当按照SAE J1859中概述的试验程序进行试验时，本SAE推荐规程规定了行车制动控制系统中使用的先导式和机械驱动调制型阀以及直通式阀的最低公差要求。本文件适用于车辆原始设备制造商规定的标称输入输出特性，以及SAE J1860中概述的阀门制造商标记的标称输入输出特性。公差要求包括:裂纹（开口）压力或力。裂纹压力可在初始输出压力下测量，或在输出压力超过14 kPa（2 psi）之前的压差下测量。可在初始输出压力下或输出压力超过14 kPa（2 psi）之前测量裂纹力。 压差（输入输出）

This SAE Recommended Practice establishes minimum tolerance requirements for pilot operated and mechanically actuated modulating type valves, and through type valves used in the service brake control system when tested in accordance with the test procedure outlined in SAE J1859. This document applies to the nominal input-output characteristics as specified by vehicle original equipment manufacturer and labeled by the valve manufacturer as outlined in SAE J1860. The tolerance requirements will include:Crack (opening) pressure or force. Crack pressure may be measured at the initial output pressure or as the pressure differential before output pressure exceeds 14 kPa (2 psi). Crack force may be measured at initial output pressure or before output pressure exceeds 14 kPa (2 psi).Pressure differential (input-output)