| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic pressure measurement system for a pneumatic pressure type operation valve capable of performing a safe and easy measurement during its measurement and further capable of attaining measured values accurately with a less amount of variation.SOLUTION: A pneumatic measuring system of a pneumatic pressure type operation valve having a valve body 20 and a valve rod 21. The pneumatic pressure measuring system comprises pneumatic pressure measuring means 35 for measuring pneumatic pressure fed into a pneumatic pressure type operation valve, light volume difference detecting means 42 for irradiating light against the valve rod and receiving light reflected from the valve rod, and starting pneumatic pressure specifying means 33 for specifying pneumatic pressure measured by the pneumatic pressure measuring means when the valve rod starts to move in a case where a difference between the irradiated light volume and reflected light volume detected by light volume difference detecting means is produced equal to or more than a prescribed value.SELECTED DRAWING: Figure 1 |
