Patent ID: 6708715
Filing Date: 2004-03-23
Classification: G05D,Y10T

Abstract:
A pneumatic pressure control means for producing at least two different pressures in a load line, said pneumatic pressure control means including a jet pump comprising:a branch flow duct connected to the load line; a principal flow duct communicating at one end with said branch flow duct and having an outlet flow opening at an opposite end thereof; an adjustable back pressure means adjacent said outlet flow opening, said adjustable back pressure means influencing a pneumatic flow through said principal flow duct such that a pneumatic pressure in said branch flow duct may be changed; a pressure sensor in communication with said branch flow duct for measuring the pressure therein and generating a pressure signal based on said measured pressure; and a controller connected to said pressure sensor and said adjustable back pressure means, said controller receiving said pressure signal from said pressure sensor and controlling said adjustable back pressure means based on said received signal.