Hydraulic actuator with hydraulic springs

Details Hydraulic actuator with hydraulic springs Hydraulic actuator with hydraulic springs

1992-03-10

1993-07-06

Rivell, John

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 47, 251 48, 251 635, 123 9012, F16K 31124

Patent

active

052246833

ABSTRACT:
Movement of a main valve between first and second stable positions is dependent upon hydraulic pressure controlled by an electrically controlled pilot valve reciprocable between first and second stable positions. When the pilot valve is in its first stable position, high pressure hydraulic fluid is admitted to a primary accumulator, while the working piston of the main valve is exposed only to low pressure, thereby maintaining the main valve in its first stable position. When the pilot valve is in its second stable position, the primary accumulator communicates with the working piston so that expanding hydraulic fluid acts ont he working piston to drive the main valve to its second stable position. A secondary accumulator communicating with the bores of said main valve and pilot valve, together with pistons or the valve stems, provide hydraulic springs urging the pilot valve and main valve toward their first stable positions.

REFERENCES:
patent: 4974495 (1990-12-01), Richeson, Jr.
patent: 5058538 (1991-10-01), Erickson et al.

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