Christopher D Colwell

US Patent:

6453261, Sep 17, 2002

Filed:

Apr 10, 2001

Appl. No.:

09/832475

Inventors:

Henry Boger - Foxboro MA
Christopher Colwell - Mansfield MA
Peter Levesque - Norwood MA
Larry Schoonover - North Attleboro MA
Raymond Villier - Conde sur Noireau, FR
Denis Vital - Montsecret, FR
Chunhe Zhou - Stoughton MA
James Stares - Norton MA

Assignee:

Dresser, Inc. - Addison TX

International Classification:

G01L 718

US Classification:

702138, 702150

Abstract:

A valve positioner system that includes one or more unique control methods and devices, including several routines to facilitate the continuous maintenance, calibration and adjustment requirements of the valve. The positioner system may utilize pressure and position feedback signals to monitor the valve. The positioner system may utilize an external controller for various diagnostic and other routines. The positioner system can provide automatic positioning and can operate in a manual operating mode or an automatic operating mode. The positioner system can diagnose the valve while the valve process is running or during a maintenance operation. The positioner system can provide nonlinear control of the valve position. The positioner system can self-tune and self-characterize the valve to assure uniform position control. The positioner system can provide valve control through pressure feedback when a position feedback fails or other diagnosed problems.

US Patent:

6745084, Jun 1, 2004

Filed:

Apr 10, 2001

Appl. No.:

09/832403

Inventors:

Henry Boger - Foxboro MA
Christopher Colwell - Mansfield MA
Peter Levesque - Norwood MA
Larry Schoonover - Attleboro MA
Raymond Villier - Conde sur Noireau, FR
Denis Vital - Montsecret, FR
Chunhe Zhou - Stoughton MA
James Stares - Norton MA

Assignee:

Dresser, Inc. - Addison TX

International Classification:

G05D 1600

US Classification:

700 13, 700 28, 700275, 700 72

Abstract:

A valve positioner system that includes one or more unique control methods and devices, including several routines to facilitate the continuous maintenance, calibration and adjustment requirements of the valve. The positioner system may utilize pressure and position feedback signals to monitor the valve. The positioner system may utilize an external controller for various diagnostic and other routines. The positioner system can provide automatic positioning and can operate in a manual operating mode or an automatic operating mode. The positioner system can diagnose the valve while the valve process is running or during a maintenance operation. The positioner system can provide nonlinear control of the valve position. The positioner system can self-tune and self-characterize the valve to assure uniform position control. The positioner system can provide valve control through pressure feedback when a position feedback fails or other diagnosed problems.

US Patent:

20010032518, Oct 25, 2001

Filed:

Apr 10, 2001

Appl. No.:

09/832514

Inventors:

Henry Boger - Foxboro MA, US
Christopher Colwell - Mansfield MA, US
Peter Levesque - Norwood MA, US
Larry Schoonover - North Ahleboro MA, US
Raymond Villier - Conde Sur Noireau, FR
Denis Vital - Montsecret, FR
Chunhe Zhou - Stoughton MA, US
James Stares - Norton MA, US

International Classification:

G01F001/00

US Classification:

073/861000

Abstract:

A valve positioner system that includes one or more unique control methods and devices, including several routines to facilitate the continuous maintenance, calibration and adjustment requirements of the valve. The positioner system may utilize pressure and position feedback signals to monitor the valve. The positioner system may utilize an external controller for various diagnostic and other routines. The positioner system can provide automatic positioning and can operate in a manual operating mode or an automatic operating mode. The positioner system can diagnose the valve while the valve process is running or during a maintenance operation. The positioner system can provide nonlinear control of the valve position. The positioner system can self-tune and self-characterize the valve to assure uniform position control. The positioner system can provide valve control through pressure feedback when a position feedback fails or other diagnosed problems. The positioner system can provide constraints to prevent slope reversal or slope changes in the valve characterization that would produce undesirable valve gain.

US Patent:

62724010, Aug 7, 2001

Filed:

Jul 17, 1998

Appl. No.:

9/118406

Inventors:

Henry Boger - Foxboro MA
Christopher Colwell - Mansfield MA
Peter Levesque - Norwood MA
Larry Schoonover - North Attleboro MA
Raymond Villier - Conde sur Noireau, FR
Denis Vital - Montsecret, FR
Chunhe Zhou - Stoughton MA
James Stares - Norton MA

Assignee:

Dresser Industries, Inc. - Dallas TX

International Classification:

G05D 700

US Classification:

700282

Abstract:

A valve positioner system that includes one or more unique control methods and devices, including several routines to facilitate the continuous maintenance, calibration and adjustment requirements of the valve. The positioner system may utilize pressure and position feedback signals to monitor the valve. The positioner system may utilize an external controller for various diagnostic and other routines. The positioner system can provide automatic positioning and can operate in a manual operating mode or an automatic operating mode. The positioner system can diagnose the valve while the valve process is running or during a maintenance operation. The positioner system can provide nonlinear control of the valve position. The positioner system can self-tune and self-characterize the valve to assure uniform position control. The positioner system can provide valve control through pressure feedback when a position feedback fails or other diagnosed problems.