How to know whether the switch of manual butterfly valve is on or off

Question: Hello Bundor! How to know whether the switch of manual butterfly valve is on or off? My manual butterfly valve has been installed on the pipeline and the flow has been cut off in the pipeline, but I can't see whether the manual butterfly valve is open or closed. Can you tell me how to judge whether the switch of manual butterfly valve is on or off?

Bundor valve: There are two operation modes for manual butterfly valve, one is handle operation, also known as handle butterfly valve; the other is turbine driven, also known as turbine butterfly valve.
 
The way to open or close the handle butterfly valve is very simple. Look at the position of the handle. The handle is perpendicular to the pipeline, that means it is closed. If the handle is parallel to the pipeline, it proves that the butterfly valve is now opened.

The turbine butterfly valve is to turn the hand wheel to control the valve switch. We can't judge whether the butterfly valve is on or off through the hand wheel. However, there will be a dial and a pointer at the top of the turbine box, which can clearly tell you what state the butterfly valve is in, namely, on, off, half on and half off.
 
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