초록

In addition, a positive displacement compensator can be used in conjunction with the gas driven pump in order to further regulate the process flow.

대표청구항 ▼

[ What is claimed is:] [4.] A method for accurately pumping process fluid, the method comprising the steps of:disposing a first chamber containing gas and a second chamber containing intermediate fluid within a housing, wherein the gas in said first chamber has a pressure;disposing a diaphragm in co

[ What is claimed is:] [4.] A method for accurately pumping process fluid, the method comprising the steps of:disposing a first chamber containing gas and a second chamber containing intermediate fluid within a housing, wherein the gas in said first chamber has a pressure;disposing a diaphragm in communication with said intermediate fluid within said housing and with said process fluid, wherein said diaphragm is within said second chamber;disposing a piston in between said first chamber and said second chamber, wherein the piston is movable between said first chamber and said second chamber;selectively varying the gas pressure in the first chamber, thereby varying the position of the piston, the intermediate fluid, and the diaphragm and enabling accurate pumping of said process fluid;measuring the gas pressure;measuring the displacement of the piston;analyzing the relationship between gas pressure and piston displacement; andadjusting the gas pressure to move the piston.