Patent ID: 7963422
Filing Date: 2011-06-21
Classification: F04B,G01F

Abstract:
1. A process for dispensing fluids, comprising: providing (A) a positive-displacement piston pump apparatus wherein said piston pump apparatus is an air-operated pump comprising first and second pistons each slidably housed within corresponding first and second piston sleeve housings; a shaft member for connecting said pistons; at least one barrier member located between said first and second piston sleeve housings and conformed to permit reciprocating sliding of said shaft member while minimizing air leakage between said first and second piston sleeve housings; said first piston sleeve housing having at least one opening for filling and/or expelling a fluid from said first piston sleeve housing under force of said first piston slidably housed therein; said second piston sleeve housing having a first opening located to admit pressurized air to exert positive force on a first face of said second piston to slidably move said second piston from a first position to a second position within said second piston sleeve housing, said second piston sleeve housing having a second opening located to admit pressurized air operative to exert a positive force on a second face of said second piston to slidably move said second piston from said second position to said first position within said second piston sleeve housing, whereby the positive force of air-pressure is transmitted to said first piston for filling fluid into and dispensing fluid from said first piston sleeve housing; and (B) a suspension load cell connected to said air-operated pump wherein said load cell supports and measures substantially at least 100% of the weight of said air-operated pump and the fluid contained in said first piston sleeve housing, said load cell positioned vertically above said air-operated pump and said air-operated pump positioned to hang from said load cell.