Patent ID: 8616240
Filing Date: 2013-12-31
Classification: B41J,F16K,Y10T

Abstract:
1. A backflow prevention valve comprising: a port; a valve plug that is disposed covering the port, closes the port when fluid flows in one direction, and opens the port when fluid flows in the opposite direction; and a valve plug seating surface in which the port is formed; wherein the port is formed in the valve plug seating surface at a position eccentric to the center of a seal area of the valve plug; a fluid conduction channel is formed in the valve plug seating surface extending from a position where the port is formed to a position on the opposite side of the seal area center; the valve plug has a stem affixed in a support orifice formed in the center of the seal area in the valve plug seating surface, and a disc that is formed on one end of the stem and opposes the valve plug seating surface; the port is formed at a position circumferentially eccentric to the center of the support orifice; and the fluid conduction channel extends from one edge of the port circumferentially around the center of the support orifice to a position that is the opposite side of the port.