Pressure modulator

A method for controlling passage of a pressure signal, the method comprising:

• providing an apparatus for controlling passage of a pressure signal, the apparatus comprising:
• a first passageway for a first fluid therein;
• a second passageway for a second fluid therein;
• a chamber interposed between the first and second passageways, the chamber being partially bounded by a first wall adjacent a junction of the first passageway to the chamber and a second wall adjacent a junction of the second passageway to the chamber, the first wall being contoured as a convex shape with regard to the chamber and the second wall being contoured as a convex shape with regard to the chamber;
• a first, movable diaphragm located across a junction of the first passageway and the chamber, the first diaphragm being movable to plural positions including a position with the first diaphragm pressed against the first wall;
• a second, movable diaphragm located across a junction of the second passageway and the chamber, the second diaphragm being movable to plural positions including a position with the second diaphragm pressed against the second wall;
• a third fluid, the first and second diaphragms bounding the third fluid there between and interposed between the first and second passageways at the chamber;
• and
• a device for varying a volume of the third fluid bound between the first and second diaphragms and interposed between the first and second passageways at the chamber, a variation of the volume of the third fluid moving the first and second diaphragms, the device including a movable member and a reservoir in fluid communication with the third fluid bound between the first and second diaphragms, and the movable member being movable to vary the volume of the reservoir;
• and
• moving the movable member sufficiently to decrease the volume of the reservoir to introduce a sufficient portion of the third fluid between the first and second diaphragms into the chamber to cause the first and second diaphragms to be pressed against the first and second walls, respectively.