LOW EFFORT, PROPORTIONAL CONTROL VALVE

A fluid control circuit for regulating fluid flow between a pressurized fluid source and a hydraulic motor, including a control valve having a movable spool for communicating fluid entering an inlet chamber from the source with service chambers in communication with the motor, a dump valve limiting...

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Bibliographische Detailangaben
Hauptverfasser:	KROTH N,US, LOHBAUER K,US, SCHEIDT J,US
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DREDGING FIXED CONSTRUCTIONS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FOUNDATIONS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HYDRAULIC ENGINEERING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SOIL SHIFTING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS WEAPONS
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Beschreibung
Zusammenfassung:	A fluid control circuit for regulating fluid flow between a pressurized fluid source and a hydraulic motor, including a control valve having a movable spool for communicating fluid entering an inlet chamber from the source with service chambers in communication with the motor, a dump valve limiting communication of the inlet chamber with a drain in response to spring means and fluid communicated to the dump valve through a passage open to either of the service chambers when it is placed in communication with the inlet chamber by the control valve spool, the passage otherwise communicating the dump valve with a drain so that fluid communication between the inlet chamber and drain is limited only by the spring means. The force of the spring means may also be varied in certain embodiments of the invention. During operation of a second hydraulic motor by an additional control valve in communication with the inlet chamber, the dump valve is conditioned to provide pressure modulation in the inlet chamber by means of a bypass valve responsive to the additional control valve.