Thanks. Glad you found it useful.

No the pressure drop doesn’t increase. That’s where the taper in the flow tube comes into play. Lower part of the flow meter space between bobbin and wall of flowmeter is small. So the five flow causes pressure drop which will counter the effect of gravity. But as flow increase bobbin moves up, the space between bobbin and flow meter increases. So the higher flow still generates the same pressure drop just enough to counter gravity. That’s why the principle on which flowmeter works is called a “variable orifice fixed pressure drop principle”

Thanks for the feedback. These were among the earlier videos. In recent ones have either omitted the music or toned it down significantly.

Hi will try to explain. In old regulators direct acting ones, force of spring s1 and cylinder pressure are the only forces which keeps the valve allowing gas to flow from cylinder to regulator open. SpringS1 used to be adjustable in nature. In a situation where spring S1 was left untightened and flow meter is left open, the gas from cylinder would flow through the regulator in an uncontrolled manner, with no control over the extent of reduction in pressure. In such situation, spring S2 would keep the valve shut preventing gas from flowing from cylinder to regulator. Modern pressure regulators are indirect acting, that is force of spring S1 will oppose entry of gas from cylinder to regulator. And the force is not variable but is fixed. So the newer indirect acting ones do not need a spring S2 at all and it is only of historical significance.

Sorry some technical problems, finding it difficult to prepare in doodly. Might have to be done in power point.

Thanks. If you have any particular topic in mind, please do message will try to make video on that.

Thanks. That was in the early days. Subsequent ones have omitted the music.

Thanks noted. Have avoided adding music in the newer ones.