Kenneth Ray James

US Patent:

57977194, Aug 25, 1998

Filed:

Oct 30, 1996

Appl. No.:

8/739893

Inventors:

Kenneth J. James - Newark DE
Brian J. Waibel - Newark DE

Assignee:

Supercritical Fluid Technologies, Inc. - Newark DE

International Classification:

F04B 4900

US Classification:

417 46

Abstract:

A precision high-pressure control assembly for supercritical fluids comprises a continuous flow system having a pressure control loop which includes a source of fluid communicating with a pump. A pressure sensor monitors the pressure of the supercritical fluid in the outlet line of the pump. A pressure controller has an input for receiving a signal relating to the pressure sent by the pressure sensor and the pressure controller yields an electronic output signal to an electropneumatic regulator. A source of air communicates with the electropneumatic regulator to provide pressurized regulated driver air directed to the pump. The electropneumatic regulator controls the regulated driver air pressure of the pump in accordance with the signal received from the pressure controller.

US Patent:

58880500, Mar 30, 1999

Filed:

Aug 25, 1998

Appl. No.:

/139230

Inventors:

Wayne Fitzgerald - Oxford PA
Kenneth J. James - Newark DE
Brian J. Waibel - Newark DE

Assignee:

Supercritical Fluid Technologies, Inc. - Newark DE

International Classification:

F04B 4900

US Classification:

417 46

Abstract:

A precision high-pressure control assembly for supercritical fluids comprises a continuous flow system having a pressure control loop which includes a source of fluid communicating with a piston driven pump. A pressure sensor monitors the pressure of the supercritical fluid in the outlet line of the pump. A pressure controller has an input for receiving a signal relating to the pressure sent by the pressure sensor and the pressure controller yields an electronic output signal to an electropneumatic regulator. A source of air communicates with the electropneumatic regulator to provide pressurized regulated driver air directed to the pump. The electropneumatic regulator controls the regulated driver air pressure of the pump in accordance with the signal received from the pressure controller. The piston head of the pump is in a cryogenic chamber to minimize flash and cavitation.