Hydraulic line coupling arrangement

摘要

The branch of the hydraulic circuit, contains an inlet from the pump (9) and a return to tank (10) and in the pressure line (9) a security valve (11) whose spool (12) is normally open when there is pressure in the line (9). A control valve (20) bleeds off the pressure in the line (17) feeding the other side of the control valve via the restrictor (16) being normally open (19). When there is a build up of pressure in the return (10), the control valve (20) closes and the build up in pressure in line (17) closes the safety valve.