Neles™ soft seated trunnion ball valve, series 6D

• 3 mm added wall thickness as standard for longevity and enhanced corrosion protection

• Robust body and bolting complying to ASME Section VIII pressure vessel code and ASME B16.34 for maximum structural integrity

• Dowel pins 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 and bottom drain port 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.). Robust spiral wound graphite gaskets for high pressure integrity

• One-piece solid mirror finished ball

• 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-rings/Lip seals and graphite seals for 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 dowel pins & low friction bearings ensure precise guiding of ball during valve operation

• Emergency seat and stem sealant injection options

• Anti-static arrangement between ball-stem and stem-body

• Single piece, internal entry stem, blow-out proof, and precision guided with polymer and graphite thrust washer (for Fire-Tite™ 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)

• Lifting hook and mounting stand for safe lifting and easy handling 

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  
• Multi-layer stem seal assures long operating life, industry leading 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, 

• Class 150 & 300 with 2-piece casting
• Class 600, 900, 1500 with 3-piece forging
• Double block and bleed seat (DBB)
• Body bottom drain & cavity vent port on all valves (NPT threads)
• 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