Mannesmann Rexroth Corporation

Bosch Rexroth Ag

Michael Reinert

Stefan Schmidt

Rolf Kordak

Joachim Neumann

Frank Hofmann

Helmut Behl

Bruno Schneider

Karl J H Cords

Thassilo Maxeiner

Helmut Etzel

Dragoljub Djenadija

An unlockable non-return valve reduces the tendency of the poppet piston to jam by providing a first insert that has a guide diameter for the poppet piston over just a short section of its end side facing the piston collar, and wherein a supporting ring is arranged axially between the high-pressure seal and the first insert in a receiving element, the diameter of which is substantially smaller than the outside diameters of the inserts, the supporting ring likewise being produced from a metallic material having good sliding properties and being produced with a narrow clearance from the end section of the poppet piston and with a large radial clearance from the receiving element.

Unlockable non-return valve for very high system pressures

Control system for hydraulic power units

Hydraulic drive for a sheet metal forming press

For the production and exact control and regulation of very high pressures, in particular for actuating a press, two pressure intensifiers are provided which each have a differential piston. The second pressure intensifier is connected via a shutoff valve to the first pressure intensifier and to the load or consumer. Both pressure intensifiers have a small volume compared with the volume required by the consumer. By activating the second pressure intensifier fluid can be exchanged between the consumer and the first pressure intensifier to replenish the first pressure intensifer in a pressure buildup phase and to empty the first pressure intensifier in a pressure relief phase.

Controlled series high-pressure intensifiers for hydraulic press

Growing community of inventors

Lohr, Germany

Michael Reinert