def psLoopFlush
	#this should be run after SH2 completes 
	loadFlush :processing
	PSV.to :PSR
	PSR.to :flush
	PS.to 1
	PSR.to :air
	PS.fill
	PSV.to :PTV
	PBV.to :waste1
	PS.to 0
	PSV.to :PSR
	PSR.to :flush
	PS.to .5
	PSR.to :air
	PS.fill
	PSV.to :PTV
	PS.to 2
	PBV.to :PSV
	PS.to 0
	PSV.to :PBV
	PS.fill
	returnFlush :processing
	PSV.to :waste1
	PS.to 0
end