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

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.

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.

It relieves a fair amount of pressure. I believe more expensive valves relieve more pressure if that is what you need. Overall, it works pretty cool so far for what I use it for. Ignore the numbers used for measuring on this item. It's only there to make the item more attractive to buy. I had to buy a nut for mine in order to install it, which wasn't very hard. I use mine along with a pressure gauge on a homemade low pressure 55 gal steel sterilizing/pasteurizing drum. I never allow the tank to exceed 2 psi. I use this item basically to begin relieving pressure when the pressure reaches 1-1.5 psi. I adjust it according to my pressure gauge. It is most useful to me really in that it is an alarm for me to turn the propane down or open more wide the main relief valve. And I'm sure it helps prevent the psi from exceeding the point that it is set at. I do believe that if I turned the propane all the way up that this pressure relief valve would not be able to prevent my tank from exceeding the 2 psi that I am able to set it at. This is not a proven fact because I have not tested it. I'm just judging by the amount of pressure that this valve actually relieves. It relieves enough pressure that I don't try to find a better relief valve. But if I wanted to be perfectly safe i would wish for a valve that relieves more pressure so that to be sure that it would be impossible to exceed the 2 psi mark that I can set it at using this valve.

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.

Great device to do pressure fermentation for high pressure lager beers

The PRV that came on my pre-built spunding valve was erratic and I was constantly re-adjusting the valve to manage the pressure on my keg for pressure fermentation. This one is holding much more steadily.

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.