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This Control Devices ST25-1A200 ASME safety valve has a brass body, a 200 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 178 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.
Big Steve
August 17, 2025
It works great
L. Landram
May 18, 2025
Good price and quality!
TomT
May 11, 2025
I bought this pressure relief valve to replace the one in my new compressor.I had changed one of the female fittings and broke the manifold. I broke the pressure relief valve trying the change it out. Worked like a charm once the new one was in.No problems.
jesus carreon
May 5, 2025
ðŸ‘
Kenneth P Shaw
April 26, 2025
This is a nice little safety valve that is a must for any pressure vessel. This one will do the job and is within the certification range of my tank. I used this to upgrade my ASME certified tank from 150 psi operating pressure to 175 to match my compressor. This valve will open at 200 psi. It was difficult to remove the old valve from the regulator manifold since the tank manufacturer used blue locking thread sealer to prevent leaks. The body of this type of 1/4" valve is very delicate and needs to be torqued in or out very carefully to avoid breaking it off. I applied a conservative amount of teflon-based sealer and tape to the threads and tightened it just enough to avoid leaks at the operating pressure. Passed the bubble test: no problem with leaks from the threads or valve seat. This one has four holes for releasing air pressure, so the body looks particularly prone to shearing off if turned to aggressively. The one I replaced had two oval release holes and did not survive removal. The hex nut is at the top of the body assembly and all the turning force will pass across the weakest portion of the brass body. Otherwise, a good choice. This is the reason for the 4 star rating.
Rico V
April 22, 2025
It worked like it was supposed to. Keeps me and my project safe.
Informative
March 17, 2025
Works.
Joseph Bartos
January 27, 2025
Good quality
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