Hydraulics QUANTUM TIC
11-88 10/04
4.3 Circulation valve with pressure relief valve
P Tractor port (feed line)
T Tractor port (return line)
Y Control bore
5 Circulation valve spool
6 Orifice plate
7 Shut-off screw
8 Pressure relief valve (200 bar)
LS Load sensing port
Circulation The shut-off screw (7) it not screwed in.
The control bore (Y) is opened by the deactivated downstream solenoid
valve.
Building-up of pressure is not possible in the spring space behind the
orifice plate (6).
The circulation valve spool (5) is controlled against the spring by the flow
and opens the connection from P to T.
Control position A consumer is activated.
The working pressure builds up backwards against the pump. This
pressure also acts in the spring space of circulation valve spool (5) via
control bore (Y).
The spring moves the circulation valve spool (5) back so that only the
residual flow can return to T.
When the working pressure exceeds 200 bar (set value of pressure relief
valve), the pressure relief valve (8) opens.
The control oil now flows to the return line via the pressure relief valve
(8).
The circulation valve spool (5) is moved back so that the residual flow
can return to T without the pressure available at the consumer will
collapse.
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