flashing/through-bolt connection阀门方面? The largest drawback to using a butterfly valve is that its service is limited to low pressure drops because of its high-pressure recovery. Although flashing is not associated with butterfly valves, cavitation and choked flow easily occur with high pressure drops. When compared to plug and ball valves, butterfly-valve bodies have a very narrow face-to-face. The faces of the butterfly valve body are serrat- ed to allow the use of flange gaskets for installation in the pipeline. In many cases, this allows the body to be installed between two pipe flanges using a through-bolt connection. Through-bolting is only permissi- ble with certain bolt lengths, since thermal expansion of the process itself or an external fire may cause leakage. 没有理解这个螺栓的要求。查看更多7个回答 . 2人已关注