Size:1/4" This Control Devices NC25-1UK002 safety valve has a brass body, an adjustable relief pressure, a 1/4" male NPT threaded inlet connection, a silicon O-ring, and a stainless steel pull ring for manual pressure relief. The valve's brass body, brass valve seat, and the stainless steel spring and ball resist corrosion and can be used in operating temperatures up to 250 degrees F. The valve can be adjusted to open between 25 and 200 psi using the knurled adjustment screw and locking jam nut. This safety valve has an 80 standard cubic feet per minute (SCFM) flow rate and is suitable for high temperature pressure relief applications such as in air compressors.Relief valves remove excess pressure or vacuum from a system. The valve openings allow fluids or gases to escape to decrease pressure, and then close once the valve reaches the reseating pressure limit. They also relieve excess vacuum by opening to release a gas into the system and then closing after it reaches its low-pressure limit. Some relief valves have an adjustment mechanism to set the pressure where the valve opens, making it suitable for various applications. Relief valves are rated according to the volume of liquid or gas that can flow through them and the material that the valve is constructed from must be suitable for the fluid or gas, which may be corrosive or at an extreme temperature, in which it operates. Relief valves are used in a variety of applications, such as air compressors, petrochemical and chemical manufacturing, natural gas processing, and power generation.Control Devices manufactures valves and other flow control devices. The company, founded in 1963, is headquartered in Fenton, MO.
E**E
Ajustable Pressure Relief Valve Review
This little PRESSURE RELIEF VALVE was ordered for an RO pressurized system as an extra safety backup in case the water pump pressure switch would fail and the pump would continue building unsafe pressure to the system to the point it would damage the system.There were absolutely no written Instruction in the package from the manufacture!I was lucky enough to have found a reviewer who actually mentioned what the water pressure range each springs represent below:manufacturer instructions:Yellow from 25-50Red from 51-100Silver from 101-150Blue from 151-200I ended up using the red spring, because It' s between the safe range of my water pressure system. The safe range that I needed is beyond 85 PSI for the relief valve to open and release the pressure until It safely got back to 80 PSI once again. To adjust the relief valve:1) There are two nuts on top of it. First among the springs, decide which is the safe range your system should safely operate under.2) Totally unscrew the top and put in the correct color spring intended to be used according to your system3) For instance, I have used the Red Spring. Tightening down the top nut to increase the cut-in range between 51 PSI-100 PSI to where the relief valve will open. I was able to test it on my system until I was able to narrow it down to 85PSI where It would safely open up and release the pressure back to just 80 PSI.I took one star off, because there were no Instruction at all for the little thing!
P**O
"Calibrated" easily using the gauge on the compressor
No issues here! Package included instructions making it clear which spring to use for my application, which is a tankless on-board air compressor in my truck. I installed it between my compressor and quick-release (via T adapter) so that if I inadvertently disconnect the hose from the tire, the hose doesn't burst or damage the compressor. "Calibrated" easily using the gauge on the compressor, and was easy to adjust.I only used the red 51-100 PSI spring, set it to 80 PSI. It popped consistently. It does make a decent amount of noise when it opens (probably sounds like a gunshot to strangers)...I was hoping it'd be more subtle...but it works.
L**.
This worked great for me and I plan to buy more in ...
This worked great for me and I plan to buy more in the future.I bought it to use with a small diaphragm pump which only puts out 5 psi max. Rather than use the supplied springs, I went to Ace hardware and bought a small fine-wired spring (the lightest spring I could find) and cut it to fit the length of the brass housing. With a bit of experimenting and adjusting the setting of the tension, I got it to open at 3 to 4 psi. My point is that this can be used at any psi with the correct spring pressure to control the valve opening.
R**D
Works just fine for my application.
Come with four color coded springs allowing variability of what pop off pressure is desired. You have to play around the with adjustable tension and then tighten the set nut once it has been set were you want the pop off pressure. It is not precise but does the general job. Follow the instruction sheet included. It's stupid simple.
B**T
Great safety valve
It's not a precision valve, but I particularly like that fact in that you can easily adjust it to your needs. I put this on an air line for on board air compressor on my truck that doesn't have an air tank set to ~50 psi to keep the compressor from blowing itself up, tested several times, and it works like a champ.
B**R
Great for old compressors
I have a really really old air compressor, like antique old and the blow off valve that was on it got so weak I couldn't even blow up a car tire to 35psi. This one replaced the old one exactly and came with several springs so I could dial in the pressure the compressor could work at. I would recommend that you start out with the softest spring and work your way up to avoid any damage to your compressor. Mine actually took the 2nd firmest spring and will now pump my portable tank up to 90psi without any trouble. My compressor does not have a tank so it is always pumping so this is a MUST for this style.
P**C
I used the blue spring which was supposed to be good for 150-200
POS. Packaging wasn't sealed. I used the blue spring which was supposed to be good for 150-200. It went off at 75 and 125 while filling the tank. Moved the screw back and forth and allowed me to go up to 150. This thing seems totally unreliable and you have know idea what psi will make it trigger. I used for 2 days until the new one arrived.
R**N
Needs more information
I ordered this and this looks to be what I need, but I have no way of knowing which spring to use (there is a stainless steel color, red, blue, and yellow) and how to calibrate it to the proper pressure. There is no indication or instructions on the package. As a last resort I can hook it up to my air compressor but would it kill them to print a few words of instruction?Update:When I contacted the manufacturer they gave me the instructions that should have been included with the product. Yellow goes from 25-50, Red from 51-100, Silver from 101-150, and Blue from 151-200.
Trustpilot
1 week ago
1 week ago
