流通能力大、流阻小。这是因为开启后阀芯位于藏球室内，阀体流道呈直筒式。
Flowing capability is big and the flow resistance is little. When the valve opening, the valve core is located inside ball cavity and the flow route is straight tube.
蝶阀在开启时蝶板与流体流向平行，流阻小，流通截面大，阀芯不易被冲刷；
When opening the valve, the valve disc is parallel with the flow direction. The flow resistance is little, the flow section is large and the core will not be eroded.
进气口开大排气口关小使输出压力增加，因此执行机构推杆向下移动使调节阀阀芯开启或关闭。
Large intake vents open so that the output pressure off small increase, thus putting downward movement so that implementing agencies spool valve to open or close.
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