FB5C – Sanitary Back Pressure Regulator

The FB5C Series is available with a hard seat and a variety of diaphragm and o-ring materials, making the valve well-suited for virtually any sterile back pressure application.

The FB5C operates by sensing the inlet pressure, or back pressure, beneath the diaphragm, as flow enters from inlet port on the side. As the back pressure exceeds the setpoint, the diaphragm force compresses the range spring permitting the stem to move from the seat toward the open position. As the flow increases, the back pressure is relieved and the spring and diaphragm relax, allowing the stem to return to the normally closed position. If a different set point is desired, a simple turn of the adjusting screw will increase or decrease the setting to any set point within the range covered by the regulator’s spring.


  • No guiding surfaces in the fluid – prevents particulate generation
  • 100% 316L body and trim
  • Self draining
  • No threads to disassemble for cleaning
  • Clean-in-Place, Steam-in-Place – dome features spring arrangement to allow CIP/SIP


  • 3/4”, 1″, 1-1/2″, 2″, 3″  

End Connections      

  • Sanitary Clamp Ends

Body Material

  • ASTM A351
  • CF3M 316L

Spring Housing Material

  • CF8M cast SST 

Diaphragm Material

  • EPDM/Nylon (to 275°F, 135°C), 3A and FDA only
  • Jorlon (to 400°F, 204°C) – FDA only