计量孔板由铸铁法兰，密封垫，孔板（铸铁或不锈钢）组成。
They are built with cast iron flanges, gaskets and orifice plates (either mild steel or stainless).
天然气计量现在仍以差压式流量计中的孔板流量计为主。
The metering of natural gas still presently depends on orifice flowmeter, one of differential pressure flowmeters.
仪器重量轻，操作简便，便于携带，是深孔加工行业质量检测部门不可多得的实用计量仪器。
This instrument is greatly welcomed by quality test department of deep-hole process industry because of its light weight, simple operation and convenient carrying.
对于天然气计量用的智能孔板流量积算仪，流量的计算方法对计量结果有非常重要的意义。
The method of measuring is important to the measurement of natural gas flux for an intelligent orifice plate flow totalizer.
顶端厚：涉及到保持架窗口在上端部所留钢铁的厚度，以高度计量。(参考：窗孔)。
TOPS: Refers to thickness of steel left at upper end of pocket, measured in height. (See: pocket).
顶端厚：涉及到保持架窗口在上端部所留钢铁的厚度，以高度计量。(参考：窗孔)。
Refers to thickness of steel left at upper end of pocket, measured in height. (See: pocket).
综合分析了影响孔板流量计计量精度的主要因素，提出了提高孔板流量计计量精度的有效措施。
Comprehensively analyzed are the main factors that affect the measuring accuracy of the orifice flowmeter. Proposed are some effective measures to improve its measuring accuracy.
通常使用的是基孔 制，因为这会减少所需要的钻头、铰刀、拉刀和计量工具的种类。
Usually the hole-based system is used, as the results in a reduction in the variety of drill, reamer, broach and gauge tooling required.
通常使用的是基孔 制，因为这会减少所需要的钻头、铰刀、拉刀和计量工具的种类。
Usually the hole-based system is used, as the results in a reduction in the variety of drill, reamer, broach and gauge tooling required.
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