FLOW RESPONSIVE LATCH FOR HOLDING A SPOOL VALVE IN AN OPEN POSITION

A valve includes a body with a spool bore, a supply passage, a tank passage, and a workport. A spool, in the spool bore, has a first position providing a first path between the supply passage and the workport, a second position providing a second path between the tank passage and the workport, and a...

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Bibliographische Detailangaben
1. Verfasser:	PIEPER GARY J
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DEVICES FOR VENTING OR AERATING DREDGING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FOUNDATIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS 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 TAPS 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 THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A valve includes a body with a spool bore, a supply passage, a tank passage, and a workport. A spool, in the spool bore, has a first position providing a first path between the supply passage and the workport, a second position providing a second path between the tank passage and the workport, and a closed position. A latch assembly includes a cam that moves in response to pressure, a sphere engaged by the cam, and a notch. While the spool is in the second position, fluid flowing from the workport to the tank passage produces a first pressure, which causes the cam to hold the sphere in the notch, thereby inhibiting spool movement; and when the fluid flow from the workport to the tank passage terminates, a second pressure is produced causing the cam allow the sphere to move out of the notch, thereby enabling the spool movement.