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This Control Devices ST25-1A125 ASME safety valve has a brass body, a 125 psi relief pressure, a 1/4" male NPT threaded inlet connection, and a stainless steel pull ring for manual pressure relief. The valve's brass body, brass valve seat, and the zinc plated steel spring resist corrosion and can be used in operating temperatures up to 250 degrees F. The preset relief pressure is accurate to within +/- 3 percent and a silicon O-ring provides a leak-proof seal to within +/- 10 percent of the relief pressure. This safety valve is American Society of Mechanical Engineers (ASME) safety rated and displays the UV mark for pressure vessel safety valves. It also displays the NB mark for certification in accordance with NB-501, National Board Certification of Pressure Relief Devices. This safety valve has a 116 cubic feet per minute (CFM) flow rate and is suitable for low capacity pressure relief applications such as in home construction 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.
T**E
Bad quality control, avoid this product
This product is junk. I ordered several for an air system that has a max pressure of 95 psi. The valves state that there is a tolerance of +/- 10% of the rated pressure so, by my math, it should be good from somewhere around 112.5 psi. All three of the valves that I have ordered blow at below 100 psi. This is definitely a product to avoid, unless you like wasting your time and money.
P**S
Air tight quality fitting.
I hope this review helps you in your shopping. I always read them until I make a decision. This is a great product. It is totally airtight. The spring in it is a little stronger than I would like, but maybe that is what it takes to make it work so well. I just put a larger ring on it for pulling the release and it works fine. Would buy the same one if I needed another.
B**L
Good Productr
Had a mishaps with shipment and got an empty package. Two days later, I received another Safety Valve . Works Great!
S**A
Works fine
What can you say about a safety device. So far I have not encountered any problems with the unit. Works well with evacuating the tank quickly and has a strong spring that keeps the check mechanism in place. The unit is somewhat larger in size from my original device but hasn't created any functional problems.
P**O
Four Stars
It's a little hard to pull the relief valve manually, but otherwise passed my failover tests.
C**N
Fixed the compressor
Replaced this from a leaking one. It's been on the compressor for a year and I've had no problems with it.
A**R
Control Device (Air Compressor Relief Valve)
Safety First! Using the right spec to prevent the air compressor tanks from blowing up. Previous devices would relieve at low pressure causing compressor to run constantly.
K**M
Won’t work
Wrong threads for my tank
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