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Often the terminology varies from one area to another, to where a question that is asked leaves one scratching their head. I used to run propane tractors and vehicles, and hauled for a dealer for a number of years. It might help if we knew what the injection was to be used on. Some terminology as I learned it.
The inlet side of a regulator is of one pressure, and the regulator lowers it to another pressure on the outlet side. This is done by sort of a needle like valve, that is operated by a diaphragm that has a spring behind it. The spring tension can be adjusted to FINE TUNE the outlet pressure. Those are the basics of a regulator. A solenoid is an electrical device, and when used in LPG set-ups it operates a small plunger to stop/start the flow of fuel, NOT regulate it in any way. On an engine set up, the solenoid shut off is on the high pressure liquid line, before the inlet to the regulator. As to what regulator might work for you, a lot depends upon the capacity or amount of fuel you will need. Will this be used on a small air cooled engine, or a full sized tractor engine running at rated speed? Just like a camper and a commercial building, different sizes of consumption call for different sizes of regulators. The best I can offer is to have you contact a propane dealer, or a propane carburation manfacturing firm. Sorry that I can't help more. There are diesel injection units made for tractors, if that is what you might be interested in.
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