Double-seat valve

Details Double-seat valve Double-seat valve

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 1/44 (2006.01)

Patent

CA 2258738

The invention relates to a double-seated valve for use especially in aseptic applications, comprising at least two pipe connectors (3, 4, 7) between which two annular valve seats (11, 12) are positioned coaxially in relation to each other and in series. Said double-seated valve also comprises two closing elements (8, 9) which can be axially displaced independently of each other and when closed cooperate with the valve seats (11, 12) in a sealing manner and enclose a hollow chamber (34) between each other, as well as at least one cleaning connector (35, 36) leading into said hollow chamber (34) for introducing a cleaning medium. To avoid the disadvantages of a non-aerodynamic leakage chamber the invention provides for the two end sections (22, 23) of an elastic sealing element (21) embodied as a ring-shaped single piece to be attached in a sealing manner to the two closing elements (8, 9). A sealing surface (25, 26) is embodied adjoining to each end section (22, 23), which sealing surface can be pressed against the corresponding valve seat (11, 12) by means of a closing element (8, 9). The sealing element (21) has a section of rolling diaphragm (24) which connects the two end sections (22, 23) to each other and defines the hollow chamber (34).

L'invention concerne une soupape à siège double, s'utilisant notamment à des fins d'asepsie, qui comprend au moins deux raccords de conduite (3, 4, 7) entre lesquels sont disposés deux sièges de soupape (11, 12) annulaires montés en série et coaxialement l'un par rapport à l'autre. Cette soupape à siège double comprend également deux éléments de fermeture (8, 9) coulissant dans le sens axial indépendamment l'un de l'autre, et qui, à l'état fermé, coopèrent de manière étanche avec les sièges de la soupape (11, 12) et délimitant une cavité (34) comprise entre eux, ainsi qu'au moins un raccord de nettoyage (35, 36) débouchant dans la cavité (34) et destiné à introduire une substance nettoyante. Afin d'éviter les inconvénients inhérents à une cavité de fuite non aérodynamique, il est prévu selon l'invention un élément d'étanchéité (21) élastique monobloc annulaire, fixé de manière étanche sur les deux éléments de fermeture (8, 9), par ses deux sections terminales, une surface d'étanchéité (25, 26) adjacente à chaque section terminale (22, 23) étant formée et pouvant être comprimée par un élément de fermeture (8, 9) sur le siège de soupape (11, 12) correspondant. L'élément d'étanchéité (21) comporte une section membranaire périphérique (24) qui relie les deux sections terminales (22, 23) et délimite la cavité (34).

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