Air monitoring valve for combustion engines

An air monitoring valve for combustion engines comprising:

• a housing providing an air cylinder having an air inlet opening and an air discharge passage, the latter being adapted for connection to an engine intake manifold;
• means providing a valve seat in said cylinder and a pressure-responsive valve mounted in said cylinder for movement to and from said seat to regulate airflow in said discharge passage as a function of intake manifold pressure, said piston being formed to simultaneously provide a predetermined airflow past said piston and said pressure-responsive movement of said piston;
• a stem threadably mounted in said cylinder and extending therefrom longitudinally thereof in the direction of, and having an end accessible through, said air inlet opening, said valve being mounted on said stem for longitudinal reciprocation in said cylinder to and from said seat;
• spring means mounted between said stem and valve for biasing said valve away from said seat;
• and
• a resiliently deflectable plate supported by said housing adjacent said inlet opening and formed with an opening aligned with and providing an interference fit with said stem end and affording access to said stem end for turning, said plate resiliently deflecting with rotative adjustment of, and applying longitudinal pressure to, said stem.