Fuel tank safety valve

A fuel tank system constructed in accordance to one example of the present disclosure includes a fuel tank, a purge canister and a valve assembly. The valve assembly can be fluidly coupled between thefuel tank and the purge canister. The valve assembly can include a main valve and a safety check valve. The main valve can have a main valve first port fluidly coupled to an outlet of the fuel tank and a main valve second port fluidly connected to the purge canister. The safety check valve can be configured to move from an open position to a closed position upon a pressure drop at the fuel tank outlet exceeding a predetermined threshold. The safety check valve can have a safety check valve first port fluidly coupled to the outlet of the fuel tank and a safety check valve second port fluidly coupled to the purge canister. 根据本公开的个示例构造的燃料箱系统包括燃料箱，净化罐和阀组件。阀组件可以流体地联接在燃料箱和净化罐之间。阀组件可以包括主阀和安全止回阀。主阀可以具有流体地联接到燃料箱的出口的主阀第端口和流体地连接到净化罐的主阀第二端口。安全止回阀可以配置成在燃料箱出口处的压降超过预定阈值时从打开位置移动到关闭位置。安全止回阀可以具有流体地联接到燃料箱的出口的安全止回阀第端口和流体地联接到净化罐的安全止回