Rate of Flow Controller (HVT-FC)
+/- 0.50% Uncalibrated Uncertainty
Low Loss, Control Flow Rate
- Line Size: 4″ to 96″
- Head Loss % of Differential (Venturi): 3.50 – 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Industry-Leading HVT Rate of Flow Controllers
The HVT fabricated Venturi flow Meter delivers precise, reliable flow measurement with broad design flexibility. End arrangements (flanged, threaded, welded, victaulic, The HVT-Halmi Venturi Flow Element in cast iron and ductile iron, offered exclusively by Primary Flow Signal, delivers the highest accuracy and reliability for flow measurement and control of pressurized line fluids—including liquids, gases, high-viscosity fluids, solids-bearing line fluids, and contaminated or harsh applications.
Flow rate control in municipal and industrial processes requires precision, repeatability, and consistency to ensure system integrity. Improper sizing or design of flow control elements can result in increased energy costs, poor process control, or even damage to costly filter beds. Unlike simply installing a meter and valve in series, true optimization requires analyzing the entire flow loop and selecting the right meter–valve combination. For filter effluent and filter backwash rate of flow controller applications, PFS provides a complete System K analysis which plots valve disc position against headloss so as to prevent the valve disc from hunting for the most efficient position.
Rate of flow controllers are engineered to match the unique flow conditions of each system, ensuring maximum efficiency and reliability. They can be designed using any style of HVT Venturi, including the FV, CI, DI, PI, FI, and RV series.
HVT Rate of Flow Controller Key Benefits:
- Optimized Control & Accuracy: Designed as a complete flow loop solution, not just a meter-and-valve pairing, to deliver precise, repeatable flow regulation.
- Durability & Longevity: Venturi-based design with no moving parts, resistant to erosion, and unaffected by downstream piping.
- Clog-Free Reliability: No annular chambers eliminates plugging; suitable for solids-bearing and contaminated flows.
- Versatile Operation: Effective at high velocities, supports turndown ratios of 10:1, 20:1, 50:1+, and can mount in any position.
- Compact Design: Shortened laying lengths available to fit limited space installations.
- Certified for Safety: NSF-61 approved coatings and materials are standard for potable water applications.
Rate of Flow Controller Specifications
Uncalibrated: +/- 0.50 (2 Sigma)
Flow Rate Controller Model Types
Model Types
- HVT-FCC Flow Control Cast Iron HVT Venturi
- HVT-FCD – Flow Control Ductile Iron HVT Venturi
- HVT-FCF – Flow Control Fabricated HVT Venturi
Flow Rate Controller Materials
Common Materials
- Cast Iron or Ductile Iron body
- 304 or 316SS throat
Rate of Flow Controller Certifications
PFS is a contributor to various international standards committees, fully supporting our staff’s memberships to these commissions.
Individual products follow relevant industry regulations, including requirements specific to the oil and gas, water/wastewater, and power generation industries.
PFS maintains the following certifications, standards & compliances:
- ISO 9001
- AGA
- ASME S & U
- API
- ANSI
- European Pressure Equipment Directive (PED)
Applications
Water Treatment Plants
Rate of flow controllers are commonly used for filter effluent regulation and backwash flow control, helping protect filter media, maintain stable flow rates, and support consistent water quality.
Wastewater & Potable Water Systems
These controllers provide accurate influent and effluent flow regulation in wastewater facilities, supporting regulatory compliance and process efficiency. In potable water systems, NSF-61 approved coatings make them suitable for pumping stations, distribution networks, and billing applications.
Industrial & Power Generation
Rate of flow controllers are used in industrial and power applications to stabilize flow in steam systems, cooling water circuits, hydrocarbons, and chemical processing lines—protecting equipment and ensuring reliable operation.
Retrofit & Special Installations
Custom lay lengths allow rate of flow controllers to integrate into existing piping, making them a cost-effective solution for retrofits and special installations without major infrastructure changes.
Industry-Leading Flow Control Expertise Since 1983
Over 40 Years of Flow Control Leadership
For decades, PFS has been a trusted partner in critical flow measurement and control applications. With more than one million HVT Venturi meters installed worldwide, our expertise extends into designing complete rate-of-flow solutions that combine accuracy, efficiency, and long-term reliability.
Integrated Engineering & Lifecycle Support
Our team goes beyond manufacturing by providing end-to-end engineering services tailored to each application. From hydraulic modeling and CFD analysis to flow loop evaluation, calibration, and start-up support, PFS ensures every rate-of-flow controller is optimized for peak performance. Rehabilitation and recertification services further extend product life and maintain accuracy for decades of operation.
Certified Quality & Compliance
All PFS rate-of-flow controllers are built under rigorous quality programs and international standards. We maintain ASME S & U, ISO 9001, and PED certifications, and can supply products with Canadian Registration Numbers (CRN). NSF-61 approved coatings are also available for potable water applications.
