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What Are The Control Valve Seat Leakage Standards? ANSI FCI 70-2 Standard

ANSI FCI 70-2 Standard is a kind of leakage rate standard which for most control valve factory reference during inspection and test pressure.
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    The seat leakage classification of control valves complies with standard ANSI FCI 70-2 superseding ANSI B16.104.

    Maximum Leakage
    Test MediumTest PressureTesting Procedures Required for Establishing Rating
    CLASS INo test is required provided the user and supplier so agree.
    CLASS II0.5% of rated capacityAir or water at 50-125 F (10-52C)45-60 psig or max. operating differential whichever is lowerPressure applied to valve inlet with outlet open to atmosphere or connected to a low head loss measuring device full normal closing thrust provided by the actuator.
    CLASS III0.1% of rated capacityAir or water at 50-125 F (10-52C)45-60 psig or max. operating differential whichever is lowerPressure applied to valve inlet with outlet open to atmosphere or connected to a low head loss measuring device full normal closing thrust provided by the actuator.
    CLASS IV0.01% of rated capacityAir or water at 50-125 F (10-52C)45-60 psig or max. operating differential whichever is lowerPressure applied to valve inlet with outlet open to atmosphere or connected to a low head loss measuring device full normal closing thrust provided by the actuator.
    CLASS V0.0005 ml per minute of water per inch of port diameter per psi differentialWater at 50-125F (10-52C)Max service pressure drop across valve plug, not to exceed ANSI body rating.Pressure applied to valve inlet after filling entire body cavity and connected piping with water and stroking valve plug closed. Use net specified max actuator thrust, but no more, even if available during the test. Allow time for leakage flow to stabilize.
    CLASS VINot to exceed amounts shown in the following table based on port diameter.Air or nitrogen at 50-125 F (10-52C)50 psig or max rated differential pressure across valve plug whichever is lower.The actuator should be adjusted to operating conditions specified with full normal closing thrust applied to the valve plug seat. Allow time for leakage flow to stabilize and use a suitable measuring device.

    Control Valve Seat Leakage Classifications


    *Bubbles per minute as tabulated are a suggested alternative based on a suitable calibrated measuring device, in this case, a 0.25-inch OD X 0.032-inch wall tube submerged in water to a depth of from 1/8 to 1/4 inch. The tube end shall be cut square and smooth with no chamfers or burrs. The tube axis shall be perpendicular to the surface of the water. Other measuring devices may be constructed and the number of bubbles per minute may differ from those shown as long as they correctly indicate the flow in milliliters per minute.

    test 1
    test 1
    test regulators373 400
    test regulators373 400
    hydrualic test
    hydraulic test

    ANSI FCI 70-2 pdf Free Download

    Our file is for non-commercial use, only for study. So if you want it for commercial use, please buy it from Fluid Controls Institute, here is the link for your reference. To learn ANSI FCI 70-2 Control Valve Seat Leakage Standard just freely download it here.

    If you are interested in more videos, please refer to this page.

    Final Thought For ANSI FCI 70-2 Standard

    There are lots of standards for industrial valves, including design and manufacturing, inspection and test standards, face-to-face standards, connection standards, as well as material standards, etc. Basically, a reliable valve manufacturer has its own manufacturing procedure, to guarantee the quality of products. For example, the following is our factory manufacturing procedure.

    industrial valve manufacturing procedure
    the industrial valve manufacturing procedure

    If you are interested in more standards for industrial valves, please refer to this article.

    Picture of Will Don

    Will Don

    After earning my bachelor's degree in mechanical engineering from Zhejiang Normal University in 2008, l was fortunate enough to begin my career with Siemens, Fisher, and YTC, focusing on control valve accessories. Over the past dozen years, l've poured my heart and energy into understanding technology and fluid solutions for control valves.
    Now, as the marketing director for THINKTANK, a trusted branch of the Taiwan STONE valve group, I can't help butf eel proud of how far we've come. Our knowledge isn't just reaching professionals like engineer and valve distributors; it's also inspiring the next generation of automation college students.
    l genuinely hope you're enjoying our articles and finding them helpful.Your thoughts, questions, and feedback mean the world to me, so please don't hesitate to reach out to marketing[at] Whether you're a seasoned expert or just curious about the field, I'm here to connect, share, and learn together.

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    I am the author of this article, and also the CEO and marketing director of THINKTANK, with 15 years of experience in the industrial valve industry. If you have any questions, you can contact me at any time.

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