Motors: expansible chamber type – With motive fluid valve – Both inlet and exhaust controlled by motive fluid pressure...
Patent
1975-12-17
1978-01-03
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Both inlet and exhaust controlled by motive fluid pressure...
91445, 91447, F15B 13043
Patent
active
040660060
ABSTRACT:
A main valve controls the flow to a load in a first or second direction depending upon the signal applied to a pilot valve. A spool of the main valve is biased to a central position blocking flow by springs. A throttle valve having an adjustable restrictor area is connected in one line between the main valve and the load. The restrictor area is adjusted in correspondence to an input signal. The spool is moved to a first or second extreme position by the pilot valve. The pressure difference developed across the throttle valve is applied to the spool in a direction to force the spool towards the central position. The spool is balanced at a predetermined pressure difference across the throttle valve. A relief valve is furnished in an inlet line to the main valve so that a reversal of pressure medium flow through the load causes an excess pressure difference across the throttle valve and thereby moves the main valve spool to the other of its two operating positions in turn causing a substantial pressure increase in the inlet line causes operation of the relief valve and thereby braking of the load.
REFERENCES:
patent: RE24002 (1955-05-01), Beck
patent: 2644482 (1953-07-01), McCallum
patent: 2976848 (1961-03-01), Place
patent: 3038498 (1962-06-01), Spavey
patent: 3095906 (1963-07-01), Kolm, Jr.
patent: 3126031 (1964-03-01), Hayner
patent: 3213886 (1965-10-01), Pearne
patent: 3230841 (1966-01-01), York
patent: 3375659 (1968-04-01), Ray
patent: 3763746 (1973-10-01), Walters
patent: 3799200 (1974-03-01), Tipton
patent: 3859791 (1975-01-01), Allen et al.
patent: 3865014 (1975-02-01), Van der Kolk
Cohen Irwin C.
Robert Bosch G.m.b.H.
Striker Michael J.
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