Valve for viscous fluid applicator

A valve (10) for dispensing a viscous fluid, includes a valve body (12) defining a fluid chamber (34) and a stepped armature (16) within the fluid chamber (34). The armature (16) has a large diameter portion maintained spaced apart from an inner surface of the valve body, defining a first air gap (1...

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Bibliographische Detailangaben
Hauptverfasser:	THOMAS J STOBBS, JAMES R WARD
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL ATOMISING APPARATUS BLASTING COCKS DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING NOZZLES PERFORMING OPERATIONS SPRAYING APPARATUS SPRAYING OR ATOMISING IN GENERAL TAPS THERMAL INSULATION IN GENERAL TRANSPORTING VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A valve (10) for dispensing a viscous fluid, includes a valve body (12) defining a fluid chamber (34) and a stepped armature (16) within the fluid chamber (34). The armature (16) has a large diameter portion maintained spaced apart from an inner surface of the valve body, defining a first air gap (130) therebetween, and a second, smaller diameter portion which engages an inner surface of the valve body, supporting the armature within the valve body and defining a second lower reluctance air gap (134). A solenoid coil (20) energized by a peak and hold drive current produces an electromagnetic field for moving the armature relative to the magnetic pole piece and the valve body. The second portion of the armature becomes magnetically saturated during the peak portion of the drive current, causing magnetic flux to be diverted through the first portion of the armature. The second portion of the armature comes out of saturation during the hold portion of the drive current, allowing a portion of the magnetic flux to be passed through the lower reluctance air gap.