1/4 NPT 175 PSI Air Compressor Relief Safety Valve for Tank

The Control Devices SV-175 ASME safety valve is designed with a durable brass body and is rated for a relief pressure of 175 psi. Featuring a 1/4" male NPT threaded inlet connection, this valve ensures seamless integration into a variety of systems. To facilitate manual pressure relief, it includes a stainless steel pull ring.

Constructed with a brass body, a brass valve seat, and a zinc-plated steel spring, the SV-175 is engineered for exceptional resistance to corrosion. It operates effectively in environments with temperatures reaching up to 250 degrees Fahrenheit. The preset relief pressure is impressively accurate, marked within a tolerance of +/- 3 percent. Additionally, the valve employs a silicon O-ring, which guarantees a leak-proof seal with an accuracy of +/- 10 percent of the relief pressure.

Rated by the American Society of Mechanical Engineers (ASME), this safety valve displays the UV mark indicating its compliance for pressure vessel safety valves. Furthermore, it bears the NB mark, affirming its certification under NB-501, which pertains to the National Board Certification of Pressure Relief Devices.

This safety valve offers a flow rate of 67 Standard Cubic Feet per Minute (SCFM), making it perfect for low-capacity pressure relief applications, such as those encountered in residential construction air compressors. The primary function of relief valves is to alleviate excess pressure or vacuum within a system. They achieve this by permitting fluids or gases to escape, thereby reducing pressure, and then securely closing once the pressure returns to the designated reseating level. Similarly, when relieving excessive vacuum, they open to allow gas into the system and subsequently close after the pressure approaches the defined low-pressure limit.

Some models come equipped with an adjustable mechanism, providing users the flexibility to set the pressure threshold at which the valve will open. This feature makes them versatile for various applications. Relief valves are rated based on their capacity to handle specific volumes of liquid or gas, and it is imperative that the materials used in their construction are appropriate for the types of fluids or gases they will encounter—especially if these substances are corrosive or subjected to extreme temperatures.

Relief valves find utility across a wide array of applications, including air compressors, the petrochemical and chemical manufacturing industries, natural gas processing, and power generation.

Important Note: The 1/4" male NPT threaded inlet connection has an approximate outside diameter of 0.54 inches.

With brass construction paired with a stainless steel spring, this valve not only ensures longevity but also maximizes resistance against corrosion. Its capabilities in high-temperature applications (up to 250 degrees Fahrenheit) and its precise pressure settings exemplify its reliability in critical safety functions. The ASME rating further underscores its quality and compliance with industry standards, promising both functionality and safety for users.

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