[특허]Valve diagnostic environmental data acquisitioner

Valve diagnostic environmental data acquisitioner 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01M-019/00 G01L-005/00 F16K-037/00
출원번호	US-0334459 (1994-11-04)
발명자 / 주소	McDonald Francis X. (Enfield CT) Siegel Edward A. (West Hartford CT)
출원인 / 주소	Combustion Engineering, Inc. (Windsor CT 02)
인용정보	피인용 횟수 : 39 인용 특허 : 0

초록 ▼

A data acquisition system (1) by which environmental parameters proximate to plant installed valves (2) may be monitored, recorded and correlated with other valve operating data. The system includes sensors (8) for sensing environmental parameters such as gas/vapor concentration, temperature or humidity. The system also includes sensors for sensing changes in the actuating variable (34) and sensors for sensing valve stem displacement (58). The sensors (8, 34, 6) generate electrical signals proportional to the value of the sensed parameter. First data interface equipment (32, 42, 43) is provided for digitizing the sensed actuating variable as the actuating variable is changed to displace the stem, preferably a full stroke from the open-to-close-to-open positions or vice versa. Second data interface equipment (7, 45) is provided for digitizing the sensed environmental parameter as the stem is displaced. Third data interface equipment (6, 45) is provided for digitizing the sensed stem displacement. The digitized data are stored, preferably with a computer (45) and associated random access memory, and can later be uploaded for use in, for example, a plant database system or correlated to evaluate valve operability.

대표청구항 ▼

A system for acquiring characteristic data of a valve proximate a pneumatic valve connected to a fluid line, the valve having a body containing a sealable passage through which line fluid may flow, an operator including a stem for positioning sealing means in the passage, and an actuator for displacing the stem a stroke distance corresponding to the open and closed positions of the sealing means, said system comprising: means for sensing a contaminant vapor concentration while the stem is displaced over the stroke distance; means responsive to the means for sensing a vapor, for generating environmental data commensurate with the magnitude of the sensed vapor concentration; means for sensing stem displacement over the stroke distance; means responsive to the stroke displacement sensing means for generating stem displacement data commensurate with displacement of the stem resulting from a change in operator pressure; first data interface means for digitizing the sensed environmental data; second data interface means for digitizing the stem displacement data; and means for storing the digitized environmental data and stem displacement data. A method of acquiring characteristic data regarding a valve that is connected to a process flow line in a plant, the valve having an actuator, a stem that is displaced in response to a change in the actuating variable, and means responsive to the stem displacement for adjusting the flow through the line, wherein the characteristic data includes environmental data commensurate with contaminant vapor emission from the valve and at least one of actuating variable data or stem displacement data, the method comprising the steps of: acquiring said characteristic data at a plurality of time points during the displacement of the stem; digitizing said characteristic data; recording said characteristic data; and correlating on a common time scale, the environmental data with the at least one of actuating variable data or stem displacement data.

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