Patent ID: 8616228

Claim:
A method for regulating the pressure of a fluid, said fluid having a prevailing temperature, comprising the steps of: a. providing a first regulator having a piston having first and second ends having unequal surface areas; b. inserting said first regulator into said fluid; c. allowing said first regulator to reach the prevailing temperature of said fluid; d. allowing said fluid to apply fluid pressure to said first end of said piston; e. allowing said fluid to flow to and apply said fluid pressure to said second end 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; f. 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, providing a first regulated pressure fluid; while g. allowing said prevailing temperature of said fluid to maintain said regulator at isothermal condition; while h. providing a zone between the first and second ends of said piston which can be maintained at a reference pressure derived from a source downstream of said first regulator.