21
180
°
from the position shown in Figure 13a. Wire grounding
screws are provided for convenience.
g.
Manual Override
: Each solenoid (electrical or air
type) has a manual override plunger to shift the pilot spool.
This feature allows a technician to shift the pilot spool when
electricity or air pressure is not available. Refer to Figures
13a, 13b or 13c. To operate the manual override feature,
obtain a small rod and push in on the plunger.
5.
Accessories for Electrical Type Solenoids
: The
model code (Table 2) indicates the type of accessories used
on directional valves. Obtain a parts and service drawing for
your particular model (see Table 1). Most accessories
pertain to the pilot section. The most common types of
accessories are discussed in the following paragraphs (a
through f).
a.
Hazardous Location Solenoids
: This type of
solenoid is used at locations where added protection from
electrical shortage failure is manditory. The solenoid housing
is designed to completely enclose all wiring connections to
the valve. Hazardous location valves are underwriters
approved Class 1, Group D or Class 2, Group E-F-G, for 115
and 230 volts, 60 Hz service.
Valves for mining applications are built to the Bureau of
Mines schedule 2G-File X/P 837-2 and are available in all
standard voltages. Refer to parts drawing (Table 1) for
further information.
b.
Monitor (Limit) Switch Feature
: The monitor
switch feature can be incorporated into a basic spring offset
directional valve. The switch monitors valve spool position
and can be wired into control circuits. This permits electrical
interlocking of various hydraulic controlled motions without
resorting to external mechanical arrangements. The monitor
switch is a single pole, double throw contact arrangement
with “A”- normally closed and “B”- normally open. Switch
ratings are noted on installation drawing (Table 1). The
monitor switch housing does not provide a manual plunger
for operation of the switch or valve.
c.
Insta-Plug Connectors
: Pilot valves can be
supplied with electrical connectors called insta-plugs. These
connectors allow quick disconnect of electrical power from the
valve. The following data pertains to the insta-plug feature:
PA
- A prefix of PA in the model code indicates
the male plug section of the insta-plug feature is included
on the valve.
PB
- A prefix of PB in the model code indicates
both the male plug and female receptacle are included with
the valve. The insta-plug feature is available on both the
DG4V-3 and DG4S4-01 series directional valve.
WIRING NOTE
Connect white wires to “A” solenoid and black wires
to the “B” solenoid. Refer to parts drawing (Table 1)
for additional data.
d.
Brad Harrison Connectors
: Brad Harrison
connectors thread into the 1/2 NPTF opening in the wiring
housing of a DG4V-3 or a DG4S4-01 directional valve.
PA3
- A prefix of PA3 in the model code indicates
the three pin male connector is included with the valve.
PA5
- A prefix of PA5 in the model code indicates
the five pin male connector is included with the valve.
Female Brad Harrison
connectors are not
available from Vickers and must be supplied by the customer.
e.
Solenoid Indicator Lights
: Solenoid indicator
lights are available for installation on both the DG4V-3 and
DG4S4-01 series directional valves. Indicator lights are
connected across the solenoids and will light when voltage is
present at the solenoid. This gives an indication to the
technician which solenoid is energized and aids in
troubleshooting a system. Refer to the appropriate parts
drawing for additional information.
