| release the pressure | 0.68 |
| control the gas supply | 0.46 |
| reclose further release… | 0.46 |
| prevent leak | 0.25 |
| receive compressed air | 0.25 |
| a valve mechanism | 0.62 |
| automatic valve | 0.41 |
| set | 0.84 |
| opened | 0.65 |
| closed | 0.50 |
| tested | 0.38 |
| used in boiler | 0.33 |
| used in pressure vessels | 0.33 |
| delivered with the comp… | 0.25 |
| kept locked | 0.25 |
| used by respondent | 0.25 |