Valve positioning system with bleed prevention
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United States of America Patent
Stats
-
Feb 2, 2016
Grant Date -
Jul 11, 2013
app pub date -
Dec 27, 2012
filing date -
Dec 30, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A valve positioner system with zero bleed at steady state is disclosed. The system has a pilot valve, the operation of which is controlled by an electronic circuit powered from a signaling and power connection of a positioner device. A plurality of pneumatic valves are activated and deactivated by the pilot valve to control a valve actuator. With varying configurations and arrangements of normally open or normally closed pilot valves and pneumatic valves, fail freeze and fail safe operations are contemplated. The activation and deactivation of the pilot valve is controlled by an electronic circuit that monitors a valve position signal.
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