Pressure Compensated Flow Control - Part 2 

nothing happens basically. Compensator is responsible for keeping a more or less constant pressure differential over orifice. Orifice equation gives you an idea of how much flow can you get, depending on the pressure differential and orifice opening. Så if you further open needle valve, flow will increase, if you tighten it, it'll decrease. It's simple as that. Of course, if you want to have fine control, this is not a good option.

We've got some information about how we make these simulations here on our website: www.lunchboxsessions.com/help/what-software-do-you-use-to-make-the-simulations

Almost but not quite. The additional weight on the brake shoe/brick stacker is what causes the new, higher load pressure as sensed by the right hand gauge. In a basic needle valve with no p. compensator, the change in pressure differential across the needle would mean that flow rate through valve would decrease. So, in this pressure compensated flow control, the new, higher load pressure together with the spring, moves the compensator spool to set a new, higher pressure on the inlet side of the needle valve, thus holding the flow volume as you say, dead steady - or really close to it. It's a cool valve isn't it? Thanks for writing. -Carl

Thanks. Definitely a very interesting valve. Hat's off to the inventor.