Patent ID: 6254835
Filing Date: 2001-07-03
Classification: B01J,B01L,C40B,G01N,Y10T

Abstract:
A bi-directional check valve and U-valve apparatus adapted for connection to a discharge port of a vessel, for controlling liquid flow from a vessel through the U-valve, the bi-directional check valve comprising:a first channel;a first valve within the first channel, the first valve being adapted to be in one of an open position or a closed position, the valve being adapted to block liquid flow in a direction from the vessel through the discharge port and through the U-valve when in the closed position, the valve being adapted to admit a fluid traveling in a direction from the U-valve through the discharge port and into the vessel when in the open position;a second channel; anda second valve within the second channel, the second valve being adapted to be in one of an open position or a closed position, the valve being adapted to block liquid flow in the direction from the vessel through the discharge port and through the U-valve when in the closed position, the valve being adapted to allow liquid flow in the direction from the vessel through the discharge port and through the U-valve when in the open position.