[특허]Valve positioner with pressure feedback, dynamic correction and diagnostics

Valve positioner with pressure feedback, dynamic correction and diagnostics 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16K-031/126
출원번호	US-0112694 (1993-08-25)
발명자 / 주소	Lenz Gary A. (Eden Prairie MN) Brown Gregory C. (Minnetonka MN) Warrior Jogesh (Chanhassen MN)
출원인 / 주소	Rosemount Inc. (Eden Prairie MN 02)
인용정보	피인용 횟수 : 89 인용 특허 : 0

초록 ▼

In this invention, a valve positioner receives a setpoint from a master and provides a control pressure to a valve actuator for controlling a valve. A sensing circuit in the positioner senses the position of the valve and the control pressure, and a control circuit in the positioner uses both the sensed pressure and position to provide a command output to a pneumatic section which produces the control pressure. In another embodiment of the invention, a positioner receives a setpoint from a master and provides a control pressure to a valve actuator for controlling a valve. A sensing circuit in the positioner senses the valve position and pneumatics in the positioner provide the control pressure as a function of the sensed position and an output from a control circuit within the positioner. The positioner includes a diagnostic circuit which stores a valve attribute and provides a diagnostic output as a function of the stored valve characteristic and a selected one of the sensed variables. In another embodiment of the invention, a positioner includes a correction circuit for storing a valve attribute affected by one of a set of physical parameters and for receiving a selected one of the set of sensed physical parameters. The correction means compensates a command output from a control circuit as a function of the sensed physical parameter and the stored valve characteristic. In another embodiment, the positioner includes a benchset control circuit which ramps the control pressure between an initial control pressure and a final control pressure and back to the initial control pressure, while sampling specific control pressures and their corresponding positions, in order to provide an output indicating the proper spring preload force on an actuator spring.

대표청구항 ▼

A valve positioner for use in a process control system for providing a control pressure to a valve actuator mechanically coupled to a valve, comprising: receiving means coupled to a communications loop for receiving an input representative of a desired valve position; sensing means for providing state variables representative of a process, one state variable representative of the position of the valve and the other representative of the control pressure; transducer means receiving a source of pressurized air and a command output, for providing the control pressure as a function of the command output; control means coupled to the sensing means and the receiving means, for providing the command output as a function of the desired valve position, the sensed position and the time derivative of the sensed pressure; and wherein the time derivative of sensed pressure provides reduced overshoot in the valve position.

이 특허를 인용한 특허 (89)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Valve positioner with pressure feedback, dynamic correction and diagnostics 원문보기

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Valve positioner with pressure feedback, dynamic correction and diagnostics 원문보기

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이 특허를 인용한 특허 (89)

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