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    Unbalanced and Balanced Trim

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    Vivi Oktavianti
    There are several types of unbalanced trim designs for control valves including standard full area trim, reduced trim, and integral seat trim, each providing different flow coefficients (Cv). Pressure-balanced trim can be used for high pressure drop applications or large seat diameters to reduce the actuator thrust requirement by decreasing the effective offbalance area, though an over-sized cylinder actuator may be more economical. Pressure-balanced trim should be used in clean services as the closely-fitting plug and sleeve could be impacted by debris otherwise.

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    Unbalanced and Balanced Trim

    Uploaded by

    Vivi Oktavianti
    104 views1 page
    There are several types of unbalanced trim designs for control valves including standard full area trim, reduced trim, and integral seat trim, each providing different flow coefficients (Cv). Pressure-balanced trim can be used for high pressure drop applications or large seat diameters to reduce the actuator thrust requirement by decreasing the effective offbalance area, though an over-sized cylinder actuator may be more economical. Pressure-balanced trim should be used in clean services as the closely-fitting plug and sleeve could be impacted by debris otherwise.

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    Unbalanced and Balanced Trim

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    There are several types of unbalanced trim designs for control valves including standard full area trim, reduced trim, and integral seat trim, each providing different flow coefficients (Cv). Pressure-balanced trim can be used for high pressure drop applications or large seat diameters to reduce the actuator thrust requirement by decreasing the effective offbalance area, though an over-sized cylinder actuator may be more economical. Pressure-balanced trim should be used in clean services as the closely-fitting plug and sleeve could be impacted by debris otherwise.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    104 views1 page

    Unbalanced and Balanced Trim

    Uploaded by

    Vivi Oktavianti
    There are several types of unbalanced trim designs for control valves including standard full area trim, reduced trim, and integral seat trim, each providing different flow coefficients (Cv). Pressure-balanced trim can be used for high pressure drop applications or large seat diameters to reduce the actuator thrust requirement by decreasing the effective offbalance area, though an over-sized cylinder actuator may be more economical. Pressure-balanced trim should be used in clean services as the closely-fitting plug and sleeve could be impacted by debris otherwise.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Trim

    Unbalanced and Pressure-balanced Trim


    Unbalanced Trim Types
    There are various unbalanced trim designs:
    1) standard full area trim which provides maximum Cv with a removable seat ring;
    2) reduced trim which provides a lower Cv in a wide variety of sizes or when larger bodies
    are required;
    3) integral seat trim which utilizes the seat machined into the body and an oversized plug to
    provide additional Cv beyond the capabilities of standard full area trim.
    Pressure-balanced Trim
    Some high pressure drop applications or valves with large seat diameters may require
    pressure-balanced trim. Pressure-balanced trim reduces the actuator thrust requirement by
    reducing the trims effective offbalance area. However, with high-thrust cylinder actuators,
    pressure-balanced trim may not be required. Often, an over-sized cylinder actuator may be
    the most economical choice.
    Because the pressure-balanced plug fits closely to the sleeve (or retainer), the trim should be
    used in relatively clean services.

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