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[[File:两段式球阀.jpg|缩略图|右]]|thumb|400px|right|[http://www.povvalve.cn/wp-content/uploads/2020/04/DSC_0369-450x450-1.jpg 原图链接][http://www.povvalve.cn/product/two-stage-pneumatic-three-way-ball-valve/ 图片来自普雷沃流体控制科技（芜湖）有限公司网]]]