MACHINES AND
ACCESSORIES
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9.4 Pressing work with pneumatic energy
It is also possible to operate the press using pneumatic energy supplied by an external source
(compressor, centralised circuit, etc.) to put the hydraulic circuit under pressure alternatively
to the motion of manual pumping. To take advantage of this type of supply, connect the quick
coupling of the compressed air pipe, then press the control lever of the valve to activate the
pump and put the hydraulic oil under pressure.
Figure 17 – Pneumatic pump and control valve.
9.5 Pressure release
Use the "release valve" on the pump to release the pressure of the hydraulic circuit, and
actuate the upstroke of the plunger.
Specifically, unscrew the valve knob in an anticlockwise direction.
Figure 18 - Release valve.
At the end of the upward stroke, re-tighten the knob of the "release valve" completely.
Re-tighten the release valve
Always re-tighten the release valve before starting a new pressing operation; otherwise the
piston will not work despite the pumping motion.
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