Control Devices - CR25-100 -CR25 CR Series Brass Pressure Relief Valve, 0-100 psi Adjustable Pressure Range, 1/4" Male NPT

This is a well built pressure relief with an easy to adjust pressure set point. The scale you see is only a sticker and is questionable at best, but if you have a nice pressure gauge, you can dial in your set point really well. Opening and closing is smooth and quiet with overall functionality being excellent.

Great device to do pressure fermentation for high pressure lager beers

Not very accurate. Had is set around 50 psi and is relieved pressure on the gauge at 15 psi. Additionally there is a sliver of plastic still stuck on the black dial and it makes reading the psi numbers very difficult. Plastic was not completely trimmed. Overall however a nice valve.

I got this to add to my Viair 300 compressor which does not have any auto off switch. When changing tires, you need to be fairly quick about shutting it off at the pump or you risk burning it out. There are options to wire in a pressure switch or you can buy a pump with one built in. For a fraction of the price, I added this to a tee fitting and it works well to bleed off excess pressure without loading the pump. Time will tell, but so far so good.

Very good product for what I am using it for.

The simple design makes it easy to tune for your projects. I have ordered this vale multiple times for different projects.

I put together the spunding valve using this relief valve. It worked perfectly for this application. I had the fermenter at about 6 psi, and the keg pressure set to 4 psi using the valve and it held that pressure for the full 10 gallon transfer into 2 kegs. Don't worry about the comments saying the scale is in accurate, you don't need it. Just set your pressure by watching the gauge as shown in the photos.

I’m using this PRV as part of a pressure fermentation and spunding rig. For my use it works really well with one exception. It needs to be used with a pressure gauge since the gauge on the pressure adjustment is 10-15 psi off. 10 psi on the PRV is actually 15 psi on a gauge.