燃油液位控制阀/系统控制飞机油箱中正在加注或排空的燃油量。本文件提供了对这些机制的一般了解（例如，它们采取的形式、功能、系统设计考虑）。本文件为飞机燃油系统设计师提供了有关这些机构/装置的信息，以便他能够规定最适合其特定燃油系统配置的液位控制阀/系统的类型。由于不同的飞机制造商可能会使用不同类型的燃油系统结构，因此范围有所扩大。 它们的加油和除油系统可能采用不同的配置，可能需要不同类型的燃油控制阀，可能需要不同类型的与车载燃油测量系统的接口。它们还必须限制压力浪涌，并与具有不同浪涌电位并产生浪涌的地面加油设备兼容。

A fuel level control valve/system controls the quantity of fuel in a tank being filled or emptied on the aircraft. This document provides a general familiarization with these mechanisms (e.g., forms they take, functions, system design considerations). This document provides the aircraft fuel system designer with information about these mechanisms/devices, so that he can prescribe the types of level control valves/systems which are best suited for his particular fuel system configuration.The scope has been expanded as different aircraft manufacturers may use different type of fuel system architectures. Their refueling and defueling systems may take different configurations, may require different types of fuel control valves and may require different types of interface with the onboard Fuel Measurement System. They must also limit pressure surges and be compatible with ground refueling equipment which have varying surge potentials and create surges.