Bucher Hydraulics Spa

Hydrocontrol S.p.a. Con Unico Socio

Massimo Riva

Luca Taddia

Claudio Bulgarelli

Open centre hydraulic distributor, comprising: a free circulation line connecting a supply line from a negative control pump to a discharge; a delivery line connecting the supply line to users; at least one directional valve that intercepts the free circulation line and the delivery line, so that it narrows a transit area of the free circulation line and opens a transit area of the delivery line, and vice versa; a slide valve arranged on the free circulation line downstream of the directional valve; a valve device that is activated when a threshold value of a pressure delta between upstream and downstream of the directional valve is reached, and maintains this pressure delta equal to the threshold value; a negative control line to pick up a pressure signal from the free circulation line downstream of the directional valve and upstream of the slide valve.

Open centre hydraulic distributor and power transmission system for transmitting to users of an operating machine

An inlet section for use in a hydraulic distributor including a valve body and a slider with a first area and a second area. The inlet section further including said slider being longitudinally slidable within the valve body between a first position in which it prevents passage of fluid from a high pressure line to a low pressure line, and a second position in which it enables passage of fluid. The inlet section further including a main spring active on the second area of the slider in a direction consistent with action of the second pressure and a control device of the slider. The control device of the slider includes a mechanical actuator member selectively active on the slider in a direction consistent with the action of the first pressure on the first area of the slider so as to force the slider in the second position.

Inlet section for use in a hydraulic distributor

Hydraulic section () for use in a hydraulic distributor (), comprising: a valve body (); a main spool (); pressure compensator () housed in a first hole in the valve body (); a piston () housed in the first hole; an intermediate chamber () in fluid communication with the feed line (Pal), the intermediate chamber () extending at least partially in the first hole and being delimited by the rod () of the piston (); two limiters () and a drainage channel () pertaining to the intermediate chamber () for altering the pressure thereof and close the compensator ().

Hydraulic section for load sensing applications and multiple hydraulic distributor

Hydraulic system for actuating the hydraulic actuators of a working machine, the hydraulic system has a delivery, a discharge, a drainage line, a signal line, a main slide valve which actuates a corresponding hydraulic actuator, a safety slide valve integral with the main slide valve and adapted for opening or closing the drainage line itself, and a pressure compensator presenting a frontal chamber connectable by way of the main slide valve to the delivery and a rear chamber connected to the signal line; the drainage line connecting a node of the signal line to the discharge.

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Modena, Italy

Massimo Riva