Invention Grant
- Patent Title: Methods and appratus for independently controlling seating forces in rotary valves
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Application No.: US14977104Application Date: 2015-12-21
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Publication No.: US09759340B2Publication Date: 2017-09-12
- Inventor: Andrew John Kinser , Michael Allen Wyatt , Trent Frank Jackson
- Applicant: Fisher Controls International LLC
- Applicant Address: US IA Marshalltown
- Assignee: FISHER CONTROLS INTERNATIONAL LLC
- Current Assignee: FISHER CONTROLS INTERNATIONAL LLC
- Current Assignee Address: US IA Marshalltown
- Agency: Hanley, Flight & Zimmerman, LLC
- Main IPC: F16K17/02
- IPC: F16K17/02 ; F16K1/34 ; F15B15/06 ; F16K31/363 ; F16K1/22

Abstract:
Example methods and apparatus independently control the seating force in a rotary valve. An example apparatus includes a rotary valve having a flow control member and a dual-acting actuator operatively coupled to the rotary valve. The actuator has first and second ports to receive a pressurized control fluid to change a position of the actuator. The example apparatus further includes a valve controller operatively coupled to the actuator to control the pressurized control fluid in response to a position of the rotary valve. The example apparatus further includes a pressure limiter operatively coupled to the valve controller and fluidly coupled to the first port of the actuator. The pressure limiter is to reduce a pressure of the pressurized fluid provided to the first port of the actuator to reduce a seating force of the flow control member when the rotary valve is in a closed position.
Public/Granted literature
- US20170175909A1 METHODS AND APPRATUS FOR INDEPENDENTLY CONTROLLING SEATING FORCES IN ROTARY VALVES Public/Granted day:2017-06-22
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