根据磷酸、磷铵生产过程中输送介质的特性，结合我国１５年来建设和生产磷酸、磷铵的实践经验，讨论并推荐磷酸、磷铵生产过程中管道与阀门的选取。 According to the characteristics of transportation medium in the production of phosphoric acid and ammonium phosphate, combined with the practical experience of building and producing phosphoric acid and ammonium phosphate in our country over the past 15 years, we discuss and recommend the selection of pipes and valves in the production of phosphoric acid and ammonium phosphate.