Mark 688 Series – Piloted Soft Seat Regulator

The Mark 688 Series piloted soft seat regulator was designed specifically to provide accurate pressure control on very low pressure tank blanketing systems. The pilot operated Mark 688 responds to very small changes in tank pressure by throttling open or closed to maintain the desired pressure set point.

  • Accurate regulation down to 1″ wc
  • ANSI Class VI Shutoff
  • Five available spring ranges
  • 200 psi maximum inlet pressure
  • High flows: Cv 1″ 17; 1-1/2″ 25; 2″ 45

Data Sheet
Mark 688 Series Data Sheet

I & M
Mark 688 Series I & M

Overview
Jordan Valve Product Guide
Jordan Valve Product Guide – A4


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