Ball Valve Type AST

Why do our ball valves have a metal-to-metal sealing system?

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Ball Valve Type AST

Hartmann Valves valves of the AST series are designed for use as high-pressure valves. With our unique and entirely metallic sealing systems they are equally suitable as reliably sealing shut-off valves for liquid as well as gaseous media with solid particle components.

Information sheet Ball Valves
Video: Metallic sealing system
Video: Why ball valves instead of gate valves?
  • Technical characteristics
    • Design according to DGRL 2014/68/EU, API 6D or API 6A
    • Entirely metallic sealing
    • 0-bubble leak rate
    • Two- and three part housings (split body) made of forged material
    • Trunnion-mounted ball
    • Blowout-safe operating spindle
    • Float-mounted, self-centering seat rings with pre-tensioned spring elements
    • Automatic housing pressure relief
    • Sealing force dependent on line pressure
    • Double Block and Bleed (DBB)
    • Exchangeability of upper operating spindle seal at full line pressure
    • No electrostatic charge-up
    • Fire safe according to DIN EN ISO 10497 / API 607
    • Maintenance free
  • Optional Design

    Upon request we manufacture and deliver the ball valves of the AST series for you:

    • with Double Piston Effect (DIB)
    • made of special materials for extreme application areas
    • soft sealing
    • with and without drainage and ventilation connections
    • with purely metallically sealing drainage ball valves
    • as reduced bore ball valves
    • with special interior and exterior coatings
    • for underground use with a shaft extension of up to 6 meters Length
    • with electric, pneumatic, or electro-hydraulic drives
    • fail-safe close or fail-safe open
    • as a special design for your special application case
  • Manufacturing program

    DGRL 2014/68/EU und API 6D:

    • DN 15-300 (1/2″-12″) up to PN 690 (ANSI 4500)
    • DN 40-500 (1 1/2″-20″) up to PN 420 (ANSI 2500)
    • DN 100-700 (4″-28″) up to PN 250 (ANSI 1500)
    • DN 200-900 (8″-36″) up to PN 150 (ANSI 900)
    • DN 1000 (40″) up to PN 100 (ANSI 600)
      further nominal widths and pressure stages on request!


    API 6A:

    • 1 13/16“ – 2 1/16” up to API 10.000
    • PSL 1 – PSL 3G
    • Temp. Class K – Y
      further nominal widths and pressure stages on request!



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