초록 ▼

A valve includes a housing having an inlet and an outlet for the flow of a first fluid therethrough. A cup-shaped cover dome is attached to the housing. The cover dome has a cylindrical bore. A valve stem has a plug to regulate the flow of the first fluid through the housing. A piston is connected t

A valve includes a housing having an inlet and an outlet for the flow of a first fluid therethrough. A cup-shaped cover dome is attached to the housing. The cover dome has a cylindrical bore. A valve stem has a plug to regulate the flow of the first fluid through the housing. A piston is connected to the valve stem. The piston is reciprocatably received within the cylindrical bore of the cover dome to define a first chamber disposed between the piston and the housing and a second chamber disposed between the piston and the cover dome. The piston has a sliding circumferential surface received in an inner surface of the cylindrical bore. The sliding circumferential surface is adapted to fuse with the inner surface of the bore at a predetermined fused temperature, so that the piston fuses with respect to the cylinder along the sliding circumferential surface thereby effectively creating a gas-tight permanent closure between the first chamber and the second chamber, thereby preventing the first fluid from escaping from the first chamber into the second chamber.

대표청구항 ▼

A valve comprising: a housing having an inlet and an outlet for the flow of a first fluid therethrough; a cup-shaped cover dome attached to said housing, said cover dome having a cylindrical bore; a valve stem having a plug to regulate the flow of said first fluid through said housing; a piston conn

A valve comprising: a housing having an inlet and an outlet for the flow of a first fluid therethrough; a cup-shaped cover dome attached to said housing, said cover dome having a cylindrical bore; a valve stem having a plug to regulate the flow of said first fluid through said housing; a piston connected to said valve stem, said piston being reciprocatably received within said cylindrical bore of said cover dome to define a first chamber disposed between said piston and said housing and a second chamber disposed between said piston and said cover dome, said piston having a sliding circumferential surface received in an inner surface of said cylindrical bore, wherein said sliding circumferential surface is made of a material that is adapted to fuse with said inner surface of said bore at a predetermined fused temperature, so that said piston fuses with respect to said cylinder along said sliding circumferential surface thereby effectively creating a fluid-tight permanent closure between said first chamber and said second chamber, thereby preventing said first fluid from escaping from said first chamber into said second chamber.