Motors: expansible chamber type – With motive fluid valve – Both inlet and exhaust controlled by motive fluid pressure...
Patent
1990-10-16
1992-03-17
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Both inlet and exhaust controlled by motive fluid pressure...
91461, 13762506, F15B 1110
Patent
active
050958062
ABSTRACT:
Device in a hydraulic power system connected to load driving hydraulic motor (18; 32), comprising a pilot controlled flow regulating directional valve (1; 29) for alternative connection of the service ports of the motor (18; 32) to a pressure medium source and a tank. The directional valve (1; 29) comprises two opposite and by a pilot pressure activatable activating means (3, 4), and a pilot pressure means (84) is arranged to pressurize and activate the activating means (3, 4), alternatively, and drain one of the activating means to the tank through a flow restriction (6, 7) at activation of the other activating means (3, 4). The power system comprises at least one control flow circuit (10-12; 72-83; 37-44) which communicates with one of the activating means (3, 4), and a valve means (11, 12; 71; 31) which is arranged to accomplish a flow through the control flow circuit (10-12; 72-83; 37-44) in relation to the load pressure on the motor such that the counter pressure from the flow restriction (5, 7) generates a compensating force in relation to the load pressure on the motor on the non-activated activating means (3, 4).
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Nilstam Bo
Valdemar Orjan E.
Atlas Copco Aktiebolag
Denion Thomas
Look Edward K.
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