Patent ID: 6827001
Filing Date: 2004-12-07
Classification: F15B

Abstract:
An improved control valve pressure actuator having an upper diaphragm casing having an air port therein, a lower diaphragm casing, a diaphragm positioned between the upper and lower diaphragm casings, the diaphragm being mounted on a diaphragm plate and biased toward a fully open position adjacent an inside surface at a top end of the upper diaphragm casing by one or more springs wherein the air port defines an effective area of the diaphragm such that an air pressure transmitted through the air port creates a operating force across the effective area to oppose a force generated by the springs during operation of the control valve pressure actuator, the improvement comprising:one or more air passage channels within the upper diaphragm casing wherein the air passage channels substantially increase the effective area of the diaphragm thereby generating an additional operating force upon the diaphragm when the diaphragm is motivated from the fully open position.