直通控制 meaning in English

right through control

Industrial - process control valves - part 3 - 1 : dimensions - face - to - face dimensions for flanged , two - way , globe - type , straight pattern and center - to - face dimensions for flanged , two - way , globe - type , angle pattern control valves
工业过程控制阀第3 - 1部分：尺寸两通球形直通控制阀法兰端面距和两通球形角形控制阀法兰中心至法兰端面的间距