标准尺寸为300 mm/4英寸（无法兰）和300 mm/4英寸（无法兰）的滑动控制阀。所列的面对面尺寸仅适用于用螺栓固定在法兰之间的控制阀。本标准不包括旋转阀，如蝶阀。目的本标准旨在通过提供阀门面对面的尺寸，而无需特别考虑拟使用的设备制造商，帮助用户进行滑杆无法兰控制阀的管道设计。

This standard applies to sliding stem flangeless control valves, sizes 20 mm (3/4 inch) through 600 mm (24 inches) for Classes 150, 300, and 600.The face-to-face dimensions listed apply only to control valves that will be bolted between flanges.This standard is not intended to include rotary valves, such as butterfly valves.PurposeThe purpose of this standard is to aid users in their piping designs for sliding stem flangeless control valves by providing valve face-to-face dimensions without giving special consideration to the equipment manufacturer to be used.