ISO 12619-11:20 17规定了过量流量阀的测试和要求，过量流量阀是一种压缩气态氢气(CGH2)和氢气/天然气混合燃料系统组件，旨在用于ISO 3833中定义的类型的机动车辆。 它适用于根据ISO 14687-1或ISO 14687-2使用CGH2的车辆以及根据ISO 15403-1和ISO/TR 15403-2使用天然气的氢气/天然气混合物的车辆。不适用于下列情形: a)液化氢(LH2)燃料系统部件； b)燃料容器； c)固定式燃气发动机； d)容器安装硬件； e)电子燃料管理； f)燃料补给容器； g)燃料电池汽车。 注1应认识到，可以检查此处未具体涵盖的其他组件以满足ISO 12619-11:20 17的标准，并根据适当的功能测试进行测试。 注2:除非另有说明，否则ISO 12619-11:20 17中所有提及的压力均视为表压。

ISO 12619-11:2017specifies tests and requirements for the excess flow valve, a compressed gaseous hydrogen (CGH₂) and hydrogen/natural gas blend fuel system component intended for use on the types of motor vehicles defined in ISO 3833. It is applicable to vehicles using CGH₂ in accordance with ISO 14687-1 or ISO 14687-2 and hydrogen/natural gas blend using natural gas in accordance with ISO 15403-1 and ISO/TR 15403-2. It is not applicable to the following: a) liquefied hydrogen (LH₂) fuel system components; b) fuel containers; c) stationary gas engines; d) container mounting hardware; e) electronic fuel management; f) refuelling receptacles; g) fuel cell vehicles. NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of ISO 12619-11:2017and tested according to the appropriate functional tests. NOTE 2 All references to pressure in ISO 12619-11:2017are considered gauge pressures unless otherwise specified.