Hydraulic control for spool valve unit - makes use of throttles to reinforce spring action

摘要

The hydraulic control arrangement has a directional control valve in which the control chamber (60) is connected by a channel (77) with a first throttle point (63) between the stop (14) and the pressure balance (12). A second throttle point (75) is arranged in the channel (74) so that both throttle points control an intermediate flow in the chamber (60) which backs up the force exerted by the control spring (61). USE/ADVANTAGE - Hydraulic control unit of compact design which requires a very small spring cavity.