EFD.Lab’s new CAD-integrated computational fluid dynamics (CFD) software saved time in the design of a flush valve by enabling Johnson Design engineers to solve design problems using software rather than hardware prototypes. A feature in Johnson Design’s Denali Flushometer flush valve is that it delivers a fixed volume of water independent of the position of the restriction on the rolling diaphragm which is randomly installed at various positions during the valve assembly. Johnson Design Engineering Manager Mr Dustin Borg used EFD.Lab to evaluate the performance of the valve as the restriction was rotated 360 degrees in order to ensure that it delivered the right amount of water in each position. Flush valves operate by taking advantage of pressure differentials between the inlet and control chambers. The pilot valve, when engaged by the handle, vents the control chamber lowering its pressure and allowing the rolling diaphragm to open which in turn begins the flush cycle.