MDM PROPORTIONAL PRESSURE-REDUCING VALVE

Electrical operation

Size 5

Series MDM-5

FEATURES

* Pressure reducing over the whole range independent of the supply pressure.

* Several sub-plates available.

* Conversion to ISO/CETOP mounting surface.

* Several control pressure ranges available.

* Different pressure ranges for the two pilot lines possible.

* Proportional solenoids with longer life for the armature in the oil.

* Several types of proportional solenoids, such as explosion proof “II 2 G EEx m II T4” and IP67.

* Adjustable valve response time.

TECHNICAL DATA

- maximum operating pressure conn. P 350 bar (5000 psi)

- maximum return pressure conn. T 15 bar (215 psi)

- pressure range conn. A and B 0 - 12 bar (0- 172 psi) or 0 - 30 bar (0- 429 psi)

0 - 70 bar (0-1000 psi) or 0 - 120 bar (0-1716 psi)

0 - 190 bar (0-2717 psi) or 0 - 350 bar (0-5000 psi)

- flow range 6 l/min (1.6 USgpm) with 32 cSt and ∆p = 30 bar (429 psi)

- viscosity range 2,8 - 380 cSt

- contamination level max. NAS 1638 class 9 or ISO 18/15

- ambient temperature -35°C to +80°C (-31°F to 176°F)

- mounting position any

- fluid mineral oil; other media on request

- mounting surface roughness N6 (0,8 µm) according to ISO 468 and ISO 1302.

- mounting surface flatness 0,01 mm over a distance of 100 mm according to ISO 1101.

- nominal voltage 12 V DC, 24 V DC

- nominal current see diagrams Fig. 1 and 2

- valve response time adjustable: ± 0,08 - 10 seconds

- hysteresis < 3% (with dither)

- resolution < 0,5% (with dither)

- continuous operation 100%

- seals std. BUNA-N, optional Viton

- recommended dither frequency 100 Hz

DIAGRAMS

Publ.MDM-5-03-06

ORDERING CODE

MDM 5

MDM - 5 - 70

- 190 - B / Viton

SERIES

MDM-5

CONTROL PRESSURE RANGE, DUAL TYPE:

Port A in bar

*: 12, 30, 70, 120, 190 or 350 bar

CONTROL PRESSURE RANGE,

Port B in bar: 12, 30, 70, 120, 190 or 350 bar

SOLENOID TYPE

A = 12V DC IP65 with emergency control by pin

B = 24V DC IP65 with emergency control by pin

E = 12V DC IP65 with emergency control by button

F = 24V DC IP65 with emergency control by button

H = 24V DC IP57 II 2 G EEx m II T4 (Explosion Proof)

J = 24V DC IP67, without female connector

OPTIONS

Viton = With Viton seals

SUB-PLATE

A-5-DM - 3

/ Viton

SERIES

A-5-DM = Sub-plate

NUMBER

1-8 = choose number of MDM-5 valve which

has to be mounted on one subplate (up to 8)

OPTIONS

SAE = S.A.E. straight thread 'O'RING BOSS

Viton = With Viton seals

CONVERSION PLATE

A-5-PS / Viton

SERIES

A-5-PS = Conversion to ISO/CETOP 3 model

OPTIONS

iton = With Viton seals

DUAL TYPE

Example: MDM-5-70-70/B

* only in code for dual type

SINGLE TYPE

Example: MDM-5-350/B

SUBPLATE

CONVERSION PLATE

R - .. - 016

R SPARE KIT

01 SEALS (BUNA-N)

06 ASSEMBLY KIT:SEALS (BUNA-N) AND SCREWS

11 SEALS (VITON)

16 ASSEMBLY KIT:SEALS (VITON) AND SCREWS

SOLENOID, incl. bolts and seal

8WX-2170-002 = 12V DC IP65 with emergency control by pin

8WX-2170-001 = 24V DC IP65 with emergency control by pin

8WX-2170-012 = 12V DC IP65 with emergency control by button

8WX-2170-011 = 24V DC IP65 with emergency control by button

8WX-2270-051 = 24V DC IP57 II 2 G EEx m II T4 (Explosion Proof)

8WX-2270-041 = 24V DC IP67, without female connector

RECOMMENDED SPARE PARTS

DIMENSIONS / TIGHTENING TORQUES

MDM-5 Single Type Dual Type

dimensions in millimeters (inches)

6 Nm (4.4 lb ft): 4 x M5

solenoid b

88(3.46)

56(2.20)

33(1.30)

63,5(2.5)

Ø5,4(0.21)

Ø9,4(0.37)

33(1.30)

133,5(5.26)

60(2.36)

10(0.39)

solenoid asolenoid b

63,5(2.5)

33(1.30)

Ø5,4(0.21)

60(2.36)

187(7.36)

Ø9,4(0.37)

33(1.30)

56(2.20)

63,5(2.5)

88(3.46)

8(0.32)

2,9 Nm (2.1 lb ft)

B,P: Ø5(0.2)

T: Ø4(0.16)

17(0.67)17(0.67)

9,5(0.37)

19(0.75)

13 (0.51)

30 (1.18)

13 (0.51)

30 (1.18)

5(0.2)

23(0.91) 23(0.91)

8(0.32)

A,B,P: Ø5(0.2)

T: Ø4(0.16)

19(0.75)

23(0.91)

30 (1.18)

13(0.51)

30 (1.18)

5(0.2)

17(0.67)

9,5(0.37)

SUBPLATE: A-5-DM

48(1.89)

30(1.18)

60(2.36)

48(1.89)

11(0.43)

12,5(0.49)

4,5(0.18)

25(0.98)

23(0.91)

12(0.47)

11(0.43)

27,5(1.08)

48(1.89)

8(0.32)

48(1.89) 48(1.89)

18,5(0.73)

11(0.43)

25(0.98)

40(1.57)

23(0.9)

18,5(0.73)

22(0.87)

M6 (4x or 6x), 9 (0.35) dp.

A1 A2

B2 B6

A6A5

B5B4

A4A3

4,5(0.18)

8(0.31)

abc

A-5-DM-1: 80(3.14) 30 (1,18) - Connecting threads: P,T,A,B

A-5-DM-2: 128(5.04) 78 (3,07) - in BSP: 1/4” (standard)

A-5-DM-3: 176(6.96) 126 (4.96) - in SAE: SIZE 6 (optional)

A-5-DM-4: 224(8.82) 174 (6.85) -

A-5-DM-5: 272(10.71) 222 (8.74) 126 (4.96)

A-5-DM-6: 320(12.6) 270 (10.63) 126 (4.96)

CONVERSION PLATE: A-5-PS

65(2.56)

21(0.83)

28(1.10)

49(1.93)

Ø5,4(0.21)

Ø9(0.35)

MAINTENANCE DATA

Mounting procedure

MCA-valves shall not be mounted by

overtightening of mounting bolts, causing

mechanical distortion and thus spool lock.

- Mounting on flat surface, flatness 0,01/100.

- Don’t use conical thread for port-fittings.

- For sealing purposes, use O-rings.

- Check the voltage andcurrent of the solenoids,

before operation.

void ingression of contaminants during

mounting.

Start-up procedure

- Check the valve-function and thetightness of

fittings etc.

- Bleed by repeated energizing of solenoid(s).

- Run the system to raise the fluid temperature.

Rebleed to remove the dissolved air.

Adjustment procedure

Valve response time:

The valve response time isadjustable from

± 0,08 - 10 seconds.

djustment screws (damping throttles) are on the

MDM-5 valve below the solenoids , fig 12 (1).

- Turn the adjustment screws clockwise to enlarge

valve response time.

- Turn the adjustment screws anti-clockwise to

shorten valve response time.

Fluid maintenance

Due to the construction, these

MCA-valves, are

not highly susceptible to particulate (silt type)

lock, nor to contaminant wear. Therefore the

contaminant sensitivity is very low.

- Use mineral oil (recommended ISO/VG-32).

Other fluids on request.

- Keep the contamination level better or equal NAS

1638 class 9 or ISO 18/15.

TROUBLE SHOOTING

1) Damping throttle

2) Spool

3) Pistons

FIG. 12

A. Valve operates erratically

1) Check the current on the solenoid plug.

2) Air in system: Bleed by repeated energizing of

solenoid(s). Run the system to raise the fluid

temperature. Rebleed to remove the dissolved air.

3) Check the resistance of the solenoid coil:

- 24 VDC at 20

o C (68 o F) = 25 Ohm,

at 60

o C (140 o F) = 30 Ohm

- 12 VDC at 20

o C (68 o F) = 6,5 Ohm,

at 60 o C (140 o F) = 7,5 Ohm

3) Spool, pistons or solenoids are dirty: Remove

solenoids or cover and clean solenoids’ bore and

spool (take care of the small pistons (3) in the

spool (2) if placed, see fig.12).

C. System is too slow

1) Damping throttles are closed too much: open up

the throttles.

2) Electrical fault (ramp generator): check and reset.

3) Damping throttle or spool are dirty: Remove the

parts, 1, 2 and 3, clean everything and replace.

B. Max. reducing pressure too low

1) Maximum current is faulty: check max. current.

2) Supply pressure is too low: Check system

pressure.

AMCA Hydraulic Fluid Power BV

B.Kuiperweg 33, 9792 PJ TEN POST

P.O.BOX 18, 9790 AA TEN BOER

The Netherlands

Tel.: +31 (0)50 - 3023577

Fax.: +31 (0)50 - 3021226

e-mail: sales@amca-nl.com

homepage: http:// www.amca-nl.com

Your local representative