Control Devices - VR25-100 VR Series Brass Vacuum Relief Valve, 0-30" Hg Vacuum Range, 1/4" Male NPT

I'm working on a program that uses an electronic variable vacuum control. I wanted something to act as a "fail safe" in case the electronic regulator failed and the system was damaged. I was able to set it just above the maximum vacuum the regulator is supposed to allow using this gizmo, which fits the bill perfectly. The valve opens and prevents over (vacuum) pressurizing if the regulator fails to do its job for whatever reason. br>br>Adjusting the pressure is a little fiddly, but as long as you don't need to be super precise, it's simple enough.

Sawyer Molina

| Jul 17, 2021

The first one I was able to connect to a 1/4 inch connection without difficulty, and it held about 28inhg to 29inhg vacuum. I couldn't get anything with a micron count of more than 25,000. I went ahead and installed the second valve after being somewhat satisfied with the first. When I tried to tighten the valve past the rubber to make what I thought was a good seal, the entire valve housing deformed and pinched the adjustment screw, making it nearly impossible to adjust without pliers. The kicker was that I assumed the second valve was defective because I didn't test it before installing it; however, I tested the adjustment on the third valve before installing it and it worked flawlessly. On the bottom of the third valve, there was a lot of rubber. I tried to tighten the valve past the rubber spray on the threads, thinking it was just a bad product, and it not only split the pipe I was screwing the valve into (due to the crappy rubber spray), but it also crushed the valve housing, rendering the once-working adjustment screw useless. br>br>If you have to use these, make sure you burn off the rubber spray and just seal them with a good teflon tape or just lightly hand tighten them. Because the housings are so soft, they were bent with just a medium amount of hand torque. If they took out the rubber and made a heavier-duty version that could handle high vacuum, these things would be perfect. br>br>I am extremely dissatisfied, and if I had known they were so cheaply made, I would have looked for a stainless steel version first. I essentially flushed $15 down the drain.

Otis Johns

| Jun 06, 2021

Because it's a large 1/4" npt, it won't go very far. I assumed it was just the thread sealer getting a little tight, but it was the taper, and I had bent mine before I realized it. br>br> But, thanks to channel locks, I was able to make a minor adjustment and it worked perfectly. I was able to keep my blood pressure at a comfortable 5 inHg. The valve opens slowly at first, just a crack, then more as the vacuum rises to the level you set. br> Since I bent it, I'm going to get a new one, but be careful.

Forrest Young

| Feb 10, 2021

This is great because it allows air to pass so my water barrel doesn't collapse on itself, but with a 1" drain wide open, the air can't keep up, and after about 3 gallons, I can see the barrel slowly collapsing. This isn't a big deal because all I have to do is close the valve slowly to allow the air to catch up.

Finley Sanders

| Dec 01, 2021

There are no complaints because it works.

Marina Carey

| Nov 27, 2021

This was used to relieve pressure in a turbo system's catch can. Well-made unit, but it was difficult to get below 5 psi pressure release, so I cut the spring to get it to work the way I needed it to.

Leila Figueroa

| Jan 25, 2021

Despite the fact that I have no prior experience, this product performs as expected.

Aniyah Brooks

| Oct 16, 2021