Snuffback valve for hot melt adhesive

A snuffback valve assembly (110) comprising a snuffback valve element (142) having a tapered frusto-conically disposed downstream end portion (210) for moving aerodynamically with respect to highly-viscous materials so as to effectively eliminate the phenomenon of bursting upon movement of the snuff...

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Bibliographische Detailangaben
Hauptverfasser:	BAUER, MARK D, BOLYARD, EDWARD W., JR
Format:	Patent
Sprache:	eng ; fre ; ger
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 snuffback valve assembly (110) comprising a snuffback valve element (142) having a tapered frusto-conically disposed downstream end portion (210) for moving aerodynamically with respect to highly-viscous materials so as to effectively eliminate the phenomenon of bursting upon movement of the snuffback valve element from the closed to opened positions, and an upstream end portion which comprises an annular portion disposed perpendicular to the axis of the valve element, and a sharp-cornered region (206,122), for disrupting the flow parameters of the viscous material and for maintaining vacuum conditions within a valve chamber (204) so as to prevent stringing of the viscous material when the valve element (142) is moved from the opened to closed positions.