Patent ID: 8939432
Filing Date: 2015-01-27
Classification: F16K

Abstract:
1. A dual disc gate valve, comprising: a valve body defining a flow path therethrough; a valve stem moveable transversely with respect to said flow path, said valve stem being mounted for axial movement in line with an axis of said valve stem; a first disc slidingly connected with respect to said valve stem on a first side of said valve stem, said first disc being slidable at a first angle with respect to said axis of said valve stem; a second disc slidingly connected with respect to said valve stem on a second side of said valve stem, said second disc being slidable at a second angle with respect to said axis of said valve stem; whereby said valve stem is operable for moving said first disc and said second disc into and out of said flow path to an open position and a closed position of said dual disc gate valve; at least one stop surface positioned to stop movement of said first disc and said second disc with said axial movement of said valve stem towards said closed position; a first sealing assembly positioned on a first side of said flow path with respect to said valve stem; a second sealing assembly positioned on a second side of said flow path with respect to said valve stem; at least one spring positioned to apply a force to said first disc and said second disc wherein said at least one spring is positioned to urge said first disc and said second disc in a direction toward said at least one stop surface, said at least one spring being mounted at an angle with respect to said axis of said valve stem; whereby continued movement of said valve stem urges said first disc and said second disc to an expanded position so that said first disc engages with said first sealing assembly and said second disc engages with said second sealing assembly, and whereby said axial movement of said valve stem away from said flow path urges said first disc and said second disc to a contracted position to disengage said first disc from said first sealing assembly and said second disc to disengage from said second sealing assembly.