Tom Lohkamp

US Patent:

20120285554, Nov 15, 2012

Filed:

May 13, 2011

Appl. No.:

13/065356

Inventors:

Tom Lohkamp - Phoenix AZ, US
Bill Stephens - Chandler AZ, US
Martin Gotch - Phoenix AZ, US

International Classification:

F16K 31/02
F04B 49/00

US Classification:

1374875, 13756511

Abstract:

The pumps and pressure controllers described herein aim to pump fluid in two directions, such as from a first port to a second port and vice versa. The pressure controllers aim to control pressure in a system or device, such as a test device, accurately and precisely at a variety of different pressure levels. Generally described, the pumps and pressure controllers described herein may include two or more control valves, which may be actuatable in such a manner so that the pump or pressure controller can switch between operating as a vacuum pump and operating as a compressor. In some embodiments, the pressure controllers may be able to adjust a pressure in the device by small increments thereby providing increased control of the pressure in the device over the prior art. Furthermore, the pressure controllers may be able to control the pressure of a system having low pressure levels.