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Ebsray® designs and manufactures a comprehensive program of positive displacement and regenerative turbine pumps for a wide range of industrial applications.

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Ebsray PFM Valve Ebsray PFM Valve Ebsray PFM Valve

RV Series PFM Inline Valves

Ebsray® RV Series Pressure and Flow Modulating (PFM) System Equipment is designed and precision built for applications in pumping systems which demand accurate Constant Pressure Control (CPC) or Flow Modulation/Control. CPC pump systems historically required expensive variable-speed drives, complicated variable displacement pumps and inefficient bypass-type valves. The Ebsray PFM System is a cost-effective alternative that enables constant pressure control from simple input signals with most types and principles of pumps or pumping systems irrespective of changes in viscosity.

Features and Benefits

  • Maintains CPC irrespective of product viscosity or viscosity changes
  • Infinitely adjustable pressure settings from either local or remote stations - manual, automatic or PLC control
  • Control mediums can be pneumatic or hydraulic
  • 90° flanged porting arrangement
  • Smooth, vibration-free and quiet operation

Performance Data

Performance Data RV32 - DN50 RV33 - DN80 RV34 - DN100
Max. Flows 780 L/min (206 gpm) 1,500 L/min (396 gpm) 3000 lL/min (795 gpm)
Max. Working Pressure 18.5 bar (270 psi)
Viscosity Range 1 to 500,000 cSt
Temperature 0°C to 150°C (32°F to 302°F) 

Technical Data

Part Material
Casing Ductile Iron, Steel
Elastomers Nitrile/FKM
Piston Seals PTFE


Installation Operation Manuals (IOMs)