 |
| discharge valve: 70 phrases in 33 subjects |
| Aerohydrodynamics | 4 |
| Armored vehicles | 1 |
| Astronautics | 3 |
| Automobiles | 1 |
| Biology | 1 |
| Chemistry | 1 |
| Construction | 2 |
| Drilling | 1 |
| Electrical engineering | 1 |
| Electronics | 3 |
| Energy industry | 3 |
| Firefighting and fire-control systems | 4 |
| General | 1 |
| Hydraulics | 1 |
| Makarov | 2 |
| Mechanic engineering | 2 |
| Mining | 1 |
| Nautical | 3 |
| Oil / petroleum | 6 |
| Oil and gas | 2 |
| Oil and gas technology | 4 |
| Oilfields | 1 |
| Pipelines | 1 |
| Production | 1 |
| Rail transport | 1 |
| Refrigeration | 2 |
| Sakhalin | 1 |
| Shipbuilding | 1 |
| Technology | 11 |
| Thermal engineering | 1 |
| Torpedoes | 1 |
| Transport | 1 |
| Water supply | 1 |