Patent ID: 7530368

Claim:
A valve device for separating hostile media, comprising: a housing which has connection pieces each having a specific first opening cross section, for at least two pipelines which can communicate with one another in said housing via a connecting orifice of a specific second opening cross section; a valve arrangement for selectively closing and releasing said connecting orifice, said valve arrangement having a first valve seat, and a first valve disk, said first valve disk having a sealing face cooperating with said first valve seat, a middle connecting portion which is connected to a valve stem, and a tubular extension which serves for an outflow of a medium, and a drainage portion arranged between said sealing face and said connecting portion, said drainage portion having a plurality of spokes extending between said sealing face and said connecting portion and separating a plurality of drainage orifices, wherein said plurality of spokes extend obliquely with respect to a plane spanned by said sealing face of said first valve disk, in such a way that an overall third opening cross section of said plurality of drainage orifices amounts at least essentially to or is larger than at least one of said second opening cross section of said connecting orifice, or said first opening cross section of at least one of said connection pieces, said valve arrangement having a second valve seat and a second valve disk, said second valve seat and said first valve seat being formed at said connecting orifice, said second valve disk being arranged above said first valve disk and has no drainage orifice.