A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?()
- AThe diameter of a disc is the same as the outer diameter of the pipe
- BWe can infer that the valve is opened or closed by rotating the spindle
- CA butterfly valve comprises a disc and a ring body
- DThe profile of the butterfly valve is a ring body