Pressure regulator for industrial process exhaust system

A pressure regulation system for an industrial process system connected to a pollution control system comprising:

• an elongated process emission duct connecting the industrial process equipment to said pollution control equipment;
• a regulator blade in said duct pivoted for rotation about an axis transverse thereto;
• a discrete sensor duct extending parallel to said process emission duct of relatively smaller cross section, said sensor duct having an inlet and an outlet connected to said emission duct at longitudinally spaced locations on said emissions duct for conducting fluid laterally into and out of said sensor duct, said sensor duct having an arcuate section for the acceptance of a rotatable sensor blade;
• a sensor blade in said sensor duct between the inlet and outlet thereof and pivoted for rotation relative to said sensor duct about the axis of generation of the arcuate section in said sensor duct so as to substantially close said sensor duct at all times whereby a relatively small amount of process emission flow is directed at said sensor blade at minimum approach velocity and the pressure differential thereacross is independent of blade angle;
• and
• a linkage connecting said sensor and regulator blades whereby rotation of said sensor blade effects rotation of said regulator blade to vary the cross-sectional area of said emissions duct inversely to a change in the pressure differential across said sensor blade.