Neles™ soft seated trunnion ball valve, series 6D

• 3 mm added wall thickness as standard for longevity and enhanced corrosion protection
• Robust cast/forged body and bolting complying with ASME Section VIII div. 1 of pressure vessel code and ASME B16.34 for maximum structural integrity
• Dowel pins and keys provided to avoid bolts being subjected to combined torsional/bending loads in body, stem housing, trunnion, and stuffing box
• Fully machined valve internal surfaces for reduced flow induced frictional losses (fully piggable valve)
• Cavity vent port, bottom drain port, and sealant injection ports in body as standard feature
• Dual body seal with primary O-ring and secondary graphite gasket for excellent performance when subjected to thermal shocks (in-service temperature & pressure excursions, event of fire, etc.)
• One-piece solid mirror finished ball with internal relief hole to avoid cavity over pressurization in valve open condition
• Spring loaded Single Piston Effect (SPE) seat with Double Block and Bleed (DBB) design that absorbs pressure and thermal shocks, wear, and provides a long service life
• DBB seats allows venting of the body cavity in closed position
• Self-relieving Primary Soft Secondary Metal seat (PSSM) design with double barrier O-ring and graphite seal to prevent solids entrapment/accumulation and also provides excellent Fire-Tite^TM  performance
• Nickel alloy (Inconel X-750) helical springs behind seat ensures uniform & consistent seat leak tightness even in low pressure
• Corrosion resistant rugged trunnion secured with pins & low friction bearings ensure precise guiding of ball during valve operation
• Emergency seat and stem sealant injection
• Anti-static arrangement between ball-stem and stem-body (electrical resistance <10 Ω measured using 12V DC source)
• Single piece, internal entry stem, blow-out proof, and precision guided with polymer & graphite thrust washer (for Fire-Tite^TM performance) & internal bushings which handle side loading
• Engineered mounting hardware with high strength coupler & guide bearing for near perfect torque transmission for various types of actuations (including optional compliance to API 6DX)
  
  

Reduced emissions

• Off-center body joint provides

  • Uninterrupted circular O-ring and graphite gasket
  • No bending forces from pipeline to gland packing for lowest emissions
    
    
• Triple barrier stem seal assures long operating life, low emission levels, and online gland packing replacement
  • Internal pressure energized sandwich stem thrust washer (Fluoropolymer + Graphite)
  • O-rings
  • Graphite packing

Standard 6D construction includes,

• Double block and bleed seat (DBB)
• Body bottom drain & cavity vent port on all valves (NPT threads)
• Emergency stem sealant injection provision
• Emergency seat sealant injection provision 
• Body attachments - austenitic stainless steel 316

Typical application includes:

• Hydrocarbons
• Oil & gas (upstream and midstream)
• Pipelines
• Refinery and petrochemical plants
• Renewable energy
• Emergency valves ESD/ ESV/ HIPPS
• Other general process industries