| 1. | Purpose : to test check valve no . 2 for tightness against reverse flow
目的：检测止回阀2号对于回流的紧密度。 |
| 2. | Remove bypass hose from test cock no . 1 , open shutoff valve no . 1
从测试旋塞1号上拆卸旁路软管，开启1号关闭阀。 |
| 3. | Close valve no . 3 & no . 4
把三号和四号阀门关上！ |
| 4. | Purpose : to test check valve no . 2 for tightness against reverse flow
目的：检测止回阀2号对于回流是否紧密密封。 |
| 5. | Open valve no . 1 & no . 2
一号、二号阀门，开阀！ |
| 6. | Open valve no . 3 & no . 4
三号、四号阀门，开阀！ |
| 7. | Close valve no . 3 no . 4
把三号和四号阀门关上！ |
| 8. | Open valve no . 1 no . 2
一号二号阀门，开阀！ |
| 9. | Open valve no . 3 no . 4
三号四号阀门！ |
| 10. | Slightly open shutoff valve no . 1 and allow water to fill the tube to the top then close no . 1 shutoff
稍微开启关闭阀1号，将水注入管子直到顶部为止，然后关闭1号关闭阀。 |
