| 1. | Reduced pressure detector assembly backflow preventer
减压检测器组合防回流装置 |
| 2. | Four required per backflow preventer
每个防回流阀需要四个。 |
| 3. | Laboratory faucet backflow preventer
实验室旋塞防回流装置 |
| 4. | For use with backflow preventer test cocks to protect from damage
用于防回流阀测试旋塞，防止受到破坏。 |
| 5. | 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。 |
| 6. | 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。 |
| 7. | Performance requirements for backflow preventer with intermediate atmospheric vent
有中气压通风口的防回流装置的性能要求 |
| 8. | Backflow preventer manufactured from 300 series stainless steel for corrosion resistance
防回流阀采用耐腐蚀的300系列不锈钢制造。 |
| 9. | The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer
带测试旋塞的关闭阀安装在防回流阀的进口一侧。 |
| 10. | The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer
带测试旋塞的关闭阀应该安装在防回流阀的进口侧。 |
