High torque failsafe valve operator
AssigneeBarksdale, Inc.
InventorsRager Krechmery, Tarig Latif
Life of this patent
Estimating the term…
Abstract
A fluid valve operator for moving a moveable valve element such as a disc (14) that is pressed forcefully against a surface of a valve frame (12). The valve operator includes first and second electric gear reduction motors (22, 24) that each has a movable driving member such as a rack (34, 36) that moves against a handle (20) of the valve element to move the valve element to a connect or disconnect position. Each motor withdraws its driving member from the valve member handle after moving the valve member. A default mechanism (90) moves the valve element handle to a preselected one of the positions, such as the disconnect position, when pressure of a fluid falls below a preselected level.
Claims10
A valve operator for moving a moveable valve element, with respect to a stationary valve frame, between connect and disconnect positions of the valve element, wherein in said connect position said valve element connects a source that supplies a high pressure fluid to a device, and in said disconnect position said valve element does not connect said source of high pressure fluid to said device, comprising:
- first and second energizable gear motors that have respective first and second driving members for moving said valve element, and a control for operating each of said gear motor to move the corresponding driving member from an initial position to an operating position and then immediately thereafter back to said initial position;
- in said operating position of said first driving member said first driving member positions said valve element in said connect position, in said operating position of said second driving member said second driving member positions said valve element in said disconnect position, and in initial positions of said first and second driving members said driving members are each positioned to allow said valve element to be moved between said connect and disconnect positions, whereby said moveable valve element can be moved to a different one of said positions when one of said motors is not energized.
A valve operator for moving a moveable valve element with respect to a stationary valve frame, to move the valve element between connect and disconnect positions of the valve element, wherein in said connect position said valve element connects a source of high pressure fluid to a device that is operated by said high pressure fluid, and in said disconnect position said valve element does not connect said source of high pressure fluid to said device, comprising:
- first and second energizable motor assemblies that have respective first and second driving members for moving said valve element, and a control for operating each of said motor assemblies to move the corresponding driving member from an initial position to an operating position and then thereafter automatically back to said initial position;
- said valve element and driving members are arranged so when said first driving member moves to its operating position said first driving member positions said valve element in said connect position, but when said first driving member moves back to its initial position said first driving member does not change the position of said valve element and is out of the way of movement of said valve member back to its disconnect position, and so when said second driving member moves to its operating position said second driving member positions said valve element in said disconnect position, but when said second driving member moves back to its initial position said second driving member does not change the position of said valve element and lies out of the way of movement of said valve member back to its connect position.
Dependencies are inferred from the claim text.