PROPORTIONAL
VALVE
7
7
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0001
DESCRIPTION
ORDERING CODE
Valves HD3-PS are proportional directional control valve with
subplate mounting interface acc. to ISO 4401, DIN 24340 (CETOP
03).
The design of the body is an high quality five chamber casting. The
valve is available with different spools able to control different flow
ranges. In the standard version, the valve housing is phosphated
for 240 h salt spray protection acc. to ISO 9227.
1
2
PROPORTIONAL 4-WAY CONTROL VALVES SOLENOID OPERATED
HD3-PS-*
32 l/min 32 MPa (320 bar)
(1)
HD3 -
(3)
-
-
/
(4)
(5)
(6)
10
-
(2)
PS
(1) 4-way directional valve CETOP 03 – Pressure 32 MPa (320 bar)
(2) PS : Proportional electric control
(3) Functional spool type (see
4
):
-number is the main spool type
1: closed center (P, A, B, T blocked)
3: P blocked, A, B, T connected
-spool nominal flow
P : 32 l/min with P = 1 MPa (10 bar) (PA+BT or PB+AT)
R : 16 l/min with P = 1 MPa (10 bar) (PA+BT or PB+AT)
05 : 05 l/min with P = 1 MPa (10 bar) (PA+BT or PB+AT)
D : differential Qb = 2Qa: 32/16 l/min with P = 1 MPa (10 bar)
-letter is the solenoid or spring arrangement:
C : 2 solenoids, spool is springs centred
ML : 1 solenoid (“a”) spool is centred + 1 end position
MLb : 1 solenoid (“b”) spool is centred + 1 end position
(4) Options and variants:
K : extended manual overrides (see
7
)
AK : extended manual overrides with air bleeding valves (see
8
)
ZC : zinc plated valves (see
9
)
(5) Type of coil and supply voltages
R2 : R= 2,3 standard for V12DC; R3 : R= 4,5
R4 : R=13,4 standard for V24DC; R5 : R=18,6
(6) Design number (progressive) of the valve.
The spool 12 shifts in to the valves body 11 subject to the action of springs 13 and
proportional solenoid 1. Spool 12, depending from its shape and its position in
the valves body 11, opens and/or closes passages between P, A, B, T ports, thus
controlling the direction and the rate of the hydraulic flow. Solenoid 1 is energized
by electric current flowing-in through cables; in case of electric cut-offs, the spool
can be manually shifted by acting on the emergency pins 5, located at the end of
the solenoids and accessible through the retaining nuts 10.
5,1
15,5
25,9
31
31,75
32,5
0,75
12,7
21,5
30,2
33
40,5
4
M5
7,5 MAX.
51 min.
43 min.
T
A
B
P
ISO 4401-03
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0002
TECHNICAL DATA
SPOOL IDENTIFICATION AND NOMINAL
FLOW RATE
3
4
Nominal flow rates 5, 16, 32 l/min Electric Characteristics:
Maximum nominal pressure (P,A,B) 32 MPa (320 bar) Valves type HD3-PS-* are operated by proportional solenoids that are rated for an average
max power of 13,5 w. The values of nominal max. current are:
for coils type R2 ( 2,3 ω): I max = 2,4 A
R3 ( 4,5 ω): I max = 1,7 A
R4 (13,4 ω): I max = 1,0 A
R5 (18,6 ω): I max = 0,85 A
Currents to hydraulic proportional valves are normally supplied by an electronic driver based
on PWM mode of operation, capable of full control of min and max values of current for driv-
ers type UED-*
Maximum pressure at T port 16 MPa (160 bar)
Maximum rec. Pressure drops 10 MPa (100 bar) see
8
Protection DIN 40050 IP 67
Duty cycle 100%
Service life > 10
7
cycles
Installation and Dimensions
(see
10
)
Mass Approx 1,6 / 2,1 kg.
TYPICAL DIAGRAMS
5
0 20 40 60 80 100
0
8
16
24
32
l max %
Flow (l/min)
P
R
05
Typical flow curves of valves HD3–PS-*, with spools type P, R, 05, in standard
configuration measured with mineral oil at 36 cSt and at 50°C at δP=01 MPa
(10 bar) for flow P->B A -> T
FLOW RATES AND PRESSURE DIFFERENTIAL
6
For a given δP on a given valve the flow rates are proportional to the driving current; for a given driving current on a given valve, the flow rates increase with the
increasing of the δP up to certain limits. Typical limit curves are:
Flow Q [L/min]
Input pressure p
o
[bar]
Solenoid current:
1 = 40%
2 = 60%
3 = 80%
4 = 100%
Flow Q [L/min]
Input pressure p
o
[bar]
Nominal flow 16 L/min Nominal flow 32 L/min
Nominal flow 5 L/min
Flow Q [L/min]
Input pressure p
o
[bar]
Solenoid current:
1 = 40%
2 = 60%
3 = 80%
4 = 100%
Flow Q [L/min]
Input pressure p
o
[bar]
Nominal flow 16 L/min
Nominal flow 32 L/min
Nominal flow 5 L/min
Flow Q [L/min]
Input pressure p
o
[bar]
Solenoid current:
1 = 40%
2 = 60%
3 = 80%
4 = 100%
Flow Q [L/min]
Input pressure p
o
[bar]
Nominal flow 16 L/min
Nominal flow 32 L/min
Nominal flow 5 L/min
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0003
VERSION “K”: EXTENDED EMERGENCY PIN
VERSION “AK”: EXTENDED PIN AND AIR VALVES
INSTALLATION DIMENSIONS (mm)
HYDRAULIC FLUIDS PRESSURE COMPENSATOR MODULES.
VERSION “ZC”: ZINC PLATED VALVES
7
8
10
11 12
9
Solenoid valves according to “K” version have extended emergency actuator pins protruding from the solenoid
shape, that permit a quick and easy “Hand operation” of the valves, without the need of any tool. The actuator
pin and the end of the solenoid are protected by a flexible rubber cap that makes easy operation and protects
from moisture and water splashes.
Proportional valves according to “AK” version have extended emergency actuator pins that incorporate air
bleeding valves, to purge air from the solenoid tube for a simplified start-up of the system. The actuator pin
and the end of the solenoid are protected by a flexible rubber cap that makes easy operation and protects
from moisture and water splashes.
All valves HD3-* conform with ISO and CETOP specifications for
mounting surface dimensions (see also front page) and for valves
height. When assembled to its mounting plate valve HD3-* must
be fastened with 4 bolts M5 X 45 mm (or M5 x ** according to the
number of modules) tightened at 8 Nm torque. Of special interest is the
mounting of pressure compensator modules with HD3-P proportional
valves. Leakage between valve and mounting surface is prevented by
the positive compression on their seats of 4 seals of QUAD/O Ring type
9,25x1,68x1,68.
Seals and materials used on
standard valves HD3-* are
fully compatible with hydraulic
fluids of mineral oil base,
upgraded with antifoaming
and anti-oxidizing agents.
The hydraulic fluid must be
kept clean and filtered to ISO
4406 class 19/17/14, or better,
and used in a recommended
viscosity range from 10 cSt to
60 cSt.
Solenoid valves according to “ZC” version have central body zinc plated and protected against every type of corrosion due to saline ambiance or other
aggressive chemicals. Zinc thickness are on the valve body: 10-15 m; and 8/12 m on solenoids.
2-way pressure compensator for meter-in
application type AM3-PCP – see table AM-391.
When using the 2-way pressure compensators in
meter-in application, shown in the circuit diagram,
a constant pressure difference across the metering
edge of the proportional direction valve is held. In
this case, the pressure variations due to loading
changes, as well as pump pressure changes, are
compensated. That means that a pressure change
cannot result in flow increase. 3-way pressure
compensator type AM3-LS-P is able to operate
as “load sensing” device, by ischarging at T port,
at the same pressure of the user, the flow that
exceeds the flow rates required by the controlled
opening of the proportional 4-way valve.
12 37
N°4
5,3
10
8,5
150
88
45
49
56
0,75
12,5 40,5 15
73,5 68
52 21,5
73,5
32,5 6,25 6,25
45
12,7
21,5
30,2
5,1
15,5
25,9
31
215
N°4 OR 2037
P
T
A B
12 37
N°4
5,3
10
8,5
150
88
45
49
56
0,75
12,5 40,5 15
73,5 68
52 21,5
73,5
32,5 6,25 6,25
45
12,7
21,5
30,2
5,1
15,5
25,9
31
215
N°4 OR 2037
P
T
A B
V1-17 V1-17
