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I've used a lot of Dernord products for homebrewing and they've all been generally well built. Same goes for this PRV which is well manufactured. I have not been able to test this yet as my only fermentation tank which can hold 1 bar does not have a 1.5" tri-clamp connection. I got this in anticipation of upgrading to a larger conical for my primary which can support this type of pressure. I like that it's adjustable up to 2 bar and I also like that this valve supports both positive and negative pressure relief to avoid a vacuum. It would be nice if this were adjustable below 1 bar for lower setting but that's not really the intent of this type of PRV so I won't ding it for that.
Overall seems like a solid PRV, I can't test it yet but I tend to think of these types of valves as a fail safe and like I probably wouldn't test a fire extinguisher to review it, I probably wouldn't want to push my tanks to 2.5 bar to test this out.
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