... azeotropic mixture refrigerant共沸溶液制冷剂 back-flow preventer防回流装置 back pressure of steam trap凝结水背压力 ...
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Back flow preventer 回流防喷 ; 防喷流回 ; 背流防喷器
back-flow w preventer 防回流装置
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The user installs a dual check back flow preventer at the water meter as prescribed by the supplier of safe drinking water.
用户要由安全饮用水供应商在水表处安装法定的双止回防回流阀。
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