薄体型蝶阀
wafer style butterfly valve
大型蝶阀
large-scale butterfly valve
蝶型弹簧安全阀
butterfly spring safety valve
铁饼型蝴蝶阀
Discus type butterfly valve
调节蝶阀
regulating butterfly valve
蝶阀+止回阀式进气阀
butterfly valve + non-return intake valve
蝶阀流道优化设计
stream optimum design of the butterfly valve
蝶阀密封结构
butterfly valve’s seal structure