Jolly Rev.05 Ed. Sett.2010(I)
7/24
▪
Directional control valve
:
the directional control valve distributes the
pressurised oil to the services in accordance with the required
operations of lifting or lowering of the load body. The directional
control valve is composed of an open-centre spool valve, a load-
holding check valve that serves to hold the body in its raised
position, and a
pressure relief valve
that protects the various parts
of the system from possible overpressure conditions.
▪
Power unit
: in alternative to the mechanical plant above mentioned,
is actuated by a tele-control located in the cab.
▪
Piping:
suction
(from tank to pump)
;
delivery (from pump to directional control valve);
delivery/return (from directional control valve to lift
cylinder);
delivery/return (from power unit to lift cylinder).
