초록 ▼

A vented fuel tank cap and valve assembly is described including a pressure relief valve with a main valve member mounted at a main vent opening through the fuel cap. A fusible metal ring of low melting point is provided in the pressure relief valve to enable such valve to open in the event of fire

A vented fuel tank cap and valve assembly is described including a pressure relief valve with a main valve member mounted at a main vent opening through the fuel cap. A fusible metal ring of low melting point is provided in the pressure relief valve to enable such valve to open in the event of fire to prevent an explosion. A float valve may be provided to close a secondary vent passage for venting fuel fumes through the valve stem portion of the main valve member. The float valve includes a tubular cage member attached to such valve stem portion and containing a hollow float member with a cavity opening through the bottom of such float. A metal ball is provided within the cage member beneath the float member to hold the float valve closed when the tank tips to an inverted position and to trap liquid fuel in such cavity so that such fuel flows out of the cavity to open the valve when the tank returns to an upright position to prevent the float valve from sticking closed. An auxiliary seal portion may be provided on the main valve member to increase the tank pressure required to remove the main valve member from the tank after the fusible ring melts so that liquid fuel is not discharged from the tank prematurely.

대표청구항 ▼

Vented tank cap apparatus comprising: cap means for closing a liquid fill opening of a liquid container tank, said cap means including a cap member for covering said fill opening and having a main vent opening therethrough; valve means for closing said main vent opening, said valve means including a

Vented tank cap apparatus comprising: cap means for closing a liquid fill opening of a liquid container tank, said cap means including a cap member for covering said fill opening and having a main vent opening therethrough; valve means for closing said main vent opening, said valve means including a main valve member mounted on said cap member for normally closing said main vent opening in a closed position; resilient closure means for resiliently urging said main valve member into said closed position but allowing it to open when the pressure within said tank exceeds a predetermined pressure; and fusible means operatively coupled to the main valve member for closing the main vent opening and for releasing said main valve member and enabling it to move from said closed position to an open position when said fusible means melts.