PERFEZIONAMENTO NEI SISTEMI IDRAULICI CON POMPA A PORTATA VARIABILE

摘要

A compensated multifunction hydraulic system for use with a source of hydraulic fluid includes two system valve means connected with each other and each capable of performing a separate function. One of the system valves includes a pressure compensator communicating with a control valve. A first signal line upstream of said control valve moves a spool member in the pressure compensator to enable the fluid to flow to the other system valve. A second signal line downstream of the control valve moves the spool member to deliver the necessary amount of hydraulic fluid to the control valve in accordance with the full needs thereof. Means are provided in the second signal line for diverting flow in the second signal line towards the spool member in the pressure compensator to enable the hydraulic fluid to flow to the other of the system valves when the control valve is in a stalled condition.