Patent ID: 7174912

Claim:
A shut-off valve assembly for regulating the flow of fluid through or from a fluid line, said assembly comprising: a body attachable to or within a fluid line and having at least one chamber therein with at least one inlet and one outlet for fluid from the fluid line; a valve seat that provides the outlet; a baffle arrangement comprising a baffle housing located within the chamber; a valve member having a sealing member movable between a shielded position, whereby the sealing member seals an interior of the baffle housing in a fluid tight manner and is substantially shielded by the baffle housing from a fluid stream moving from said inlet to said outlet and in which position the sealing member is not movable by the fluid stream against the valve seat, and an unshielded position whereby the sealing member does not seal the interior of the baffle housing and is movable by the fluid stream against the valve seat to seal the outlet; and a drive for moving the sealing member between the shielded and unshielded positions.