FUNCTION
PILOT VALVE (CONTROL LEVER)
1
3
PILOT VALVE (CONTROL LEVER) 3K2AQ00
PILOT VALVE (CONTROL LEVER)
The pilot valve is a remote-controlled valve with a reducing
valve system used to operate the spool in the control valve.
The pilot valve comes with right and left control levers.
The pilot valve casing (1) contains a vertical shaft hole
that incorporates a reducing valve (2). When the lever (3)
is tilted, the push rod (4) and spring seat (5) are pushed
down, which changes the pressure of the secondary
pressure spring (6).
The casing (1) contains the oil inlet port P (primary pres-
sure) and the tank port T. The secondary pressure which
corresponds to changes in operating angle produced
using the lever (3) can be provided through the output
ports A and B located below the vertical shaft hole. The
secondary pressure functions as the pilot pressure to ac-
tivate the spool of the control valve.
When the lever (3) is in the neutral position:
The force of the spring (6) that determines the output
pressure (secondary pressure) of the pilot valve is not
conveyed to the spool (7). This causes the spool (7) to be
pushed up by the return spring (8) and spring sheet (5),
and the output ports A and B are connected to the tank
port T, which makes the pressures in the ports A and B
be equal to the pressure in the tank port T.
When the lever (3) is tilted:
When the lever (3) is tilted and the push rod (4) is
pushed, the spring sheet (5) and spool (7) move down-
ward, and the input port P is connected to the output port
A. The oil from the pilot pump then flows into the output
port A to generate a pressure.
3K2AQ01Z
3
2
P
AB
2
1
4
5
6
T
3K2AQ02Z
3
AB
7
P
5
6
8
T
3K2AQ03Z
3
AB
7
P
4
5
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