Prisma

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  • 3-8 V-Port Ball Valve with Positioner

  • Standard full or reduced port Ball Valves are unsuitable to use for modulating control due to their large Cv’s and can result in poor control through most of their opening/closing range. However, a V-port or V-notch Ball valve has significantly reduced Cv values and when used in conjunction with an actuator and I/P positioner, can be used as an economically priced control valve for modulating duty.

    Components for modulating assembly are:
    Valve- Apex 3-8T, 3-piece 30° or 60° V-port, 1,000 psi (69 bar) Ball Valve, ISO5211 direct mount, 316ss body/ball/stem, TFM1600 seats, PTFE seals, bsp ends (SW or BW optional)
    Sizes- ½” (DN15) → 2” (DN50)
    Actuator- Prisma PA series DA or SR (if fail open/close required)
    Positioner- YT-1000R (positions in response to 4-20mA signal)
    Piping- Generally ¼” st/steel tube with Hylok tube fittings (nylon tube with plastic fittings optional), Filter Regulator and Pressure Gauges

     



  • Rilsan coating on standard Prisma Actuator

  • The body and end caps of Prisma aluminium actuators are double coated internally & externally (epoxy 20µ applied by cataphoresis + Rilsan 250µ). Cataphoresis is an electrochemical coating process for metallic surfaces, widely used due to its penetration, uniform coating and long service life. Rilsan (nylon 11) is the final coating material, offering these benefits to the standard actuator:-
    • Stability at higher temperatures
    • High impact & abrasion resistance
    • Good resistance to climate extremes (including off shore)
    • Excellent chemical resistance



  • Rilsan coated Aluminium (PA-series)

  • Prisma’s PA series pneumatic actuator is used to operate quarter turn valves such as ball, butterfly and plug valves.

    The features of the standard range of actuators are as follows:
    • Models available in both Double Acting and Spring Return.
    • The smallest actuator is PA-W, through to the largest PA-70
    • Torques from 15.5Nm→4,600Nm (at 5.5 bar)
    • Operated by clean air, water or non aggressive fluid up to 8 bar max.
    • ISO-5211 / Namur
    • Bolt on end caps
    • Safe and easy removal of spring from contained spring packs
    • Can be fitted with limit switches, solenoid valves, positioners
    • Can be fitted with manual override gearbox
    • Stroke adjustment standard in all models (except PA-W).
    • 5.5 bar pressure assumed for sizing/selection

    Refer to the tech sheets for details on each model in the PA series.



  • Plastic- Polyamide (PP-series)

  • Prisma’s PP series can be used to operate quarter turn valves in any material but is frequently used to operate Thermoplastic Valves, due to its corrosion resistant properties.

    The features of the standard range of actuators are as follows:-
    • Models available in both Double Acting and Spring Return.
    • The smallest actuator is PP-W, through to the largest PP-20
    • Torques from 15.5Nm→150Nm (at 5.5 bar)
    • Operated by clean air, water or non aggressive fluid up to 8 bar max.
    • ISO-5211 / Namur
    • Spring caps, held on by coated steel or stainless steel spring clips
    • Can be fitted with limit switches, solenoid valves, positioners
    • Can be fitted with manual override gearbox
    • 5.5 bar pressure assumed for sizing/selection



  • 316SS (NPI-series)

  • Prisma’s NPI series pneumatic actuator is used to operate quarter turn valves such as ball, butterfly and plug valves and is sometimes preferred for additional corrosion protection.

    The features of the standard range of actuators are as follows:
    • Body (CF8M), Shaft (316ss), Bolts (316ss)
    • Models available in both Double Acting and Spring Return.
    • The smallest actuator is NPI-00, through to the largest NPI-40
    • Torques from 22Nm→1,080Nm (at 5.5 bar)
    • Operated by clean air, water or non aggressive fluid up to 8 bar max.
    • ISO-5211 / Namur
    • Bolt on end caps
    • Safe and easy removal of spring from contained spring packs
    • Can be fitted with limit switches, solenoid valves, positioners
    • Can be fitted with manual override gearbox
    • Opening and closing stroke adjustments.
    • 5.5 bar pressure assumed for sizing/selection