The Leader in Flow Measurement Solutions

Primary Flow Signal offers world-class differential pressure flow elements that ensure the highest quality, accuracy and reliability for liquid, gas, and steam applications.

Why PFS?

Looking for Contract Manufacturing?

PFS offers a full-service machining facility with state-of-the-art manufacturing equipment, expert engineering and excellent customer support.

Download our Contract Manufacturing Brochure

PFS is registered with and with DDTC (Directorate of Defense Trade Controls) ITAR (International Traffic in Arms Regulations).

Our Product Lines

See All Products

Venturi Flow Meter

The patented HVT-Halmi Venturi Flow Element designed and perfected by our founder, Dezsoe Halmi, is exclusively available from PFS.

View Venturi Flow Products

Wedgetype Flow Meters

Ideal for asphalt, tar-sands, fracking fluids, spent water, sludge, cement, and other harsh industrial uses.

View Wedgetype Flow Products

Orifice Flow Meters

PFS provides a line of orifice plates, flange unions and orifice meter tubes in full compliance with all applicable standards and codes.

View Orifice Flow Products

PTC 6 / Nozzle Flow Meters

Our PTC-6 flow nozzle enables the precision needed for the testing of steam turbines under the ASME PTC-6 Performance Test Code.

View PTC 6 / Nozzle Flow Products

Flow Accessories

Accessories offered for differential producer flow metering equipment and accessories for measuring liquid, gas and steam flow.

View All Flow Accessories

Specialty Flow Meters

Specialty Meters offered by Primary Flow Signal designed for open-conduit flow for water, sewage, sludge or any other non-pressurized material.

View All Specialty Flow Meters

Our Markets & Applications

See All Markets

Municipal Water & Wastewater

PFS is a global leader in municipal water and wastewater flow measurement.

Learn More

Oil & Gas

PFS offers comprehensive and specialized flow measurement resources to meet the demanding requirements of the oil and gas market.

Learn More

Power Generation

Our accurate, versatile, and rugged flow meters and nozzles are ideal for the power generation industry.

Learn More


PFS provides an innovative industrial product line supported by our industry’s largest team of specialized flow meter engineers.

Learn More


PFS flow meters can help drive increased motor vehicle efficiency and environmental responsibility.

Learn More

Company Overview

Primary Flow Signal has been producing and engineering flow meters for over 30 years, with headquarters and manufacturing in the United States and Canada. With a reputation for reliability, accuracy and customized manufacturing, Primary Flow Signal has emerged as the preeminent industry player in North America.

The PFS Difference