Curcuit Function - With Oil Flowing B-Port To A-Port (From Cylinder Bottom Side To Main Control Valve) - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
3. With oil flowing from B-port to A-port
(from cylinder bottom side to main control valve)
(1) When the pilot pressure is applied, the pressure in the pilot chamber (e) rises. The oil from the pilot
chamber flows along the pilot line and through the orifices (f) and (g) into the drain port. Now the air in
the pilot pipe is let out automatically.
(2) Because of the pilot pressure, the pistons (3)-1 and (3)-2 as well as the spool are activated against the
spool s return spring force. The return oil from the actuator flows from B-port (cylinder) through the spool
control (h) into A-port (main control valve).
(3)-1
(3)-2
(h)
Fig. 3 With oil flowing from B-port to A-port (at low pilot pressure)
(e)
(f)
(g)
IV-M-117
IV Hydraulic System
B port
A port
(e) Pilot chamber
(f) Orifice
(g) Orifice
(h) Control spool