In the paper,the reasons for forming measuring errors in the Roots flowmeter LLQ and orifice holder dual bellows CWD-430 differential pressure flowmeter applied in natural gas markets for a long time are simply analyzed;

• 文章简要分析了天然气市场长期来使用的LLQ型腰轮流量计、孔板夹持器配CWD - 430双波纹管差压计产生计量误差的原因。