A flapper valve assembly is described having an equalizing port assembly (32) with a bleed valve member (64) that is moveable between an open position and a closed position.

• 本发明公开了一种挡板阀组件，挡板阀组件具有补偿口组件(32)，补偿口组件(32)带有可在打开位置与关闭位置之间移动的排放阀元件(64)。