| 摘要 |
PURPOSE:To monitor the cavitation in a reducing valve by calculating a cavitation coefficient on the basis of water pressure values measured on respective sides of upper stream and downstream of the reducing valve for giving the alarm when the coefficient is under a fixed value. CONSTITUTION:A valve upper stream side water pressure detection pipe 5 is fixed on the upper stream side of a reducing valve 3, while a valve downstream side water pressure detection pipe 6 is fixed on the downstream side. Pressure electric signals 8 and 9 are respectively taken out from these pipes 5 and 6. A cavitation coefficient sigma is calculated by an arithmetic unit 13 in a central monitoring station 17, and this calculated cavitation coefficient sigma is compared with a cavitation limit value sigmav. When sigma<sigmav, it is estimated that there is a cavitation, and a signal of the occurrence of the cavitation is sent to a monitoring panel 14 for lighting an alarm lamp 15 and sounding alarm buzzer 16. |
