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可提供前后各2D或特殊要求長度的測量管段，（D為管道內徑）
We can provide 2D measurement pipe sections or those of lengths of special requirements for the front and back respectively (D refers to the pipe inside diameter).
用途：適用于前后直管段長度不能滿足單孔孔板標準要求的氣體、液體和蒸汽等流量測量、控制和調節(jié)。
Use: It is fit for the measurement,control and adjustment of the flow of gas ,liquid or steam which the lengths of the front and back pipe can not meet the requirments of single hole orifice .
特點：它具有前后直管段長度要求低、測量精度高、造價低、安裝使用維護方便的特點。
Features：a low requirement of lengths for the front and back pipe, a hign measurement precision, a low construction cost, easy mounting、using and maintenance etc .
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