Here are some zero governors I used and I really love them
1. Garretson KN (also Impco KN). Very good one very sensitive to throttle. The only thing I don't like about it is it is second stage only. You have to use other pressure regulator before it. Also it is very big and hard to find spot for it.
Here you can see it on my drilling rig. You can see another regulator attached to it for lowering pressure.
Here is a water pump conversion:
2. Bean T-50. Very good very easy to install. It has high pressure regulator built in so you run high pressure propane directly from your tank. It is very compact and easy to find spot for it.
Here is my skid steer loader Case 1816c conversion:
3. Woodward N-51. It is very similar to Beam 50. Also has high pressure regulator built in.
Here is my lawnmower conversion:
I bought this one used on eBay. Recently I found new ones (Woodward N-51) on eBay for just ....
As soon I saw them I ordered 2 for future projects...... Actually I made them an offer they couldn't refuse....
I have a lot f pictures and I will post each project separately with pictures and info....