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Butterfly valve having a function for measuring a flow rate and method of measuring a flow rate with a butterfly valve

  • US 4,926,903 A
  • Filed: 05/05/1989
  • Issued: 05/22/1990
  • Est. Priority Date: 05/05/1989
  • Status: Expired due to Term
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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