Invention Grant
- Patent Title: Valve positioning system with bleed prevention
- Patent Title (中): 阀门定位系统,防止流血
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Application No.: US13728477Application Date: 2012-12-27
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Publication No.: US09250632B2Publication Date: 2016-02-02
- Inventor: Flavio Tondolo , Roberto Valoti
- Applicant: STI srl
- Applicant Address: IT
- Assignee: STI srl
- Current Assignee: STI srl
- Current Assignee Address: IT
- Agency: Stetina Brunda Garred & Brucker
- Main IPC: F15B19/00
- IPC: F15B19/00 ; G05D7/06 ; F15B20/00 ; F15B5/00

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.
Public/Granted literature
- US20130174915A1 VALVE POSITIONING SYSTEM WITH BLEED PREVENTION Public/Granted day:2013-07-11
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