Gating System-

Gating system serves to deliver molten metal to all corners of mould cavity and is designed to minimize turbulence and erosion. The molten metal is poured into the pouring basin and it moves through the sprue to enter the runner. The sprue is usually tapered down to prevent aspiration of gasses through the sprue. The sprue well serves to dissipate the kinetic energy of falling molten metal before it enters the runner through the choke. The choke is provided to avaid the creation of vacuum, since the liquid metal tends to contract when there is a sudden change in the flow direction.