The 770g valve was made for the aerospace industry. To fully understand the complex core geometry of the 3 x 4 x 2-in. part, the casting supplier produced cores using fused deposition modeling. These models helped the casting engineers spot trouble areas that would require special attention. A low pressure semi-pneumatic device was used to fill the core passageways and eliminate air pockets that could cause core breakage or failure. The finished castings were checked via x-ray for core breakage.
