Butterfly valve having a function for measuring a flow rate and method of measuring a flow rate with a butterfly valve
First Claim
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1. A butterfly valve having as one function the measurement of a flow rate of a fluid flowing through said butterfly valve, comprising;
- a main body,a valve shaft fixed rotatably to said main body,a valve member fixed to said valve shaft and mounted rotatably in said main body,a valve opening detection means for detecting a valve opening of said butterfly valve,a torque detection means for detecting a dynamic torque applied to said valve member around said valve shaft by said fluid, anda flow rate computation means for computing said flow rate as a predetermined function of said valve opening and said dynamic torque.
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Abstract
A butterfly valve having a function for measuring a flow rate of a fluid flowing through the butterfly valve includes a main body, a valve shaft fixed rotatably to the main body, a valve member fixed to the valve shaft and mounted rotatably in the main body, a valve opening detection device for detecting a valve opening of the butterfly valve, and a torque detection device for detecting a dynamic torque applied to the valve member around the valve shaft by the fluid.
112 Citations
16 Claims
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1. A butterfly valve having as one function the measurement of a flow rate of a fluid flowing through said butterfly valve, comprising;
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a main body, a valve shaft fixed rotatably to said main body, a valve member fixed to said valve shaft and mounted rotatably in said main body, a valve opening detection means for detecting a valve opening of said butterfly valve, a torque detection means for detecting a dynamic torque applied to said valve member around said valve shaft by said fluid, and a flow rate computation means for computing said flow rate as a predetermined function of said valve opening and said dynamic torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring a flow rate of a fluid flowing through a butterfly valve, comprising the steps of;
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detecting a valve opening of said butterfly valve, detecting a dynamic torque applied to a valve member of said butterfly valve around a valve shaft of said butterfly valve by said fluid, and determining said flow rate as a function of said detected valve opening and said detected dynamic torque. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of controlling a flow rate of a fluid flowing through a butterfly valve, comprising the steps of:
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detecting a valve opening of said butterfly valve, detecting a dynamic torque applied to a valve member of said butterfly valve around a valve shaft of said butterfly valve by said fluid, determining said flow rate as a function of said detected valve opening and said detected dynamic torque, setting a desired flow rate, and changing said valve opening such that said determined flow rate approaches said desired flow rate.
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Specification