| 摘要 |
<p>A vent valve (10) for use with a fuel containing system (13) including a fuel tank (1,4) and a vapor recovery system (15). The vent valve includes a housing (34) which communicates with the fuel tank and the vapor recovery system. The housing 5 defines a path (77) between the fuel tank and vapor recovery system. A float valve (69) is positioned in. the housing and is responsive to the presence of fuel in the tank. The housing has at least one vacuum vent (58) positioned in the path. An umbrella valve (48) is carried on the housing and positioned between the fuel tank and the vapor recovery system. The umbrella valve has a wall (71) defining an orifice (70) extending therethrough and a cower portion (62) extending from the wall. The orifice is selectively sealed at one end (68) by the float valve and is selectively sealed at the opposite end (64) by the bead valve (65). The covering portion of the umbrella valve displaceably overlies the vacuum vent for preventing passage of liquid fuel and fuel vapor through the vent when the force against the covering portion is generally positive relative to the fuel vent and covering portion. The coveting portion allows passage of liquid fuel ad fuel vapor through the vent when the force on the covering portion is greater than the resisting force of the covering portion thereagainst. <IMAGE></p> |
