butterfly gas valve
vacuum butterfly valve
1 3 way ball valve
butterfly valve seals
The internal parts of the valve body, valve stem, valve seat, packing set, valve plug, gasket, etc. are collectively referred to as valve trim. In other words, all wetted parts that can be disassembled and replaced in the valve body are part of the control valve trim.
But valve body and bonnet that comes in contact with process liquids is not considered as trims.
