This valve is a combined regulating and flow measurement device and must be installed with five diameters of straight pipe of the same diameter as the valve without intrusion upstream of the valve.是什么意思_This valve is a combined regulating and flow measurement device and must be installed with five diameters of straight pipe of the same diameter as the valve without intrusion upstream of the valve.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句