VALVE ARRANGEMENT FOR CONTROLLING A FIRST AND SECOND HYDRAULICALLY ACTUATABLE DISTRIBUTING VALVE |
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| 申请号 | PCT/EP2000/005986 | 申请日 | 2000-06-28 | 公开(公告)号 | WO01004498A1 | 公开(公告)日 | 2001-01-18 |
| 申请人 | 发明人 | ||||||
| 摘要 | The invention relates to a valve arrangement which is used to control a first and second hydraulically actuatable distributing valve (10,11) whereby each of said distributing valves can be proportionally displaced in a first direction from a neutral position under the effect of a control pressure which is exerted in a first control chamber (15,16) and also in a second direction under the effect of a control pressure which is exerted in a second control chamber (17,18). The valve arrangement comprises a proportionally displaceable control pressure valve (25) having a control output (30), whereby a control pressure can be adjusted to varying degrees. Said valve arrangement also comprises a pilot valve arrangement (35), whereby the first control chamber (15) of the first distributing valve (10) can be connected in a first control state to the control output of the control pressure valve and the pressure which is exerted in the first control chamber (16) of the second distributing valve (11) can be discharged. In a second control state, the first control chamber of the first distributing valve can be connected to the control output of the control pressure valve and the pressure exerted in the first control chamber of the first distributing valve can be discharged. Control of the distributing valves should be technically simple and inexpensive. This is achieved by mounting a second control valve arrangement (37), whereby in a first control state the second control chambers of both distributing valves are jointly connected to the control output of the control pressure valve; in a second control state the pressure which is exerted in the second control chambers of both distributing valves is simultaneously discharged. In order to displace a distributing valve in a second direction, the second set of control valves is placed in a first control state and the pressure exerted in the first control chamber of the distributing valve which is to be displaced is discharged while the first control chamber of the distributing valve which is not to be displaced is impinged upon by a control pressure. | ||||||
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