Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1975-06-05
1977-10-04
Cohen, Irwin C.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Second path activated in response to pressure or flow in...
91420, 91451, 137106, 137110, F15B 13042
Patent
active
040517640
ABSTRACT:
In order to automatically switch an open circuit type hydraulic actuating circuit to the meter-in flow control system when the direction of the load is positive or to the meter-out control system when the direction of the load is negative or is reversed to negative, thereby controlling the speed of the load, there is provided a hydraulic actuating system in which an amplifier valve assembly of the type which may produce a main flow whose flow rate is amplified with respect to that of a pilot flow in proportion to the ratio of the opening area of a detector orifice inserted in a pilot flow passage to the opening area of a main orifice inserted in a main flow passage, is hydraulically and operatively combined with a meter-in flow control valve for controlling the flow rate of the pilot supply flow in the amplifier valve assembly, a meter-out flow control valve for controlling the flow rate of the pilot return flow, and a switching valve inserted between the pilot supply and return flow passages and adapted to be shifted automatically in response to the pressure difference in the pilot supply and return flow passages in such a manner that one pilot flow passage having a lower pressure than the other pilot flow passage may be communicated through a low-pressure relief valve with a tank.
REFERENCES:
patent: 3158167 (1964-11-01), Redelman et al.
Cohen Irwin C.
Jecies Saul
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