Expansible chamber devices – With means to control flow of non-working arresting fluid... – Flow control means positioned between chambers having a...
Patent
1973-12-06
1976-11-16
Cohen, Irwin C.
Expansible chamber devices
With means to control flow of non-working arresting fluid...
Flow control means positioned between chambers having a...
137517, 188280, 188282, 188316, 188317, F15B 1522
Patent
active
039916596
ABSTRACT:
To prevent rapid collapse of a hydraulic lift mechanism in event of the failure of the hydraulic mechanism (e.g. as by rupture of a pressurized hydraulic line) a rate of flow responsive check valve is provided, either in a separate backup cylinder or at the inlet-outlet port of the lift cylinder, to close off the return flow path of the hydraulic line in the event of sudden depressurization of the hydraulic feed line or other pressure failure in the hydraulic liquid. In normal operation, the check valve does not oppose the return flow since the rate of such flow is insufficient to activate the valve.
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