Hartmann - Model AST Series -Trunnion Mounted Ball Valve

• 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

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

DGRL 97/23/EG and API 6D:

• DN 50 – DN 450 (2“ – 18“) to PN 420 (ANSI 2500)
• DN 500 – DN 700 (20“ – 28“) to PN 250 (ANSI 1500)
• DN 1000 (40“) to PN 150 (ANSI 900)
• additional nominal sizes and pressure levels upon request!

API 6A:

• 2 1/16“ – 7 1/16“ to API 10.000
• 9“ – 11“ x 10“ to API 5.000
• 13 5/8“ – 16 3/4″ to API 3.000
• PSL 1 – PSL 3G
• Temp. Class K – Y
• additional nominal sizes and pressure levels upon request!