| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a flow measurement device capable of easily specifying an accurate opening degree of a valve especially at an initial setup such as pipe installation. <P>SOLUTION: A main valve is provided between an upstream pipe and a downstream pipe in an openable/closable state. An opening degree measurement device measures an actual displacement amount of the main valve on the basis of the open/close operation of the main valve. A secondary pressure gauge detects change in pressure of fluid in the downstream pipe when the main valve is opened in a state where the communication between the upstream pipe and the downstream pipe is blocked. The actual displacement amount of the main valve from the state where the communication between the upstream pipe and the downstream pipe is blocked until the secondary pressure gauge detects a predetermined pressure change is stored as a reference displacement amount. When flow is measured, the stored reference displacement amount is subtracted from the actual displacement amount measured by the opening degree measurement device to specify an opening degree of the main valve, and an estimated flow of the fluid in the downstream pipe is calculated on the basis of the opening degree of the main valve. <P>COPYRIGHT: (C)2012,JPO&INPIT |
