Backflow prevention valve
AssigneeNifco Inc.
InventorHideaki Takahashi
Life of this patent
Estimating the term…
Abstract
A backflow prevention valve includes a cylindrical case member with an inflow opening at one end and an outlet at the other end or a peripheral surface or both, and a valve member contacting a peripheral edge of the inflow opening for closing the inflow opening. An urging device urges the valve member toward the inflow opening, and a liquid inflow pipe is connected to the inflow opening from outside the case member. The liquid inflow pipe has a smooth inner surface without unevenness, and is attached to a fuel supply pipe inside the fuel tank. When the fuel is supplied, the valve member moves against an urging force of the urging device due to a fuel pressure, so that the inflow opening opens.
Claims7
A backflow prevention valve attached to a fuel supply pipe for preventing a backflow of fuel, comprising:
- a cylindrical case member having a peripheral wall, an inflow opening formed at one end, and an outlet formed in at least one of the other end and the peripheral wall,
- a valve member disposed in the case member to be movable in an axial direction thereof and having a sealing portion at an upper surface thereof for contacting a peripheral edge of the inflow opening to close the same,
- an urging device disposed in the case member for urging the valve member toward the inflow opening, and
- a liquid inflow pipe extending outwardly from the case member around the inflow opening and having a smooth inner surface to allow the fuel to smoothly flow through the backflow prevention valve.
Dependencies are inferred from the claim text.