本SAE推荐规程由越野机械技术委员会第4小组委员会制定，主要适用于SAE J1116中引用的建筑和工业机械设备上的方向控制阀。其目的是建立端口面积与流量的关系，并根据额定容量匹配滑阀孔端。对于4螺栓对开法兰连接或内部直螺纹“O”形环连接，端口连接是可选的。

This SAE Recommended Practice has been set up by Subcommittee 4 of the Off-Road Machinery Technical Committee and is primarily for directional control valves on construction and industrial machinery equipment as referenced in SAE J1116. The purpose is to establish port area to flow relationship and match valve spool eye ends in relation to rated capacity.Port connections are optional for either the 4-bolt split flange connection or the internal straight thread "O" ring connection.