COAXIAL PUMPING APPARATUS WITH INTERNAL POWER FLUID COLUMN

摘要

A pump (100) is provided comprising an internal power fluid column (140) and a transfer piston (120), which is reciprocatingly mounted about the power fluid column (140). The transfer piston (120) defines a product fluid chamber (130), located above the transfer piston valve (126), and a transfer chamber (110), located below the transfer piston valve (126). The power fluid column (140) comprises at least one passageway (146), which allows the fluid inside the power fluid column (140) to be in communication with a power fluid chamber (150). The power fluid chamber (150), the transfer chamber (110) and the product chamber (130) are located coaxially about the power fluid column (140).