HVT-FC Rate of Flow Controller-1

HVT-FC Rate of Flow Controller

+/- 0.50% Uncalibrated Uncertainty
Low Loss, Control Flow Rate

  • Line size: 4 to 96 inches
  • Head loss % of Differential (Venturi): 3.50 – 10.0 percent
  • Recommended pipe Reynolds number: Greater than 75,000 for basic accuracy


The HVT-Halmi Venturi Flow Element in Cast Iron and Ductile Iron form is offered exclusively by Primary Flow Signal, Inc. for the highest accuracy and reliability for flow measurement of pressurized line fluids, including liquids and gases, as well as high-viscosity line fluids, solids-bearing line fluids, and harsh or contaminated line fluids.

Flow rate control in municipal or industrial transmission and processing scenarios inevitably requires a high degree of precision, repeatability, and accuracy to assure the integrity of the process. Incorrect design and sizing of flow control elements can have far reaching effects that include needlessly incurring increased energy costs, improper process control, or damage or loss of costly filter beds, to name a few.

It is rarely effective or appropriate to simply install a meter and a valve in series and expect properly optimized performance to result. The only way to obtain optimal accuracy and control performance is to properly study the entire flow loop, then select the proper meter valve combination.

The Rate of Flow Controller offers the ability to analyze the unique flow conditions and design the correct flow control solution for the specific demands of any application.

Rate of Flow Controllers can be designed using any style HVT Venturi such as the FVCI, DI PI, FIRV series.


Line Size:
4 to 96 inches. Larger sizes available upon request.
Head loss % of Differential (Venturi):
3.50 to 10.0 percent
Basic Accuracy (% of Total):
+/- 0.25 (Calibrated) +/- 0.50 (2 Sigma) (Uncalibrated)
Minimum pipe Reynolds number:
Must be greater than 75,000
Required Straight Piping:
Consult datasheet for required US & DS piping based on your specific application
Beta Range:
0.30 through 0.75
Useful Service Life:
Very Long
Service Functional Limits:
Clear liquid, gas, contaminated and solid-bearing line fluid
WTP Filter Effluent Rate of Flow Control, Special Lay-lengths to fit existing piping constraints, Potable Water, Water Treatment Plant, Wastewater Treatment Plant
Common Materials:
Cast Iron or Ductile Iron body with 304 or 316SS throat

Support and Service

In addition to a wide range of differential producing Venturi flow meters, orifice plates, WedgeType™ flow meters, and open channel flow elements, PFS provides comprehensive, specialized services for new and existing flow meters, including rehabilitation, hydraulic analysis, and full engineering support.


ISO 9001, ASME S&U, PED Certified, CRN.

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