当按照SAE J1859中概述的试验程序进行试验时，本SAE推荐实施规程规定了行车制动控制系统中使用的先导式和机械致动式调节阀以及直通式阀的最小公差要求。本文件适用于SAE J1860中概述的由车辆原始设备制造商指定并由阀门制造商标记的标称输入输出特性。公差要求将包括: 一个 裂开（打开）压力或力。裂纹压力可以在初始输出压力下测量，或者作为输出压力超过14kPa(2psi)之前的压差测量。破裂力可以在初始输出压力下或在输出压力超过14kPa(2psi)之前测量。 b 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: a 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). b Pressure differential (input-output)