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| The graph below represents actual test data of a butterfly valve showing change in F1 with plug rotation. | |
| The data demonstrate why a rotary control valve can suddenly go into cavitation as the valve opens up. | |
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| The graph below represents actual test data of a butterfly valve showing change in F1 with plug rotation. | |
| The data demonstrate why a rotary control valve can suddenly go into cavitation as the valve opens up. | |
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