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(11) | EP 2 136 085 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Hydraulic pressure intensifiers |
| (57) A hydraulic intensifier comprises a piston and cylinder assembly (1) having a first
piston (3) in a chamber (4) of low pressure cylinder and a second piston (7) in a
chamber (8) of a high pressure cylinder. The first and second pistons are coupled
together and the first piston has a larger cross-sectional area than the second piston.
A high pressure output (19) is coupled to the chamber of the high pressure cylinder,
there being: means (13) for supplying low pressure hydraulic fluid to the chamber
of the low pressure cylinder; an electrically operated directional control valve (11)
for controlling the supply of low pressure hydraulic fluid to the chamber of the low
pressure cylinder; and electronic means (14) for controlling operation of the directional
control valve.
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