Oscillating dual bladder balanced pressure proportioning pump system

An apparatus for continuously and proportionately injecting an injection fluid into a pressurized conduit flowing with a working fluid, comprising:

• a first pressure differential creating device disposed in and forming part of the pressurized conduit and creating therein a first pressure region and a second pressure region having a lower pressure than the first pressure region;
• a second pressure differential creating device creating a first pressure region and a second pressure region having a lower pressure than the first pressure region of the second pressure differential creating device;
• a first vessel enclosing a first flexible element that divides the first vessel between a first injection fluid chanber and a first working fluid chamber;
• a second vessel enclosing a second flexible element that divides the second vessel between a first injection fluid chamber and a second working fluid chamber;
• wherein the first and second injection fluid chambers are selectively connected to the second pressure region of the pressurized conduit and are selectively, automatically and continuously filled, emptied and refilled with the injection fluid, and wherein the first and second working fluid chambers are selectively. automatically and continuously filled with and emptied of the working fluid;
• the injection fluid being thereby continuously combined at a predetermined proportion with the working fluid at the low pressure region of the pressurized conduit independent of the working fluid flow rate and pressure while maintaining a continuous flow of working fluid through the pressurized conduit.

A method of combining an injection fluid into a working fluid, comprising:

• providing first and second vessels, each vessel divided by a flexible element into a working fluid chamber and an injection fluid chamber;
• selectively and alternately filling the injection fluid chambers of the first and second vessels with working fluid;
• directing a first part of the working fluid to flow through a first pressure differential creating device;
• directing a second part of the working fluid to selectively and alternately flow through a second pressure differential creating device and into and out of the working fluid chambers of the second and first vessels;
• selectively and alternately emptying the injection fluid contained in tihe injection fluid chambers into a low-pressure region created by the first pressure differential creating device;
• automatically and alternately refilling the injection fluid chambers with injection fluid while ensuring a constant flow of working fluid through the first pressure differential creating device;
• whereby the alternate filling, emptying and refilling of the working and injection fluid chambers of the first and second vessels provides a constant and continuous proportioning of injection fluid into the working fluid, the proportioning being independent of working fluid pressure and flow rate.