Diverter Valve

The diverter valve is also used to prevent backfire in the exhaust system during sudden deceleration. The valve senses sudden increases in intake manifold vacuum causing the valve to open. This allows air from the air pump to pass, through the valve and silencer, to the atmosphere.

A pressure relief valve controls pressure within the system by diverting excess pump outlet air (developed at higher engine speeds) to the atmosphere through the silencer.