US 12,140,033 B2
Valve position control
Camilo Lopez, Export, PA (US); Mark Foltz, Pittsburgh, PA (US); Steve Miller, Pittsburgh, PA (US); Kevin Dowdell, Pittsburgh, PA (US); Mark Wieland, Cranberry, PA (US); and Alan Majors, Pittsburgh, PA (US)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Oct. 26, 2023, as Appl. No. 18/494,907.
Application 18/494,907 is a continuation of application No. 17/092,477, filed on Nov. 9, 2020, granted, now 11,814,964.
Application 17/092,477 is a continuation of application No. PCT/US2019/031447, filed on May 9, 2019.
Claims priority of provisional application 62/669,070, filed on May 9, 2018.
Claims priority of provisional application 62/669,057, filed on May 9, 2018.
Claims priority of provisional application 62/669,048, filed on May 9, 2018.
Claims priority of provisional application 62/669,042, filed on May 9, 2018.
Claims priority of provisional application 62/669,063, filed on May 9, 2018.
Prior Publication US 2024/0102388 A1, Mar. 28, 2024
Int. Cl. F01C 20/28 (2006.01); F01D 17/06 (2006.01); F01D 17/14 (2006.01); F01D 17/26 (2006.01); F01D 21/02 (2006.01); F01K 13/00 (2006.01); F01K 13/02 (2006.01); F02C 7/232 (2006.01); F02C 9/26 (2006.01); F02C 9/28 (2006.01); F02C 9/52 (2006.01); F02C 9/54 (2006.01); F16K 37/00 (2006.01); G01P 21/02 (2006.01); G01R 31/28 (2006.01); H02J 3/38 (2006.01); H02J 3/40 (2006.01)
CPC F01C 20/28 (2013.01) [F01D 17/06 (2013.01); F01D 17/145 (2013.01); F01D 17/26 (2013.01); F01D 21/02 (2013.01); F01K 13/003 (2013.01); F01K 13/02 (2013.01); F02C 7/232 (2013.01); F02C 9/263 (2013.01); F02C 9/28 (2013.01); F02C 9/52 (2013.01); F02C 9/54 (2013.01); F16K 37/0041 (2013.01); F16K 37/0083 (2013.01); G01P 21/02 (2013.01); G01R 31/2829 (2013.01); H02J 3/381 (2013.01); H02J 3/40 (2013.01); F05D 2220/31 (2013.01); F05D 2260/80 (2013.01); F05D 2270/02 (2013.01); F05D 2270/021 (2013.01); F05D 2270/80 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for controlling a turbine valve, comprising:
a hydraulic pilot valve section being moveable in a first direction of the hydraulic pilot valve section from a middle position and moveable in a second direction of the hydraulic pilot valve section from the middle position opposite from the first direction of the hydraulic pilot valve section;
a main hydraulic valve section being moveable in a first direction of the main hydraulic valve section to close the turbine valve when the hydraulic pilot valve section is moved in the first direction of the hydraulic pilot valve section and moveable in a second direction of the main hydraulic valve section to open the turbine valve when the hydraulic pilot valve section is moved in the second direction of the hydraulic pilot valve section;
a position demand indicating a desired position of the turbine valve;
a first feedback indicating an actual position of the hydraulic pilot valve section;
a second feedback indicating an actual position of the main hydraulic valve section;
a pilot valve error determined by a difference between the middle position of the hydraulic pilot valve section and the first feedback;
a main valve error determined by a difference between the position demand and the second feedback;
a turbine valve error determined by combining the pilot valve error and the main valve error; and
a pilot valve adjustment moving the hydraulic pilot valve section in response to the turbine valve error;
wherein the turbine valve error is repeatedly determined and the pilot valve adjustment repeatedly moves the hydraulic pilot valve section to minimize the turbine valve error.