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
  • Technical characteristics
    • Design according to DGRL 97/23/EG, API 6D or API 6A
    • Entirely metallic sealing
    • O-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 API 6 FA and BS 6755/2
    • 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 97/23/EG und API 6D:
    DN 25 – DN 300 (2“ – 12“) bis PN 420 (ANSI 2500)
    further nominal widths and pressure stages on request!

    API 6A:
    1 13/16“ – 7 1/16“ bis API 10.000
    9“ – 11“ x 10“ bis API 5.000
    13 5/8“ – 16 3/4″ bis API 3.000
    PSL 1 – PSL 3G
    Temp. Class K – Y

    further nominal widths and pressure stages on request!


Our sales and design engineers eagerly await your enquiries from the high performance sector. In close collaboration we develop suitable components for your special applications.

Solutions for
extreme areas

Hartmann ball valves and wellheads are designed for pressure classes up to 690 bar, temperatures from -200 to +550°C as well as for high cycle operations and media of all types.

that pays

Durable and low maintenance products reduce the life cycle costs of your plants. This is why we develop, assemble and test exclusively in Germany.

Expertise & consultation
from a single source

You profit from more than 70 years experience during all project phases. We provide you with support, from consulting, development right through to installation and maintenance service.

All references at a glance

Find out which customers use our ball valves successfully.

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