Pressure intensifiers, airoil actuators, flow control valves and hydropneumatic cylinders offer a maximum of movement sequences. The HPE hydropneumatic feed unit sets special standards as an integrated, individually controllable and regulatable drive element for tool and packaging machines and in process and handling engineering.
The pressure intensifier type HPU is used as a linking element in hydropneumatic actuators between the compressed air and the hydraulic cylinder. Such open-circuit hydropneumatic systems normally comprise – viewed in the direction of energy transfer – the pressure intensifier, the flow control valve (or control block comprising several such valves) and the actuating cylinder. The energy of the compressed air is transferred from the upstream pneumatic circuit to the hydraulic system. Modern electrical signal processing systems determine on the one hand the sequences in the pneumatic section with simple EP-converters. The qualitative motion sequence in the hydraulic system can also be influenced by the fact that EP-converters and the previously described, pneumatically adjustable hydropneumatic flow control valves can be used to apply signals to the hydraulic flow. Hydraulic flows in such hydropneumatic systems are very suitable for solving a number of actuation problems. The compressed air energy is quickly available due to the high flow speeds and is transferred to the hydraulic section with very little loss due to the use of the latest equipment. The hydraulic flow is free from periodical spurious oscillation, and in conjunction with the pressure intensifier described here is also free from non-periodical spurious oscillation. This very disturbing type of oscillation is often caused by trapped, non-dissolved air and unsuitable seal combinations combined with a degreased hydraulic pressure medium.
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