Patent ID: 6955664

Claim:
A system for regulating suction pressure, said system comprising: a suction chamber connectable to a suction source to create subatmospheric pressure within said suction chamber; an atmospheric chamber communicable with said subatmospheric chamber, said atmospheric chamber being exposed to the atmosphere to create atmospheric pressure within said atmospheric chamber; a dividing apparatus for dividing said suction chamber and said atmospheric chamber, said dividing apparatus having an opening for rendering said suction chamber and said atmospheric chamber in communication with each other; a movable member for varying the size of said opening between an open position and a closed position; a biasing device for imposing a biasing force on said movable member to bias said movable member towards the open or the closed position; and a pressure sensing apparatus operatively connected to said movable member for generating a force on said movable member opposite to the biasing force for effecting movement of said movable member in accordance with changes in the pressure differential between said suction chamber and said atmospheric chamber to vary the size of said opening to regulate the airflow around said movable member from said atmospheric chamber to said suction chamber to accordingly regulate the pressure in said suction chamber; said movable member being mounted near said opening for not vibrating in response to the airflow through said opening, and said system having no means for damping said movable member.