bottom (head) 底封頭 bumped head 沖壓封頭 cast iron circular dished heads 鑄鐵圓形碟形封頭 circular head 圓形封頭 conical head 錐形封頭; 錐形頭 conical head (without straight flange) 無(wú)折邊錐形封頭 conical head with straight flange 帶折邊錐形封頭 conical head without transition knuckle 無(wú)折邊錐形封頭 convex head 凸形封頭 cover flange 封頭法蘭 cover head 頂封頭 dished (torispherical) head 碟形封頭 disked closure (end; bottom) 碟形封頭 dome head 球面底; 球形封頭