| 摘要 |
Formed in a directional control valve (11) actuated by electromagnets (46, 53) is an eccentric spool bore (12) in which a control spool (31) is guided in sliding fashion. This spool directs pressure medium via a connecting passage (27) to a load connection (66) which can be shut off by a valve member (72) of a non-return valve (71). The valve member (72) is arranged in a longitudinal bore (28). A control spool (79) which can be pressurised by pressure medium flowing in via the connection passage (26) acts on the said valve member. The control spool (79) on the one hand acts on the valve member (72) and lifts this from the valve seat (76) and on the other hand it simultaneously opens a connection, via a passage (91), to the tank (23). As a result, the pressure medium can flow off via the connection passage (27), via which it also flows in, and via the passage (91) to the tank (23), i.e. there are now two return flow paths. This reduces the actuating forces on the control spool (31) and smaller electromagnets (46, 53) can be used. The passage (91) is designed in such a way that the majority of the pressure medium flows off via this passage.
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