The flange plane of the intake is perpendicular to the flange plane of the working opening.
吸入口法兰平面与工作口法兰平面相垂直。
Throttle flange is used for throttle installation; it's welded on the main air intake pipe of engine to connect with throttle.
节气门安装法兰主要用于节气门的安装，节气门安装法兰焊接在发动机的进气总管上方以方便节气门和发动机的进气总管的连接。
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