Abstract: A valve gate for sealing the inlet from the outlet of a block and bleed type valve consists of two independent disk-like members which are interconnected by a slide mechanism allowing the disk-like members to be moved simultaneously forwardly in a first configuration, to be moved simultaneously rearwardly in a second configuration and to float and, in a specially preferred embodiment, to pivot with respect to each other between the first and second configurations so as to facilitate release of the disk-like members from the valve seat on withdrawal. An upper disk-like member to seal the inlet and a lower disk-like member to seal the outlet are connected by one or more members engaging mounting frames fixed thereto. One of the mounting frames is connected to the valve stem for horizontal movement of one of the disk-like members into and out of substantial registration with either the inlet or the outlet in response to operation of the valve stem.