UNITS

EDC-112

for solenoid 24V DC

plug version

see cat.

89 120

EDC-142

for solenoid 12V DC

EDM-M112

for solenoid 24V DC

DIN EN 50022

rail mounting

see cat.

89 250

EDM-M142

for solenoid 12V DC

Mounting surface with sealing rings:

4 OR type 2037 (9.25 x 1.78) - 90 shore

Coil removal space

Breather (Allen key 4)

Factory setting sealing

(we recommend not unscrewing the nut)

DIN 43650 electric connector

(included in the delivery)

Connector removal space

Valve fastening: 4 SHC screws M5x30 - ISO 4762

Tightening torque: 5 Nm (A 8.8 screws)

Threads of mounting holes: M5x10

9 - SUBPLATES

(see catalogue 51 000)