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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.
MATTHEW WALSH
Reviewed in the United States on January 8, 2025
Worked well
Dev
Reviewed in the United States on January 21, 2025
this valve comes with thread paste already applied and is quick and easy to install. this is a good safety valve at a fair price
Ron Harden
Reviewed in the United States on June 11, 2024
Just what I needed.
Waldemar Sawicki
Reviewed in the United States on December 6, 2024
very good product
Hance Smith
Reviewed in the United States on October 10, 2024
Air compressor
Nny
Reviewed in the United States on September 21, 2023
Pros-This has a hardcore spring on it that looks of good quality.-This purges a good amount of air and works very well.Cons-It comes with a very low quality key ring wire that deform easily. Mine came bent up and elongated on the first use-the threads on this have sealant on them and possibly are cut at an angle that seems to put a lot of pressure on threads on air manifolds, mine cracked just by putting it on because it was such a tight fit.I recommend using this on brass and never low quality pot metals
Bob
Reviewed in the United States on October 14, 2023
The safety relief valve on my air compressor went bad and started leaking I purchased this and it has been working well and leak free ever since.NEVER plug a safety relief valve always do replace it with one of the same design and pressure rating that the manufacturer recommends.
Steve Day
Reviewed in the United States on December 4, 2014
The safety valve releases at 115psi, not the 125psi it is rated at. This is the second one I received (a replacement) and it also goes off prematurely like a teenage boy on his first date.
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