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General Information
DG5S4-10**-** Pilot Operated Directional Valves
Basic Characteristics
Max. pressure: 207 bar (3000 psi)
Max. flow: 946 l/min (250 USgpm)
Max. pressure port T (external drain):
207 bar (3000 psi). . . . . . . . . . . . . . .
Max. pressure port T (internal drain):
DG5S4-10**-53 – 69 bar (1000 psi)
DG5S4-10**-80 – 69 bar (1000 psi)
DG5S4-10**-90 – 100 bar (1450 psi)
DG5S4-10**-100 – 207 bar (3000 psi)
Max. pilot pressure:
207 bar (3000 psi). . . . . . . . . . . . . . .
Weights: - See installation drawings.
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information.
Mounting Interface
ISO 4401-10
NFPA D10
Shifting Action
Spring centered, pressure centered and
spring offset models must be energized
continuously to maintain the shifted
position. Detented no-spring models
may be energized momentarily
(approximately 0.1 second).
Pressure centered and spring centered
models return valve spool to center
position when solenoids are de-energized.
Spring offset models return spool to
offset position by pilot pressure when
solenoid is de-energized.
When no-spring detented models are
de-energized, the pilot and main spools
remain in the last position attained,
provided there is no shock, vibration,
unusual pressure transients and the
spool axis is horizontal. If pilot pressure
fails or falls below the minimum, the
main spool will spring center (at spring
centered flow rates) and cannot drift to
reversal of flow (pilot stage remains in
detented position).
Caution
Because of this, flow conditions of
the spring centered position must be
selected with care, both for the effect
on the direction of the flow, and the
pilot pressure. (The “9” main spool
will not ensure sufficient pilot
pressure in the center position.)
Pressure centered models: Valve
spool is returned to center position
by pilot pressure, when solenoids
are de-energized. If pilot pressure
fails or falls below the required
minimum, the valve spool will spring
return to center position. (At spring
centered valve flow rates.)
Caution
Surges of oil in a common tank line
serving these and other valves can
be of sufficient magnitude to cause
inadvertent shifting of these valves.
This is particularly critical in the
no-spring detented type valves.
Separate tank lines or a vented
manifold with a continuous
downward path to tank is necessary.
NOTE
Any sliding spool valve, if held for
long periods of time, may stick and
not spring return due to fluid residue
formation and therefore, should be
cycled periodically to prevent this
from happening.
When used as other than a normal
4-way valve, consult your Vickers
representative.
Mounting Position
No-spring detented valves must be
installed with the longitudinal axis
horizontal for good machine reliability.
The mounting position of spring-offset
models is unrestricted provided that the
pilot pressure supply is maintained as
required. (Spring offset valves do not
have a spring in the main spool section.)
Installation Data
Pilot Valve Drain
Internal: To provide maximum flow
without malfunction, pilot pressure of
internally drained valves must always
exceed tank line back pressure by a
minimum of 5,2 bar (75 psi) for spool
types 0, 4, 8 & 9 and a minimum of 10,3
bar (150 psi) for all other spools.
Internal drain may be used with all
valves, however, an integral pressure
port check valve (see optional check
valve note) is required for valves using
an internal pilot source with an open
center spool (0, 4, 8 and 9 types) in
order to maintain pilot pressure. If an
external pilot source is used then an
integral check is not required. When
internal pilot drain is required, order
according to model code. (Pressure
centered valves not included.)
External: When the possibility of
pressure surges in the tank line exists,
externally drained valves are
recommended. For externally drained
models, the pilot valve drain line must
be piped directly to tank through a
surge-free line so there will be no back
pressure at this drain. (Reference
connection “Y”.)
Pressure Centered Drain
(external only)
External pilot drain explanation above
applies to “Y” drain port. Pressure centered
“W” drain connection must be piped
directly to tank through a surge free line so
there will be no back pressure at this drain.
Optional Features
Pressure Centered Valves
Integral Check Valves
Fast Response
Electrical Options
Service Information
Refer to specific Vickers parts drawing
for service parts information. A complete
parts breakdown is contained in this
drawing.
Order by literature number.
DG5S4-10*(A/B/C/F/N)-*-90/100 I-3890-S. .
DG5S4-10*(A/B/C/N)-*-80 I-3883-S. . . . . . . .
DG5S4-10*(A/B/C/N)-*-5* I-3624-S. . . . . . . .
DG5S4(L)-10*D(X)-*-5* I-3625-S. . . . . . . . . .
DG5S4-10**-**DC-5* I-3499-S. . . . . . . . . . . .
XDG5S4-10**-5* I-3501-S. . . . . . . . . . . . . . . .