It is diaphragm type back pressure valve.With adjustable setting pressure,it can keep metering pumps dosing accuratly and be an anti-syphon.是什么意思_It is diaphragm type back pressure valve.With adjustable setting pressure,it can keep metering pumps dosing accuratly and be an anti-syphon.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句