Patent ID: 8932030
Filing Date: 2015-01-13
Classification: F04B

Abstract:
1. A piston type pumping apparatus configured for pumping a liquid, comprising: a vertically oriented cylinder having a top and bottom; a first passageway for hydraulic fluid adjacent to the bottom of the vertically oriented cylinder; a second passageway for hydraulic fluid adjacent to the top of the vertically oriented cylinder; a piston reciprocatingly mounted within the vertically oriented cylinder having a top area against which hydraulic fluid acts in a direction of movement of the piston and a bottom area against which hydraulic fluid acts in the direction of movement of the piston; a hollow piston rod connected to the piston and mounted within the vertically oriented cylinder, wherein the hollow piston rod comprises a first one-way valve; a transfer chamber located above the vertically oriented cylinder such that a top portion of the hollow piston rod extends reciprocatingly and sealingly though a first aperture in the top of the vertically oriented cylinder and into the transfer chamber, wherein the first one-way valve is positioned to allow fluid flow from the hollow piston rod into the transfer chamber; a reload chamber located below the vertically oriented cylinder such that a bottom portion of the vertically oriented cylinder extends receiprocatingly and sealingly through a second aperture in the bottom of the vertically oriented cylinder and into the reload chamber; a second one-way valve located in the reload chamber, wherein the second one-way valve is positioned to allow fluid flow into the reload chamber from outside the piston type pumping apparatus; and a discharge chamber located above and in fluid communication with the transfer chamber, wherein the discharge chamber and the transfer chamber are connected by a third one-way valve configured to allow fluid flow from the transfer chamber into the discharge chamber.