1.
The Figure85 and90 M are designed to employ an integral back-flow prevention device to prevent potential back-siphonage.
型号85和90M结构上配置一个一体式防回流装置，用以防止潜在的反虹吸现象。
2.
anti-fall device of rotary machinery
回转小车防坠制动装置
3.
A strainer should be installed as shown, ahead of the backflow preventer to prevent discs from unnecessary fouling.
应该如图所示安装一个过滤器，安装位置位于防回流阀之前，以防止不必要的污染。
4.
The device should not be installed inside a wall or in a concealed location. Copper tubing shall not be used on the downstream side of the backflow preventer.
这种装置不应该安装在墙内或隐蔽的位置。在防回流阀下游不能采用铜管。
5.
A strainer should be installed as shown, ahead of backflow preventer to prevent disc from unnecessary fouling.
应该如图安装过滤器，其位置位于防回流阀之前，以防止阀瓣不会受到不必要的污染。
6.
Installing a backflow preventer in a pit or vault is not recommended.
不建议在坑内或拱顶内安装防回流阀。
7.
Copper tubing shall not be used on the downstream side of the backflow preventer.
在防回流阀的下游不应该安装铜管。
8.
A check valve may be required ahead of the backflow preventer.
此时在防回流阀前面可能需要安装一个止回阀。
9.
The Study of Antisepsis Method and Equipment of Oil Field Injection Water Pipeline Germ Corrosion;
油田回注水金属管道防腐方法及其装置的研制
10.
The Mechanism Analysis and Protective Measures of Sulfur Recovery Unit Corrosion
硫磺回收装置腐蚀机理分析及防护措施
11.
Corrosion and Protective Measures of Sulfur Recovery & Tail Gas Treatment Plant
硫磺回收及尾气处理装置的腐蚀与防护
12.
Analysis on the Corrosion and Protection of the MCRC Sulfur Recovery Unit of Northwest Sichuan
浅析川西北MCRC硫磺回收装置的腐蚀与防护措施
13.
Design of Wire Breakage Protection Device for Vertical Rotation WEDM
立式回转线切割机床电极丝防松装置的设计
14.
To furnish(a device or object) with a protective piece.
加防护装置给（器械或物品）装防护装置
15.
proximity protection device
防夹装置〔升降机〕
16.
check-valve mounting bracket
止回阀(装置)托架
17.
Contamination-proof is an absolute necessity in the maintenance of fluidic devices.
防止污染对保养射流装置是绝对必要的.
18.
Design of Liquid Flow System and Mechanism for Anti-Freeze Fluid Sprinkling Machine of Coal Conveyor;
运煤车防冻液喷洒装置液流及机械系统设计