Mark 688 Series
Piloted Soft Seat Regulators, ANSI Class VI
The Mark 688 Series piloted soft seat regulator is 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.
Features & Benefits
- 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
Sizes: 1″ – 2″ (DN25 – DN50)
Body Material: Carbon Steel, Stainless Steel
End Connection: ANSI Flanges 150/300 #
Cv (Kv): 1″: 17; 1-1/2″: 30; 2″ 45 (DN25: 14,7; DN40 26,0; DN50 38,9)
Max inlet Pressure: 200 psi (13,8 bar)
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