Dosing valve having seal failure detection

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 37/00 (2006.01) B67C 3/28 (2006.01)

Patent

CA 2197756

A piston-type dosing valve (20) is set forth that provides a hermetically sealed chamber (76) behind the diaphragm (66) which separates the aseptic portion (74) of the valve (20) from the mechanical portion of the valve (20). An external vacuum source (84) is connected to an opening in the chamber (76) thereby maintaining a constant negative pressure within the chamber (76). Any breach in the diaphragm (66) will be detected by a pressure sensor (88) located within the sealed chamber (76). In one embodiment, visual inspection for the presence of liquid product in the sealed chamber (76) can be accomplished through a window (38) in the dosing valve housing (22, 24) located adjacent to the diaphragm (66) and sealed chamber (76).

La vanne (20) de dosage du type à piston décrite possède une chambre (76) scellée hermétiquement derrière le diaphragme (66) qui sépare la partie asceptique (74) de la vanne (20) de la partie mécanique de la vanne (20). Une source à vide (84) extérieure est connectée à une ouverture ménagée dans la chambre (76) ce qui permet de maintenir une pression négative constante à l'intérieur de la chambre (76). Toute rupture du diaphragme (66) est détectée par un capteur (88) de pression situé à l'intérieur de la chambre (76) scellée. Dans un mode de réalisation, une inspection visuelle de la présence de produits liquides dans la chambre (76) hermétique peut s'effectuer au travers d'une fenêtre (38) ménagée dans le corps (22, 24) de la vanne de dosage et située adjacente au diaphragme (66) et à la chambre (76) hermétique.

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