for our Powder Processing equipment



Hosokawa Micron has developed the unique Hosokawa ISEM ball segment valve as an in- and outlet valve for mixers and vacuum dryers. This valve is gas, dust and liquid tight, has no flow resistance when opened and is easy to clean and access. The full bore passage, the housing without static pockets and the sealing designs make it the best valve for applications where reliability of the valve sealing is a key issue.

The ISEM valve has proven its reliability under difficult conditions and is a very popular valve for process installations using vacuum or pressure in combination with solvents or toxic materials. The ISEM valve has also been adopted by other machine manufacturers as an addition to their own mixers, dryers and reactors.

The special design of the ISEM ball segment valve impresses with its full passage, its housing without hydrostatic pockets and the various sealing materials available. The ISEM ball segment valve is suitable for a wide variety of processes and systems under pressure conditions as well as under vacuum conditions where disruptions in product processing and cross-contamination must be avoided at all costs.

Thanks to their excellent cleanability, ISEM ball segment valves are very popular with OEMs in various industries such as food, chemical, nuclear, minerals and metals.

  • Charge and discharge valve for mixers, (vacuum) dryers, sterilisation systems, reactors, storage silos and piping for e.g. poisonous, corrosive and flammable products and processes.
  • Pre-dosing valves in packing systems, coarse metering of product flows.
  • Barrier valve in process installations.
  • Flip-flop valves for powder dosing in pressurized systems.
  • Key features
    • Full-bore product opening.
    • Heavy duty design, long operating life time.
    • No static pockets and dead zones where product can store, minimal clearances towards rotating parts possible.
    • Seal access without taking the valve apart.
    • Closable in dynamic product column.
    • Dimensions: available from 75 to ~800 mm, ANSI and DIN.
    • Design pressure: full vacuum to 6 bar(a).
    • Design temperature -20°C / 200°C (higher temperatures on request).
    • Design: ATEX zone 20-22  and 1-2 (powders and gasses).
  • Applications
    • Dry powders
    • Wet powders & filter cakes
    • Pastes
    • Liquids
  • Models

    ISEM ball segment valves are available in several sizes. A number of sizes with their typical characteristics are described below. Please note that these values are indicative only. Detailed information is available on request.

    Size[-]DN 75DN 125DN 150DN 200DN 250DN 300DN 350DN 400
    Length [mm] 200 665 676 709 742 917 943 978
    Width [mm]   442 467 578 643 790 845 938
    Height [mm] 200 205 225 290 325 405 430 470
    Fullbore [mm] 80 132 160 210 260 310 358 405

    Manual operation is available for ISEM valves up to DN 250.

    • All valves are also available with ANSI flanges
    • Over DN 400 on request

    Several different versions are available either in welded or cast execution:

    • Spherical
    • Cylindrical
    • Conical

    Other designs

    On request:
    • Actuator: manual, ISEM lever type, pneumatic / electrical actuators / high torque actuators provided with e.g. position governor.
    • Shape: sanitary design, easy cleaning, droplet shape, angled, double acting single drive, double acting twin drive, single body or welded design, "easy-removable" hinged design, customized designs possible!
    • Heating / cooling: heated/cooled valve housing and or ball segment.
    • Cleaning: manual, CIP, SIP, WIP.
    • Sealing modules: modular sealing system, process sealing static or dynamic (inflatable/retractable) for maximum lifetime and sealing properties.
    • Shaft sealing: lip-seals / o-ring / double sealing with inert gas barrier / leakage detection.
    • Materials of construction: available stainless steel types like AISI 304/316 (L/Ti), alloys etc.
    • Sealing materials: common available elastomers like viton, silicone, EPDM, FFKM and also PTFE, other FDA approved materials etc.

    Test units are available.


To learn more about our powder processing equipment and systems, contact us:



Hosokawa Micron B.V. is certified in accordance with NEN-EN-ISO 14001:2015. This certification requires the implementation of an Environmental Management System consisting of requirements to ensure that all processes related to the environment are routinely identified, assessed and managed. The certification of Hosokawa Micron covers all environmental themes of ISO 14001: air, soil, energy, waste, water, noise and hazardous substances.

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