Jack Johnson is a fluid power expert, one of the foremost experts in the business. As you may know, Jack writes a monthly article for Hydraulics & Pneumatics and you can read it by clicking here. The answer is really fairly simple, but if it is explained by Jack, you know it is correct.
You can read Jack's articles every month in our digital edition and if you are not currently a subscriber, please advance to the very last page and sign up for your free subscription. We will be happy to send you Jack's expert article and all of the rest of our very informative issues for free.
If you want to dig deeper about proportional valves and servovalves you can do so in the Technologies area of our website in the Valve Section. We also offer two excellent e-books that deal with valves and they can be linked to here.
So, this is a simple question about what is the difference. We offer both the simple and the in-depth answers in our magazine and on our website. I hope that you find this information very useful.