초록 ▼

A jerrycan holds liquid fuel. A cap for the jerrycan includes an air vent valve assembly having an umbrella-shaped check valve. The check valve is sensitive to a pressure differential between an interior of the jerrycan and the atmosphere. As fuel is dispensed from the jerrycan, a volume of an air c

A jerrycan holds liquid fuel. A cap for the jerrycan includes an air vent valve assembly having an umbrella-shaped check valve. The check valve is sensitive to a pressure differential between an interior of the jerrycan and the atmosphere. As fuel is dispensed from the jerrycan, a volume of an air chamber within the jerrycan increases, thereby decreasing the pressure in the jerrycan and creating a vacuum. The vacuum causes the rate at which fuel is dispensed from the jerrycan to decrease. The check valve dislodges when the pressure within the jerrycan becomes less than the pressure of the atmosphere and additional air is introduced into the jerrycan. The air fills the expanded volume of the air chamber, thereby increasing the pressure, eliminating the vacuum and causing the rate at which fuel is dispensed to increase.

대표청구항 ▼

[ Having thus described the preferred embodiments, the invention is now claimed to be:] [1.] A tank vent valve assembly, comprising:a tank;a cap mounted on the tank;an outlet passage through the cap;an inlet passage through the cap, spaced from said outlet passage, the inlet passage having a first e

[ Having thus described the preferred embodiments, the invention is now claimed to be:] [1.] A tank vent valve assembly, comprising:a tank;a cap mounted on the tank;an outlet passage through the cap;an inlet passage through the cap, spaced from said outlet passage, the inlet passage having a first end and a second end;a first housing mounted in the first end of the inlet passage of the cap, the first housing having a first end and a second end;a first air passage extending through the first housing and having a first end and a second end, the first end of the first air passage communicating with an exterior of the first end of the first housing and the second end of the first air passage communicating with an exterior of the second end of the first housing;a second housing mounted in the second end of the inlet passage of the cap, the second housing having a first end and a second end and having a recessed area at the second end;a second air passage extending in the second housing and having a first end and a second end, the first end of the second air passage communicating with an exterior of the first end of the second housing and the second end of the second air passage communicating with an exterior of the second end of the second housing, the first end of the second air passage communicating with the second end of the first air passage; and,an umbrella-shaped check valve mounted in the recessed area of said second housing, the check-valve comprising a centrally located stem and a hood secured to the stem, the hood having a first face and a second face, the first face of the check valve hood sealing against the second end of the second air passage when a pressure on the first face is not greater than a pressure on the second face, and the first face of the check valve hood not sealing against the second end of the second air passage when the pressure on the first face is greater than the pressure on the second face, the check valve being made of an elastomeric material to allow a flexure of a radially outer portion of the hood in relation to a central portion of the hood adjacent the stem.