Fabricated/Plastic Insert Venturi Meter (HVT-FI, HVT-PI)
± 0.50% Uncalibrated Uncertainty
Low Loss, Internal / Flange Mounted
- Line Size: 3” to 144”
- Head Loss % of Differential (Venturi): 3.5 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Metal Fabricated and Plastic Insert Venturi Meter (HVT-FI, HVT-PI) for Accurate, Low-Loss Flow Measurement
The PFS insert Venturi meter is engineered for reliable differential pressure flow measurement in clean gases and liquids where low head loss and high accuracy matter. Designed to install between existing pipe flanges, the HVT-FI (metal fabricated insert) and HVT-PI (plastic or fiberglass insert) integrate cleanly into the pipeline while supporting a wide range of line sizes and material requirements.
A key advantage of the insert Venturi is material flexibility. The meter can be custom-fabricated from many machinable materials, including fiberglass, making it a strong fit for corrosive services or installations where metallic materials are not preferred. For large line sizes, static inlet taps and a grouted-in design are available. Digester gas configurations can also be fitted with high and low-pressure tap vent cleaners to help clear buildup on piezometer taps.
Key Advantages & Features:
- Easy Between-Flange Installation: Inserts between flanges, making it a practical solution for new builds or upgrades.
- Low Head Loss: Venturi design keeps pressure loss low compared to many differential pressure devices.
- Long-Term Reliability: No moving parts means fewer failure points, reducing maintenance needs and increasing service life.
- Repeatable, Consistent Performance: Repeatability of plus or minus 0.1% supports stable, repeatable measurement.
- Minimal Installation Effects: No downstream installation effect and minimal upstream effect for easier integration into real piping layouts.
- Material flexibility: Available in fabricated and plastic or fiberglass insert configurations to match challenging service requirements.
- High-Velocity Capability: Well-suited for applications requiring strong performance at higher velocities.
- Scales With Your Needs: Wide turndown capabilities depending on design and instrumentation.
- Flexible Mounting: Mounts in any position to accommodate layout constraints.
The insert Venturi meter is commonly used where teams need accurate, low-maintenance measurement for clean services, including potable water and water treatment processes, wastewater treatment support applications, clean air and gas services, and other clean liquid applications.
Insert HVT Venturi Materials and Applications Comparison
| Insert HVT Venturi, Metallic Fabricated (FI Series) | Insert HVT Venturi, Fiberglass (PI Series) | |
| Construction | Metallic fabricated insert Venturi | Fiberglass insert Venturi option, ideal when non-metal materials are needed |
| Best For | Standard industrial and municipal services where metal construction is preferred | Applications where corrosion resistance or fiberglass construction is preferred |
| Flange-Fit Design | Built to match the pressure and temperature limits of the mating flanges | Built to match the pressure and temperature limits of the mating flanges |
| Service Fit | Ideal for clean gases, steam, and clean liquids | Ideal for clean gases and clean liquids, including refrigerated gases |
| Large Line Options | Static inlet taps and grouted-in design available for large line sizes | Static inlet taps and grouted-in design available for large line sizes |
| Digester Gas Readiness | FIDG models can include high and low-pressure tap vent cleaners to help clear buildup around pressure-sensing taps | FIDG models can include high and low-pressure tap vent cleaners to help reduce buildup around pressure-sensing taps |
| Typical Use Cases | • Air flow for aeration basins and sparge air in water treatment applications • Potable water • Water treatment plants • Wastewater treatment plants • Air, gas, and steam flow | • Aeration basin sparge air flow (most common) • Potable water • Water treatment plants • Wastewater treatment plants • Air and gas, clean liquids, refrigerated gases |
Insert HVT Venturi Specifications
Uncalibrated (2 Sigma): ± 0.50%
Greater can be achieved depending on the specific model and design of the meter, as well as the type of secondary instrumentation system utilized
Insert HVT Venturi Model Types
Model Types
PI Series
- FIFR – Fabricated, Insert, Flanged, Run
- FIG – Fabricated, Insert, Grout-In
- FILF – Fabricated, Insert, Low Flow Meter
- FIDG – Fabricated, Insert, Digester, Gas
- FIW – Fabricated, Insert, Weld-In
- FIF – Fabricated, Insert, Flanged
- FIWR – Fabricated, Insert, Weld-In, Run
FI Series
- FIW – Fabricated, Insert, Weld-In
- FIF – Fabricated, Insert, Flanged
- FIWR – Fabricated, Insert, Weld-In, Run
- FIFR – Fabricated, Insert, Flanged, Run
- FIG – Fabricated, Insert, Grout-In
- FILF – Fabricated, Insert, Low Flow Meter
Fabricated/Plastic Insert Venturi Materials
Common Materials
Fabricated Insert Venturi
- Body: 304SS or Carbon Steel
- Throat: 304 or 316SS
Plastic Insert Venturi
- Body: Fiberglass (FRP)
- Throat: 304 or 316SS, Fiberglass with Stainless, Carbon Steel or Fiberglass
Other Available Materials:
- Aluminum
- Zirconium
- Hastelloy
- Monel
- Duplex SS
- Titanium
- Tantalum
- 321SS
Fabricated/Plastic Insert Venturi 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
Municipal Water & Wastewater Treatment
Used by city utilities to measure clean water flow in treatment and distribution systems, and to support clean services within wastewater plants. The Insert Venturi Meter is a strong fit for raw water, finished water, and process flows, as well as aeration basin and sparge air applications where reliable differential pressure measurement helps stabilize blower control, improve energy efficiency, and keep treatment performance consistent.
Industrial Compressed Air & Plant Utility Gases
Well-suited for industrial facilities measuring clean compressed air and utility gases in manufacturing plants, refineries, and chemical processing sites. Its between-flange installation makes it a practical option for upgrades, while the no-moving-parts design helps reduce maintenance demands in critical utility headers.
Flow Measurement Expertise Since 1983
Field-Proven Solutions, Engineered by PFS
For more than 40 years, Primary Flow Signal has helped municipalities and industrial facilities improve flow measurement with products built for real operating conditions. Our solutions deliver reliable performance across water, wastewater, gas, and process services, with options designed to fit existing infrastructure and simplify upgrades.
Designed for Long-Term Reliability
PFS products are engineered for dependable measurement in demanding conditions. With robust construction and designs that reduce maintenance and failure points, our solutions deliver accurate, repeatable data, long service life, and fewer interruptions for higher uptime and lower total cost of ownership.
Backed by PFS Application Support and Lifecycle Service
Every insert HVT Venturi is supported by PFS specialists who help with sizing, beta selection, instrumentation recommendations, and documentation. From upfront selection through commissioning support and long-term service, you get a partner focused on measurement confidence, uptime, and consistent results.
