Mark 908 Series

The Mark 908 Series regulator was designed specifically to provide accurate blanketing and purge pressure control on very low pressure stainless steel and single use systems. The pilot operated Mark 908 responds to very small changes in tank vessel pressure by throttling open or closed to maintain the desired pressure set point. 

  • All 316L barstock construction
  • FDA and USP Class VI Compliant elastomers and fluoropolymers
  • Accurate regulation down to 1/2” wc (1.25 mbar)
  • ANSI Class VI Shutoff
  • Four available spring ranges
  • 200 psi maximum inlet pressure
  • Five Cv’s; 1, 2, 4, 7.5*, 10*
  • Ultra Lightweight Diaphragm for Maximum Sensitivity

*7.5 Cv and 10 Cv available in 1” size only


  • 3/4” – 1”

End Connections

  • Tri-Clamp™, Tube Weld End, FNPT, Pipe Flanges optional

Body Materials

  • Stainless Steel - ASTM A479 316L
  • Other material available upon request

Diaphragm Material

  • Ultra Lightweight Dupont™ Kapton HN, Polyimide (FDA and USP Class VI compliant)

Service: Tank Blanketing, Purge, SUD bag inflation or integrity testing