Craig G Haroldsen
Engineers in Orem, UT
License number
Utah 164654-2202
Issued Date
Feb 25, 1983
Expiration Date
Mar 31, 2017
Category
Engineer/Land Surveyor
Type
Professional Engineer
Address
Address
Orem, UT
Professional information
Air Over Hydraulics Actuator System
US Patent:
2002003, Mar 14, 2002
Filed:
Jun 21, 2001
Appl. No.:
09/886676
Inventors:
Samuel McKell - Upper Beaconsfield, AU
Craig Haroldsen - Orem UT, US
Laren Winkel - Orem UT, US
Robert Gooch - Orem UT, US
Craig Haroldsen - Orem UT, US
Laren Winkel - Orem UT, US
Robert Gooch - Orem UT, US
International Classification:
F16K031/02
US Classification:
251/129040
Abstract:
A valve actuation system with cooperating pneumatic and hydraulic control features. Compressed pneumatic fluid is generated in a pneumatic fluid supply, and flows in response to requirements between a predetermined command signal and an existing position of a working fluid valve. Hydraulic fluid is pressurized by a pump, and stored within the system by an accumulator. A servo valve comprising a pneumatic fluid flow path and a hydraulic fluid flow path is included to facilitate the flow of hydraulic fluid through the servo valve hydraulic fluid path and a downstream actuator for the working fluid valve in proportion to changes in pneumatic fluid flow through the servo valve pneumatic fluid flow path. A saturated fluid feedback circuit is included to shut off the flow of pneumatic and hydraulic fluid during select periods, such periods typically coincident with static conditions within the actuator of the working fluid valve, thereby reducing pump duty cycle.