I-6
35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
4. FUNCTIONING OF FLOW CONTROL VALVE
The Control Valve has three distinct functioning
phases:
A) NEUTRAL PHASE
B) DELIVERY PHASE
C) DISCHARGE PHASE
A. NEUTRAL PHASE
In this phase the control valve keeps under
pressure the oil in the cylinder bearing the load
while the oil coming from the pump flows freely
into the tank.
The control spool (1) is in the position to connect
chamber (26) of the pilot valve (27) directly to
the discharge through hole (16). Thus allowing
the same valve to open hole (28) which
discharges chamber (15) by means of the duct
(29) of the regulator piston (2). Thus the oil
coming from the pump feeds chamber (22) and
allows the regulator piston (2) to open the holes
(17) and the oil flows to the tank.
The oil contained in the cylinder (23) remains
under pressure by means of the check valve (3),
by the discharge valve (4) and by the safety valve
(5) which are connected to the cylinder by the
annular duct (18) and thus sustains the load
applied to the lifting arms.
The safety valve (5) protects the cylinder from
the possibility of eventual over-pressure due to
the oscillation of the load during road transport.
Hydraulics
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