Patent ID: 7254945

Claim:
An operate check valve comprising: a switching valve having first and second valving regions and a central valving region located between said first and second valving regions; a first check valve movable between closed and open configurations; and a second check valve movable between closed and open configurations; wherein said switching valve is operable in a first configuration in which a first side fluid conduit of said switching valve is in fluid communication through the first valving region with a first check valve fluid conduit through the open first check valve, and a second side fluid conduit of said switching valve is in fluid communication with a central fluid conduit of said switching valve through the switching valve's central valving region; wherein said switching valve is operable in a second configuration in which the second side fluid conduit of said switching valve is in fluid communication through the second valving region with a second check valve fluid conduit through the open second check valve, and the first side fluid conduit of said switching valve is in fluid communication with the central fluid conduit of said switching valve through the switching valve's central valving region; and wherein structure on the switching valve is configured to bear on structure of the first and second check valves to urge the first and second check valves from their closed to open configurations.