This is one of the most accurate presentation on automatics that I have seen. When you put your thumb over a hose where does the increase in pressure come from? Did the water company see you do it and crank up the pressure. Of course not. What happened is that the reduced flow has reduced friction loss in the hose and so the pressure that was being lost for high flow without thump goes down and that leaves working pressure at the end. The one thing I would say is slightly misstated is that high pump pressure increases reaction force. Not directly. High pump pressure let’s the spring open up delivering more the flow. The higher flow causes the reaction force. Another cool thing about TFT automatics is that they have a turbulence free valve such that the nozzle man can open it op to what they can handle and the pressure will be corrected and the stream will be turbulence free. Nice work
This is one of the most accurate presentation on automatics that I have seen. When you put your thumb over a hose where does the increase in pressure come from? Did the water company see you do it and crank up the pressure. Of course not. What happened is that the reduced flow has reduced friction loss in the hose and so the pressure that was being lost for high flow without thump goes down and that leaves working pressure at the end. The one thing I would say is slightly misstated is that high pump pressure increases reaction force. Not directly. High pump pressure let’s the spring open up delivering more the flow. The higher flow causes the reaction force. Another cool thing about TFT automatics is that they have a turbulence free valve such that the nozzle man can open it op to what they can handle and the pressure will be corrected and the stream will be turbulence free. Nice work