| 摘要 |
1. A priority valve (10, 10', 110, 110') having ports (34, 36, 62, 134, 135, 136) for a pressure source (12, 112) and primary and secondary loads (14, 114 and 16, 116), a spool (38, 38', 138, 138') and a spring (58, 162), wherein the spool (38, 38', 138, 138') is urged into a position of interrupting the communication between the pressure source (12, 112) and the secondary load (16, 116) as a result of being acted upon by the spring (58, 162) and the operating pressure of the primary load (14, 114) at one end, against a control force acting on the spool (38) at the other end, in particular produced by the spool (38) being acted upon at the other end by the pressure of the pressure source (12), characterised in that in dependence on the operating pressure obtaining at the primary load (14, 114) and as soon as same is exceeded by a predetermined value, the effect of the spring (58, 162) can be removed and the spool (38, 38', 138, 138') is movable into a position providing a communication between the pressure source (12, 112) and the secondary load (16, 116). |
