Flow regulating valve, flow rate measuring device, flow control device, and flow rate measuring method

Abstract

A fluid regulating valve (11), which has a valve disc (11b), is operably placed in a fluid passage, and can adjust the flow rate of liquid according to the valve opening of the valve disc (11b), characterized in that it includes a A stress detection device (13) for the component of the force in the direction of the fluid passage of the load exerted by the fluid on the valve disk, and a valve opening degree detection device (12) for detecting the opening degree of the valve disk, the flow rate A calculation means (14) calculates a flow velocity (Qm) based on the stress (fm) obtained by the stress detection means, and the valve opening degree (θm) obtained by the valve opening degree detection means. The valve disc drive means (18) are controlled by the control means (15) in accordance with said flow rate in order to open and close the valve disc. This enables the flow rate to be calculated with higher sensitivity and accuracy than the prior art, the structure is compact and simple, and it provides stable data.

Description

technical field [0001] The present invention relates to a flow control valve, a flow velocity measurement device, a flow control device, and a flow velocity measurement method, in particular to a flow velocity measurement technique or a flow control technique, and butterfly valves are preferably used in these techniques. Background technique [0002] In general, butterfly valves are known in which a plate-like valve member, which is formed rotatably relative to its housing, rotates about an axis substantially perpendicular to the direction of the fluid passage. The butterfly valve is manufactured so that it can control its flow rate through the valve opening of the valve member. [0003] A method of measuring a flow rate and a method of controlling a flow rate using the butterfly valve are disclosed in Unexamined Japanese Patent Publication No. Hei-7-174596. In said document, it is disclosed that the dynamic torque of a valve member of the butterfly valve is detected, and t...

AI Technical Summary

Problems solved by technology

However, there is still another problem, that is, there is a limit to the range of flow rates due to the diameter of the hole

In addition, at the pressure measurement point on the downstream side, the turbulence of the fluid generated after the fluid passes through the hole makes the data unstable, and, more specifically, when the pressure difference is high, the detection Data instability is further strengthened

In the worst case, the assay itself may become impossible

In addition, since the orifice flow rate must have two pressure detecting parts on the upstream side and the downstream side, there is a problem that the structure for measuring the flow rate cannot be made compact.

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