| fluid communication | 0.32 |
| prevent back flow | 0.76 |
| release internal pressu… | 0.47 |
| remain closed | 0.38 |
| prevent the escape of a… | 0.32 |
| feature a variety of po… | 0.25 |
| reduce the work load | 0.25 |
| two-port valves | 0.47 |
| valve | 0.43 |
| mechanical device | 0.38 |
| a one way valve | 0.25 |
| installed | 0.71 |
| designed | 0.56 |
| closed | 0.52 |
| positioned in casing sy… | 0.50 |
| designed for high press… | 0.50 |
| configured to open in r… | 0.47 |
| replaced | 0.44 |
| used in wide variety of… | 0.43 |
| broken | 0.41 |
| disposed | 0.25 |
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