SECTION III USE
Nomenclature
Directional control valve:
A valve that can be operated to control the flow of oil from a pressurised
circuit to an outlet port. There are three main types of directional control
valve: SINGLE-ACTING (no longer used), DOUBLE-ACTING and
DOUBLE/SINGLE-ACTING.
Double-acting control valve:
When the control lever is moved in one
direction, the control valve spool shifts to
allow pressurised oil to flow out through one
port and return through a second port. When
the control lever is moved in the opposite
direction, the direction of flow is reversed.
The control lever has 3 positions: pressure
port 1, neutral 0, pressure port 2.
Double/single-acting control valve:
This valve is like the double-acting valve described above, but can be
converted into a single-acting valve by way of a screw. When operating in
single-acting mode, the valve is connected to the implement by a single
hose connected to the pressure port 1; this hose serves as both the
pressure and return line (when the control lever is in the “return” position).
The control lever still has 3 positions: pressure 1, neutral 0 and return.
Double/ single acting
Conversion to single-acting -
Turn the screw A to one port of
the control valve which is
permanently connected to the
tank return line, so that the
other port may be used for both
pressure and return.
54
Abbassamento
Neutro
Sollevamento
102
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