| 主权项 |
1. A venting apparatus for managing flow through a fill cap base, the venting apparatus comprising:
a top assembly, the top assembly having a cap cover and a cylindrical cap body concentric with, and protruding substantially perpendicular from, an underside surface of the cap cover; a bottom assembly slidably engaged to, and concentric with, the top assembly, the bottom assembly having a vacuum valve operatively coupled with a valve body,
wherein the vacuum valve comprises a vacuum base and a vacuum stem perpendicularly positioned on said vacuum base,wherein the valve body comprises (1) a cylindrical valve body portion having a first vent hole and (2) a valve base having a second vent hole and a through hole configured to receive the vacuum stem,wherein the vacuum base and the valve base are arranged substantially concentric and parallel to one another, the vacuum base being moveable between a first position and a second position,wherein the vacuum base prevents flow through the second vent hole in the first position and permits flow through the second vent hole in the second position, the vacuum base being biased in the first position by a vacuum spring; and a pressure spring, the pressure spring residing at least partially within each of the cylindrical valve body portion and the cylindrical cap body, wherein the pressure spring is configured to impart a force that biases said bottom assembly away from said top assembly. |
