Eaton Fluid Power Gmbh

Michael Zimpfer

Andreas Richard Hilgert

Ralph Peter Merkel

The inventive sliding valve () comprises a slide (), which is mounted in a manner that enables it to move transversal to the passage channel (). This valve is provided with an asymmetrical design whereby enabling the pressure prevailing in the passage channel () to reach a side of the slide () via suitable ducts (), whereas the other side is not subjected to any pressure or only to a constant low pressure. A pressure spring () works counter to the pressure and holds the slide () in the open position. In the event the fluid pressure prevails, the slide () is displaced into the blocking position in which it remains until the pressure falls below the switching limit once again.

Pressure-dependent check valve and hydraulic system equipped therewith

Hydraulic systems generally comprise expansion hose lines and other damping elements which are provided with one or several serially connected hose chambers according to the generated pressure pulsation. The damping measures of the inventive hydraulic system are initiated according to the prevailing pressure during operation thereof. The aim of the invention is to keep the loss of pressure low and save a significant amount of energy during continuous operations. Said aim is achieved by a direct line connection between the source of pressure and the user, which bypasses the dampers. Said bypass line is blocked by a valve when the pressure in the system increases.

Hydraulic system comprising pressure-controlled damping means

Disclosed is a damping device to be incorporated into fluid systems, particularly hydraulic systems, said damping device comprising an expansion hose. An essentially rigid damper which is oriented counter to the direction of flow, is disposed inside the internal space of said expansion hose. The damper pipe is provided with a completely closed wall, resulting in a good damping effect. Preferably, the damper pipe is significantly less flexible in the radial direction than the outer expansion pipe, whereby the damping effect is substantially enhanced.

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Ettlingen, Germany

Michael Zimpfer