 |
| air valve: 67 phrases in 13 subjects |
| Chemistry | 3 |
| Construction | 7 |
| Earth sciences | 4 |
| General | 1 |
| Information technology | 2 |
| Laboratory equipment | 1 |
| Materials science | 1 |
| Mechanic engineering | 22 |
| Medical appliances | 3 |
| Metallurgy | 3 |
| Pest control | 2 |
| Technology | 3 |
| Transport | 15 |