Fuel tank vent valve
AssigneeStant Manufacturing Inc.
InventorRobert Harris
Life of this patent
Estimating the term…
Abstract
A pressure and vacuum vent valve for a vehicle fuel tank is provided including a structure defining a passageway and having a vent valve assembly positioned therein. The assembly includes a pressure relief valve to relieve pressure from the fuel tank when the pressure exceeds a predetermined level and a vacuum relief valve to relieve a vacuum in the tank when the pressure in the tank drops below a predetermined level. The vacuum relief valve presents a lubricious sealing surface that engages a valve seat. The pressure valve engages a sealing surface to close a central venting orifice provided in the vacuum valve.
Claims14
A vehicle fuel tank vent comprising:
- a structure providing an annular orifice defined by a radially inwardly and peripherally extending edge, the orifice defining a central axis,
- an axially movable first valve member configured to engage and close the orifice,
- a spring urging the first valve member into engagement with the orifice,
- the first valve member providing a frustoconical outer wall facing and extending axially into the orifice, and the outer wall presenting an outer lubricious sealing surface to close the orifice.
A valve assembly for venting a fuel tank, the assembly comprising:
- a structure providing a valve passageway communicating with an interior of the fuel tank and an axially inwardly facing annular valve seat surrounding an orifice, and
- a vacuum valve member normally biased in an axial direction against the valve seat, the vacuum valve member having a frustoconical outer wall facing the valve seat.
A pressure and vacuum vent valve assembly for a vehicle fuel tank comprising:
- a structure providing a passageway having a central axis and communicating with the fuel tank,
- a valve seat disposed in the passageway,
- a movable valve member to engage the valve seat and close the passageway, the valve seat and valve member having surfaces which engage, at least one of the surfaces being provided by lubricious material.
Dependencies are inferred from the claim text.