Patent ID: 8220479

Claim:
A method for regulating the pressure of a fluid comprising the steps of: a. providing a first pressure regulator, comprising a piston having first and second ends having unequal surface areas; b. allowing a fluid to apply fluid pressure to said first and second ends of said piston, providing a force differential in the amount of force applied to said first and second piston ends due to their unequal surface areas; c. utilizing said force differential to facilitate movement of said piston, so as to facilitate throttling of said fluid flow when the force exerted upon one end of said piston is greater than the force exerted by the other end of said piston; while d. providing a zone between the first and second ends of said piston which is referenced at a fluid reference pressure to influence said force differential applied to said first and second piston ends, and the resulting flow of fluid associated therewith; e. providing a second pressure regulator in fluid communication with said first pressure regulator; f. utilizing said second pressure regulator to provide regulated output; and g. utilizing said regulated output to produce said fluid reference pressure of step “d”.