 |
| pressure operated valve: 29 phrases in 13 subjects |
| Apollo-Soyuz | 1 |
| Automated equipment | 2 |
| Energy industry | 2 |
| General | 2 |
| Nuclear and fusion power | 2 |
| Oil / petroleum | 4 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
| Oilfields | 1 |
| Refrigeration | 1 |
| Sakhalin | 4 |
| Technology | 7 |
| Tengiz | 1 |