Pilot-operated valve with load pressure feedback
Patent 4741364 Issued on May 3, 1988. Estimated Expiration Date: 
June 12, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 12, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3384102 Load responsive fluid control valve Control valve Hydraulic pressure reducing control valve Patent #: 4576200 InventorsAssigneeApplicationNo. 07/060880 filed on 06/12/1987US Classes:137/625.64, Electric137/625.6Pilot-actuatedExaminersPrimary: Michalsky, Gerald A.International ClassesG05D 16/20 (20060101)F15B 13/04 (20060101) F15B 13/00 (20060101) F15B 13/042 (20060101) AbstractA pilot-operated electrohydraulic valve has a pilot valve member exposed to load pressure via a load pressure feedback passage. Part of the pilot valve member forms a feedback valve which closes communication through the feedback passage upon a predetermined movement of the pilot valve so that the pilot valve can be fully opened without having to overcome the load pressure which would otherwise act on the pilot valve.Other References
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