Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1982-08-25
1984-10-23
Schwadron, Martin P.
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
1374875, 251 30, F16K 3700, F16K 3140
Patent
active
044782454
ABSTRACT:
An electrically controllable valve assembly for hydraulic adjustment of a piston includes a pilot valve controllable by an electronic controller. The pilot valve has a spool and a restrictor array comprising first and second variable restrictor means and a fixed restrictor means, through which flows an auxiliary bleedflow of hydraulic fluid. The variable restrictor means are adjusted in opposite directions in order to produce from the bleed flow a control pressure which is responsible for positioning of the piston of the valve assembly. A pressure drop is taken off at the fixed restrictor means, and acts on the spool to produce a negative feedback action, thereby always to produce a given displacement control flow, irrespective of the system pressure, while avoiding control oscillations.
REFERENCES:
patent: 3024801 (1962-03-01), Carls
patent: 4219181 (1980-08-01), Joelson
patent: 4340086 (1982-07-01), Hemm et al.
Rivell John A.
Schwadron Martin P.
Vickers Incorporated
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