Federal Models
The air switching valve (ASV) is designed to redirect air flow from the air pump to the check valve or to the atmosphere. When manifold pressure is higher than specified, the valve allows air to flow to the check valve.
When manifold pressure is lower than specified, the air valve shuts air flow to the check valve, and at the same time vents pressure to the atmosphere.
The ASV is operated by air pump pressure and by intake manifold vacuum through the vacuum switching valve. The ASV redirects air flow from the air pump to either the check valve or to the atmosphere.
When manifold vacuum is applied to pipe 1, the ASV allows air to flow from air pump to the check valve. When the vacuum switching valve directs air pump pressure to pipe 1, the ASV shuts air flow to air injection manifold, and at the same time vents pressure to the atmosphere (air cleaner).