PRIMARY FLOW SIGNAL, INC.
About
Primary Flow Signal, Inc. (PFS), established in 1983 and based in Cranston, Rhode Island, manufactures differential pressure flow measurement devices for liquid, gas, and steam applications, with particular depth in the municipal water and wastewater sector. The company was founded by Dezsoe Halmi, inventor of the Universal Venturi Tube and the Halmi Venturi Tube, and PFS holds patents on its proprietary venturi designs with over one million Halmi meters installed worldwide. The flagship HVT-Halmi Venturi Flow Element is available in multiple configurations — fabricated models for half-inch through 144-inch lines, cast iron and ductile iron versions for 4-inch through 72-inch lines, and sealed meter systems for highly contaminated wastewater from 6-inch through 96-inch lines. PFS also produces rectangular venturis for open channel applications, classical venturis for clean liquids, wedge-type flow elements engineered for harsh fluids including asphalt, tar-sands, fracking fluids, and sludge, orifice flow meters, and ASME PTC-6 and ISA 1932 flow nozzles for turbine testing and industrial measurement. Supporting products include Flow Master packaged metering systems, differential pressure transmitters, vent cleaners, flow conditioners, butterfly valves, condensate chambers, and fabricated elbow meters. PFS operates an ITAR-registered, Sam.gov-certified manufacturing facility and provides contract manufacturing, meter rehabilitation, laboratory calibration, hydraulic analysis, and computational fluid dynamics modeling. Affiliated companies include Turbines Incorporated, PFS Canada, and Turbines Odessa, serving municipal water, wastewater, power generation, oil and gas, and industrial markets.
Key Products
Differential pressure flow meter for 1/2-inch to 144-inch line sizes in municipal and industrial water and wastewater applications
Cast iron venturi flow meter for 4-inch to 72-inch line sizes suitable for municipal water and wastewater
Ductile iron venturi flow meter for 4-inch to 72-inch lines with enhanced strength and corrosion resistance
Internal and flange-mounted venturi meters for 3-inch to 144-inch lines with installation flexibility
Venturi-based flow rate control device for 4-inch to 96-inch lines that regulates flow through treatment processes
Sealed differential pressure meter for highly contaminated wastewater fluids from 6-inch to 96-inch, preventing clogging and maintenance issues
Standard ISO 5167 venturi tube for clean liquids and gases from 2-inch to 48-inch line sizes
Flow measurement device for rectangular conduits from 3-inch to 144-inch, used in open channel and channel applications
Differential pressure flow measurement element for 1/2-inch to 48-inch line sizes
Orifice plate holders and unions for 1/2-inch to 40-inch lines enabling plate inspection and replacement
Complete orifice meter assemblies with pipe spools, honing available for precision flow measurement
Flow meter for dirty liquids and slurries including sludge and asphalt from 1/2-inch to 30-inch line sizes
Integral manifold wedge meter with replaceable wedge element for 2-inch lines, simplifying maintenance
High-accuracy and high-repeatability flow nozzle for turbine testing from 4-inch to 28-inch lines
Standard long-radius flow nozzle for 2-inch to 24-inch lines per ASME standards
Precision throat tap flow nozzle for 4-inch to 28-inch lines with high accuracy measurement
Standard ISA 1932 flow nozzle for 2-inch to 20-inch lines in industrial flow measurement
Combination venturi and nozzle element for 2.5-inch to 20-inch lines providing accurate differential pressure measurement
Low Reynolds number venturi for small flow measurement from 3/8-inch to 12-inch lines
Elbow-based differential pressure flow meter with no line size limitations, offering low-cost flow measurement
Open channel flow measurement nozzle for 6-inch to 48-inch installations with 25+ year service life
Multi-variable DP transmitters for converting venturi differential pressure to flow rate readings
Tap hole cleaning devices for maintaining venturi meter impulse line accuracy in wastewater applications
Packaged flow metering system with pre-assembled enclosure integrating venturi, transmitter, and accessories
Tube bundle and plate-type flow conditioning elements for establishing uniform flow profiles upstream of meters
Flow control valves for isolation and throttling in metering applications
Resistance temperature detectors for process temperature measurement in flow metering installations
Protective sensor housings for fluid temperature measurement allowing sensor insertion without process isolation
2-inch to 4-inch condensate and seal devices for protecting differential pressure impulse lines in steam and gas applications
Custom fabrication of flow measurement devices and pressure vessels for OEM applications
Refurbishment and restoration of aging flow meters to restore accuracy and extend service life
Certified flow meter calibration services in PFS laboratory facilities
Computational fluid dynamics modeling and hydraulic analysis for flow system design and optimization
Is this your company?
Claim this listing to update your information and feature your products.
Do you know where your next client is? We do.
Violations, consent orders, full historical DMR data, plant details and rankings for every regulated facility — searchable with a smart AI interface.
