| 1. | Double check valve backflow - prevention assembly
双止回阀防回流组件 |
| 2. | A double check valve assembly shall be installed at each noted location
双止回阀总成应该安装在每个指定的位置。 |
| 3. | Series 719 double check valve assembly shall be installed at each noted location
系列719双止回阀总成应该安装在每个标注的位置上。 |
| 4. | The double check valve assembly shall be a watts regulator company series 774x
这种双止回阀总成应该是美国瓦茨调节阀公司系列774x 。 |
| 5. | Watts dual check valves may be installed in either a vertical or a horizontal position
美国瓦茨双止回阀可以安装在垂直或水平位置上。 |
| 6. | Watts series 709 double check valve may be installed in either a vertical or horizontal position
美国瓦茨系列709双止回阀可以安装在垂直或水平位置上。 |
| 7. | Compressed air equipment for rail vehicles - double check valves - installation and companion dimensions
铁路车辆用压缩空气装置.双止回阀.安装和连接尺寸 |
| 8. | Double check detector assembly shall be installed on fire protection systems when connected to a potable water supply
当消防系统连接到饮用水供应系统时，应该安装一个双止回阀总成。 |
| 9. | A double check detector assembly shall be installed on fire protection systems when connected to a potable water supply
当消防系统连接到饮用水供应系统时，应该安装一个双止回阀总成。 |
| 10. | Tests the individual check modules of the watts series 7 residential dual check . also used to test series 709 and 007
检测美国瓦茨系列7家用双止回阀的单个止回阀模块。也用于检测系列709和007 。 |
