Check Valve

Check valve is a one-way flow valve. It prevents exhaust manifold air from backing up through the system and reaching air pump. Check valve will be found either in tubing, leading to injection manifold or as an integral part of manifold.

Fig 1: Three Different Types of Air Injection Systems Used (V8)

Courtesy of FORD MOTOR CO.

Fig 2: Ford Motor Co. Timed & Vented By-Pass Valve

Courtesy of FORD MOTOR CO.