What type of valve is it in the picture?
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I seek the advice of experts here; what type of valve is shown in the picture?
Low flow rate; the shape seems to indicate a needle valve
It is said to be used on vacuum tubes. Is it possible that it’s a diaphragm valve?
This should be called a “throttle valve”.
A needle throttle valve is a type of valve that controls fluid flow by changing the throttling cross-section or throttling length.
It seems to be a throttle stop valve; the diagram isn’t very clear
Diaphragm valve – don’t you see that thick, black line?