50 Return to Table of Contents V20.1
Note: FC stamped on
the on-board amp plate
stands for fail close.
DIN 24342 Proportional Flow Control Valve
✓ Standard ISO 7368 & DIN 24342 cavity & porting
✓ Control Areas provide 4 milliseconds response time
✓ Can close poppet under high load pressure
✓ Controlled by on-board electronics
✓ Reference signal options: voltage or current
Specifications
Proportional Flow Control Valve
The proportional flow control valve is a fail-close valve, which
means that if its requirements are not met, the valve will close.
The valve is controlled by on-board electronics.
The on-board electronics consists of a 4-way, 3 position + fail-
safe position, servo-proportional valve, a digital amplifier
(driver), and a transducer. The digital amplifier is attached to the
servo-proportional valve. The servo-proportional valve connects
to the transducer, which is connected to the proportional flow
control valve by a LVDT rod. The proportional flow control
valve and cover assembly is shown on pg. 51.
Note: The proportional flow
control valve assembly does NOT
come with the adapter/connector.
DIN 24342 Proportional Flow
Control
SIZES 16mm TO 50mm
5000 PSI
51 Return to Table of Contents V20.1
Proportional Flow Control Valve Specifications (Continued)
The digital amplifier controls all the functions for the whole proportional flow control valve
assembly. The transducer sends a signal to the digital amplifier that tells the digital amplifier how
far open the proportional flow control valve is in relation to the servo-proportional valve. The digital
amplifier will then control how much farther the proportional flow control valve will open. The
settings for the digital amplifier are set at Almo so that it is ready for operation when the valve
arrives.
Voltage Reference Signal – E0 Option
For this option, all you need to provide is a 0-10-volt command, which is proportionate to the
position of the valve. No additional amplifier card is needed. The valve requires a 24-volt supply
with a minimal electrical current of 3 amps per valve. It also must have a minimum pilot pressure of
40 psi. If the voltage or pressure drops below the minimum requirement, the valve shifts closed to
safe mode. There is more information about this option on the next page.
Current Reference Signal – E1 Option
You will need to provide a 4-20 mA command, for this option, which is proportionate to the
position of the valve. No additional amplifier card is needed. The valve must have a 24-volt supply
with a minimum electrical current of 4 mA per valve. It also requires a minimum pilot pressure of
40 psi. The valve will shift closed (safe mode) if the voltage or pressure drops below the minimum
requirement. The next page has more information about this option.
Repeatability 0.1%
Hysteresis 0.2%
Transducer
Digital Amplifier
Servo-Proportional
Valve
Adapter/Connector
Location
Proportional Logic
Valve and Sleeve
52 Return to Table of Contents V20.1
Proportional Flow Control Valve Performance Curves
Proportional Flow Control Valve Application Data
All pressure drops shown on this page and the following page are based on 170 SUS fluid viscosity and
0.87 specific gravity. For any other specific gravity (G1), the pressure drop (ΔP) will be approximately
ΔP1 = ΔP (G1/G). See the chart below for other viscosities.
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 G). For the use of other
kinds of fluids, such as, HFA, HFB, and HFC, please contact our technical department.
Note: Using fluids at temperatures >180°F can damage the seals more quickly, as well as, cause
degradation of the fluid’s physical & chemical properties. For safety, temperatures >130°F are not
recommended.
53 Return to Table of Contents V20.1
Proportional Flow Control Valve Performance Curves (Continued)
The following curves are obtained with mineral oil viscosity of 170 SUS (36 cSt) at 122°F (50°C) and dedicated OBE.
Due to inherent phase lag characteristics of the overall system and machine, common industrial control practices
recommend, as rule of thumb, to utilize the phase lag frequency ratings of 45° or less when applying Servo and
Proportional valves to any position control loop for stable, repeatable, and consistent control.
54 Return to Table of Contents V20.1
A
D
C
B
E
F
Proportional Flow Control Valve Specifications (Continued)
Voltage Reference Signal – E0 Option
For this option, the command signal required is ±10 volts. The monitor signal is also ±10 volts,
which is available 0.5 seconds after the card is powered on OBW/OBM.
Pin
Value
OBC
OBW
OBM
A
24V DC
Supply voltage
B
0V
C
Enable
24V DC
Not used
-
Pin F reference
0V
D
±10V
Command (differential input)
E
0V
Pin D reference
F
± 10V
Monitor (0V reference: pin B)
Monitor
PE
GND
Ground (Earth)
Current Reference Signal – E1 Option
For this option, the command signal required is 4-20 mA. If the current drops below 4 mA, the card
will shut down until the applied signal is back in the range of 4-20 mA. The monitor signal is 4-20
mA and is available 0.5 seconds after the card is powered on OBW/OBM.
Pin
Value
Version A
Version B
Version C
A
24V DC
Supply voltage
B
0V
C
Enable
24V DC
Not used
-
Pin F reference
0V
D
4-20 mA
Command (differential input)
E
0V
Pin D reference
F
4-20 mA
Monitor (0V reference: pin B)
Monitor
PE
GND
Ground (Earth)
55 Return to Table of Contents V20.1
General Layout
Cover Size
A
B
C
D
Bolts
16 mm
4.85”
7.85”
11.76”
2.75”
5/16-18 X 5.75" (4)
25 mm
4.85”
8.43”
11.76”
3.50”
1/2-13 X 5.75" (4)
32 mm
4.85”
8.93”
11.76”
4.00”
5/8-11 X 6.00" (4)
40 mm
4.85”
9.93”
11.76”
5.00”
3/4-10 X 6.25" (4)
50 mm
4.85”
10.35”
11.76”
5.55”
3/4-10 X 6.25" (4)
Order Code
AMT-PFC-**-**-**
Proportional
Flow
Control
Size: 16, 25, 32. 40, or 50mm
BL= Include bolts
at extra charge
Blank= Customer will
supply bolts
Almo
Manifold
& Tool
Reference Signal:
E0 = Voltage ± 10 V
E1 = Current 4-20 mA
