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Control valve en

  • CFD analysis, flow calculation & testing facilities

    Both design and testing are performed by Dafram qualified engineers using dedicated software and hardware tools. Finite Element Analysis and Computational Fluid Dynamics for both structural and fluid dynamic design validation. Advanced calculation software and hardware allow to predict the valves flow characteristics in terms of pressure drop, flow velocity and risk of cavitation.
    CFD analysis is the primary instrument for the design optimization: pressure and velocity fields are clearly defined at every opening angle, allowing cavitation and noise level numerical prediction.
    Once known the working conditions, the single valve can be designed to perfectly meet the plant requests.

  • Control Ball Valves

  • Flow coefficient evaluation

    High quality measurement equipment allows DAFRAMto collect reliable test data, that ensure a predictable behaviour of the valve in every working condition. Once known the customers’ specification in terms of fluid characteristic, expected flow temperatures, pressure levels and mass flow rates DAFRAMcan develop a control valve that perfectly meets the process configuration.
    Both benches ensure DAFRAMa complete design validation of control valves and an extremely accurate connection between tests and calculation results.

  • Main features

    Due to a very large flow passage DAFRAMcontrol ball valves can grant high flow coefficients compared to other valve types. Thanks to their operating principle, quarter-turn ball valves are able to control fluid flow at very small openings and to open at high differential pressure. They are also able to maintain low fluid velocity thus lower noise and vibration to the pipeline. In addition, control ball valves allow tight and fast shut-off in case of emergency.

    DAFRAMcontrol ball valves assure excellent flow characteristic and provide accurate, reliable control in a wide range of applications, such as chemical, power and oil, both on gas and liquid service.

  • Models overview

    LIGHT SERVICE

    MODELDESIGNSIZESRATINGSAPPLICATION & DESIGN
    LIGHT SERVICE
    Reduced Flow Ball (RFB) Trunnion mounted, reduced bore Up to 48” ANSI 150 to 4500
    API 2000 to 20000
    Basic control capability
    Tight shut-off
    Suitable for low differential pressures
    Hemisphere-molded Ball (HMB) Segmented ball, trunnion mounted Up to 20” ANSI 150 to 2500
    API 2000 to 10000
    Light control capability
    Tight shut-off
    Suitable for low differential pressures
    Unidirectional

    MEDIUM SERVICE

    MODELDESIGNSIZESRATINGSAPPLICATION & DESIGN
    MEDIUM SERVICE
    V-Shaper Ball (VSB) V-port seat, trunnion mounted Up to 48” ANSI 150 to 4500
    API 2000 to 20000
    Good control capability (V shape designed to meet process conditions)
    Tight shut-off
    Fair cavitation resistance
    Unidirectional
    Disk Controller Ball (DCB) Trunnion mounted with drilled disk Up to 20” ANSI 150 to 4500
    API 2000 to 20000
    Good control capability (Drilled disk designed to meet process conditions)
    Tight shut-off
    Moderate cavitation resistance
    Light noise reduction
    Unidirectional
    Vibration control
    Suitable for gas application

    SEVERE SERVICE

    MODELDESIGNSIZESRATINGSAPPLICATION & DESIGN
    SEVERE SERVICE
    Stream Tuner Ball (STB) Multistage ball, trunnion mounted Up to 48” ANSI 150 to 2500
    API 2000 to 10000
    Multistage ball (stage number, hole configuration and general trim design are chosen to meet process conditions; the design is carried out by means of CFD analysis and validated by laboratory measurement)
    Tight shut-off
    Good control capability
    Vibration control
    Good cavitation resistance
    High differential pressure for gas service
    Noise reduction
    Noiseless Ball (NLB) Special multistage ball, trunnion mounted Up to 20” ANSI 150 to 2500
    API 2000 to 10000
    Multistage ball (stage number, hole configuration and general trim design are chosen to meet process conditions; the design is carried out by means of CFD analysis and validated by laboratory measurement)
    Tight shut-off
    Good control capability
    Vibration control
    Excellent cavitation resistance
    High differential pressure for gas service
    Noise reduction

     

    ico pdf Download DAFRAM Control Ball Valves Catalogue

  • Multi-stage ball valves

    DAFRAMmulti-stage ball valves are equipped with an internal cage that splits the pressure drop into several stages. Each stage is made up of a drilled plate placed in the ball hole. The number and configuration of internal stages are defined to meet the working conditions specified by the customer, in order to ensure the best flow control capability.

    Multi-stage ball valves are designed to operate against high pressure drops providing excellent control capability and noise attenuation during a long service life. Furthermore, thanks to DAFRAMproven experience, tight shut-off and zero external leakage are a fixed point.

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