Eccentric quarter turn butterfly (or double or triple eccent

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Eccentric quarter turn butterfly (or double or triple eccentric)蝶阀D343H中的描述,急

把阀蝶开2--3个刻度
eccentric quarter；阀的偏转装置,开阀装置.
butterfly,阀内挡板,

Eccentric quarter turn butterfly (or double or triple eccent double or triple Tripe eccentric butterfly valve double or nothing single double triple triple-double什么意思新概念英语第三册 29课 funny or not 及31课 a lovable eccentric 的错误 turn 加to do or doing? give it up or turn it loose turn a switch on or off Did he turn round or not? Double Flanged Butterfly Valve 是什么