A bell-mouth is a bell-shaped extension at the end of a pipe.
A bell-mouth may also be referred to as a suction bell-mouth. A bell-mouth may be used in gas or liquid applications and is typically placed on the inlet. When placed on the outlet they may be referred to as a diffuser. Bell-mouths are commonly incorporated into a pulsation dampener or anti-surge tank design which contain one or more choke-tubes. The bell-mouth configuration reduces entrance pressure losses as the gas or liquid enters into the pipe in which the bell-mouth is attached. This is accomplished because the shape of the bell-mouth results in a low resistance coefficient which is also called the K factor. The K factor is one of the variables used in determining entrance and exit pressure drops.
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