Processing design of two kinds of hydraulic castings with difficult manufacturing was described. For multi-spool control valve body

cavity design with frame core head was adopted

and gating system design followed sequential solidification of heat-riser

where metal melt is filled from sprue

runner

restraint-slag channel to riser and then to cavity. For port plate of pintle blade-pump

a design scheme in which all oil ports were set on the disc core head was adopted.