| 1. | Performance requirements for hose connection backflow preventers
软管连接防回流装置的性能要求 |
| 2. | Dual check valve type backflow preventers
双重止回阀型防回流装置 |
| 3. | Full pressure test the ram preventers
对闸板防喷器进行全压试压 |
| 4. | Especially made for testing all reduced pressure zone backflow preventers
专用于检测所有减压区防回流阀。 |
| 5. | Also, mechanical backflow preventers and air gaps can be bypassed
此外，机械式防回流阀和气隙可以作为旁路。 |
| 6. | Performance requirements for backflow preventers on carbonated beverage machines
碳酸盐饮料机械上防回流装置的性能要求 |
| 7. | Therefore, all backflow preventers have to be tested periodically to ensure that they are functioning properly
因此，所有防回流阀必须定期检测，以确保功能正常。 |
| 8. | For use with backflow preventers, isolation valve for gauges, isolation valves for small equipment lines
用于防回流阀，用于仪表的隔离阀，用于小型设备管道的隔离阀。 |
| 9. | A strainer should be installed as shown, ahead of backflow preventers to prevent discs from unnecessary fouling
应该如图所示在防回流阀前安装一个过滤器，防止阀瓣出现不必要的污垢。 |
| 10. | Performance requirements for reduced pressure principle backflow preventers and reduced pressure fire protection principle backflow preventers
减压法防回流装置和减压防火法防回流装置的性能要求 |
