Proportional DCValve
Series D1FHInstallation Manual
3
IA D1FH UK A5.PM6.5 CM
Parker Hannifin GmbH
Hydraulic Controls Division
General Description
The Parker D1FH valve is a high response pro-
portional servo valve with an on-board drive
amplifier.TheD1FHincorporatestheuseofstate-
of-the art drive electronics with an LVDT for
continuous monitoring of the spool position. Zero
lapspoolsareavailableforclosedloopapplications
with two different 'power down' configurations.
The valve features frequency response levels
greater than 100 Hz, along with low hysteresis
and exellent repeatability.
Operation
The D1FH valve uses a precision lapped spool
and sleeve configured with four control positions.
During normal operation the valve will shift from
the center position to either side providing flow
out the 'A' or 'B' port. When the enable signal is
removed from the drive amplifier, the valve will
shift to a fourth position. The fourth position will
block all four ports in one version. A second
version that is available will block the 'P' port and
allow the 'A' and 'B' ports to bleed to the 'T' (tank
line).
Note
The tank line to the valve must have a minimum
pressureof(1.4bar).Maximumpressureis35bar
(500 PSI).
Features
• On-Board Electronic Drive Amplifier
Integral electronics eliminates the need for
costly wiring between the valve and driver
card. The unit is shipped as a factory preset
and tested unit.
• High Frequency Response
The valve features a very high frequency
response which is necessary for many closed
loop applications.
• Four Position Spool Capability
The four position spool provides predictable
flow in the event of a power failure to the
drive electronics, within the limits of the power
curve.
• 315 bar Pressure Capability
The maximum operating pressure rating for
the D1FH is 315 bar or 4500 PSI (40 L/M
version limited to 210bar).
• Spool Position Feedback
The LVDT continuous feedback monitoring
circuit provides low hysteresis and exellent
repeatability.
• Contaminant Sensitivity
The D1FH operates with standard mineral oil
based fluids with a cleanliness level of ISO
Class 16/13, SAE Class # 4.
• Drive Enable Feature
Outputtothecoilisshutdownwhentheenable
signal,(5 to30 VDC),is notpresent. Thevalve
will then shift to the fourth position flow path
selected by the user (E50 or E80 spool).
