Title: Load responsive fluid control valves

Abstract: A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve. When controlling positive or negative loads the valve maintains a constant pressure differential across a flow control metering orifice utilizing a single control slide member, first by throttling fluid entering the inlet chamber and then by throttling the fluid leaving the outlet chamber. The valve may be used with fixed displacement pumps, fixed displacement pumps equipped with differential pressure relief valves, with variable pumps equipped with pressure compensators and variable pumps equipped with differential pressure compensators.

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Inventors: Budzich, Tadeusz (Moreland Hills, OH, US)

Application Number: 717759
Filing Date: 1976-08-25
Publication_date: 1978-05-16
Assignee:
Primary Class(es): 60/427 91/446, 91/451, 137/596.12
Other Classes:
US Patent Ref:

3285282	Nov, 1966	Martin	137/504.
3730219	May, 1973	Tennis	137/596.
3807443	Apr, 1974	Jacobs	137/501.
3807447	Apr, 1974	Masuda	137/596.

Other Refs:
Primary Examiner: Schwadron, Martin P.
Assistant Examiner: Hershkovitz, Abraham
Attorney: Hogg; William N.