Flow Systems

What Flow Systems does

Flow Systems Inc. is a privately held precision flow measurement hardware manufacturer founded in 1986 and headquartered in Berthoud, Colorado, where it operates over 24,000 square feet of office, manufacturing, and testing space including CNC machining, ASME-certified welding, and finishing capabilities. The company designs, manufactures, and integrates flow test systems built around its proprietary Sonic Nozzle (Critical Flow Venturi) technology, which functions as a constant mass-flow reference enabling measurement uncertainties as low as +/-0.13% without requiring differential pressure sensing. Its product portfolio spans aerospace, power generation, automotive, and metrology use cases and includes Sonic Nozzles, Gas Flow Calibrators, Subsonic Meters, Flow Controllers, Flow Computers, Body Leakage Test Stands, HVAC and Mass Air Flow (MAFS) Test Stands, and a range of High, Medium, Low, Mini, Mega, Centrifugal Blower-Based, Portable, and Liquid Fuel/Water Flow Test Systems, all run on customizable Windows-based controller software with remote internet diagnostics.

The company monetizes through enterprise B2B direct sales of capital equipment combined with recurring calibration services delivered under its FSI Calibrations sub-brand, an ISO/IEC 17025-accredited (A2LA) laboratory, and an ISO-accredited, NIST-traceable Field Calibration service that performs annual or semi-annual calibrations at customer sites. Customers are enterprise OEMs, tier-1 suppliers, and metrology laboratories reached through a direct field-sales motion with quote-based, multi-year contract pricing and supplemented by industry trade show participation (NCSLI, Automotive Testing Expo, AeroEngines). The company has installed over 900 test stands in more than 44 countries since inception, employs 30+ people with 300+ years of combined experience, and has no disclosed external funding, parent entity, or institutional ownership.

Name

Flow Systems

Legal name

FlowSystemsInc

Website

https://flowsystemsinc.com

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

11–50 employees

Short description

Flow Systems designs, manufactures, and integrates Sonic Nozzle-based flow test and calibration systems for enterprise customers in aerospace, power generation, automotive, and metrology industries, and supports them with ISO/IEC 17025-accredited lab and on-site calibration services globally.

Ownership category

akta.pro rank

Product category

Flow Measurement and Calibration Equipment

NAICS

Totalizing Fluid Meter and Counting Device Manufacturing (334514), Other Measuring and Controlling Device Manufacturing (334519), Testing Laboratories and Services (541380)

SIC

Totalizing Fluid Meters & Counting Devices (3824), Industrial Instruments For Measurement, Display, And Control (3823), Services-Testing Laboratories (8734)

akta.pro industry

PRIMARYIMAGAFAC

Test & Measurement Equipment (Oscilloscopes, DAQ, signal analyzers, calibration benches)

Industrials, Manufacturing & Construction/Electrical Equipment & Industrial Electronics/Sensors, Instrumentation & Measurement (Industrial sensing, metrology, test)

SECONDARYIMAGAFAH

Calibration Services & Standards (Calibration labs, reference standards, traceability services)

Industrials, Manufacturing & Construction/Electrical Equipment & Industrial Electronics/Sensors, Instrumentation & Measurement (Industrial sensing, metrology, test)

SECONDARYHLAGAIAL

Metrology, Calibration & Testing Equipment (Balances, pH/DO, Standards)

Healthcare & Life Sciences/Life Science Tools & Services (CRO/CDMO/Lab Services)/Laboratory Equipment, Instruments & Consumables

SECONDARYIMABAFAN

Avionics Test, Simulation & Calibration Equipment

Industrials, Manufacturing & Construction/Aerospace & Defense Manufacturing/Avionics, Navigation & Flight Control Systems

Keywords

• Flow measurement equipment
• Flow calibration services
• Sonic nozzle technology
• Aerospace test systems
• Automotive leak testing

Headquarters

HQ city

Berthoud

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Flow Test Equipment Sales: Sale of flow measurement hardware including test stands, sonic nozzles, flow meters, and calibration systems to aerospace, automotive, power generation, and metrology industries. One-time capital equipment purchases with long sales cycles.
2. Calibration Services: ISO/IEC 17025-accredited calibration laboratory services for flowmeters. Includes metrologists, engineers, and technicians providing confidence in results. Over 30+ years of experience.
3. Field Calibration Services: On-site calibration service bringing expertise directly to customer locations. ISO Accredited and NIST Traceable calibration including annual or semi-annual calibration of flow test stands.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels3 records

Core offering

Flow Systems designs, manufactures, and supports precision flow measurement hardware and integrated test systems (sonic nozzles, gas flow calibrators, flow controllers, body leakage and HVAC/MAF test stands, and a family of high/medium/low/mini/mega flow test systems) for aerospace, automotive, power generation, and metrology customers. The company also operates an ISO/IEC 17025 accredited calibration laboratory (FSI Calibrations) and provides on-site field calibration services traceable to NIST.

Product overview

Flow Systems is a precision flow measurement hardware manufacturer offering a comprehensive portfolio of flow testing and calibration products. The company operates under a unified brand with distinct product lines serving Aerospace, Power Generation, Automotive, and Metrology industries. The product portfolio includes Sonic Nozzles (critical flow venturis), Gas Flow Calibrators, Subsonic Meters, Flow Controllers, and Flow Computers as core measurement components. Test systems span multiple platforms: Body Leakage Test Stands and HVAC/MAFS systems for Automotive; High/Medium/Low/Mini/Mega Flow Test Systems and Portable Air Flow Test Systems for Aerospace and Power Generation; and Liquid Fuel Nozzle/Water Flow Test Stands. Supporting services include FSI Calibrations (ISO/IEC 17025-accredited flowmeter calibration) and Field Calibration (on-site, ISO-accredited and NIST-traceable calibration). Products are characterized by Sonic Nozzle technology, Windows-based automation software, and Remote Internet Diagnostics capabilities.

Differentiator

Problem solved

Functional benefit

Brands

• FSI Calibrations: ISO/IEC 17025-accredited calibration laboratory specializing in flowmeter calibration, providing calibration services for a wide range of flowmeters with over 30+ years of experience in flowmeter calibration

Products and services

• Sonic Nozzles Constant volumetric devices also known as critical flow venturis or critical flow nozzles, functioning as state-of-the-art mass meters with internationally recognized standards, excellent repeatability and reproducibility, and constant mass flow with varying downstream pressure. Used across aerospace, automotive, power generation, and metrology industries.
• Gas Flow Calibrators Automated, scalable sonic nozzle test systems available in pressure or vacuum models, supporting testing on 15 different meter types with uncertainties as low as +/-0.13%. Designed for metrology labs and flow meter manufacturers.
• Subsonic Meters Flow measurement devices including Circular Arc Nozzles, ASME Flow Nozzles, and Orifice Meters used for automotive body leakage measurements, turbine engine component measurements, and automotive emissions testing.
• Flow Controller Airflow test measurement and flowrate control solution combining flow measurement, flow control, and logging functionality with a multiple sonic nozzle array, operating as stand-alone or with a PC for remote monitoring.
• Flow Computers Instrumentation for data acquisition, computation, monitoring, and data logging used with multiple sonic nozzles, interchangeable sonic nozzles, or subsonic meters.
• Body Leakage Test Stand – BLTS-175 (2.5 Gen) Automated test stand for measuring airflow leakage through vehicle cabins, enabling automobile manufacturers to improve quality and wind, road, and powertrain noise levels.
• Body Leakage Test Stand – 4th Gen VOW Model Vehicle cabin air leakage test system with highest flow range and highest test pressure range, controlling positive or negative pressure inside the vehicle body during leak testing.
• Body Leakage Test Stand – 4th Gen BIP Model Vehicle cabin leakage test system with quick cycle times, quick mode changes, excellent uncertainty and repeatability, smaller footprint for low to mid-range leakage flows.
• HVAC Test Stand Test system for vehicle HVAC zero pressure testing and blower voltage sweep testing with configurable test schedules and automated measurements.
• MAFS – Mass Air Flow Test System Three levels of mass air flow test systems utilizing Sonic Nozzle technology for accurate, repeatable measurement of air through Mass Air Flow Sensors and induction components.
• High Flow Test System Broad-range air flow testing system with two outlet ports, engineered for aerospace, industrial gas turbine, and power generation applications with best-in-class specifications.
• Medium Flow Test System Mid-range airflow testing system with single 3-inch outlet designed for focused operational needs, providing rapid, accurate, and repeatable results.
• Low Flow Test System Lower-range air flow testing system engineered for large throughput in aircraft component testing with multiple circuit automation and quick-change connections.
• Mini Flow Test System Low-range flow testing system with small footprint for cellular manufacturing, designed for repeatable measurement at lower cost.
• Portable Air Flow Test System (PATS) Transportable airflow metering system employing 1 to 4 automatically selected Sonic Nozzles to meter air flow through units under test, suitable for field measurements.
• Mega Flow Test System Highest maximum air flow rate test system for very large effective area passages in aircraft and land-based turbine engine assemblies using Sonic Nozzle technology.
• Centrifugal Blower-Based System Highest flow rate test system for aircraft and land-based assemblies designed to test turbine engine combustion parts and systems using sub-sonic orifice plate flowmeter technology.
• Liquid Fuel Nozzle Test System / Water Flow Test Stand Turnkey water flow metering system utilizing Coriolis Meter to measure mass flow through units under test, including water storage tank and water pump.
• FSI Calibrations ISO/IEC 17025-accredited calibration laboratory operated by Flow Systems, specializing in calibration of a wide range of flowmeters with over 30+ years of experience and high level of automation.
• Field Calibration Service On-site calibration service bringing expertise directly to customer locations, ISO Accredited and NIST Traceable, including annual or semi-annual calibration of flow test stands covering pressure transducers, temperature sensors, and flow audits.

Quantifiable outcome

• Uncertainties as low as +/-0.13%
• +2 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators3 records

Recent moves6 records

Expansion highlights3 records

Broad incumbents

• Fluke Calibration: Fluke Calibration (division of Fortive/Fluke Corporation) manufactures calibration instruments and references for electrical, temperature, pressure, and flow, serving metrology labs and industrial QA teams globally. It overlaps with Flow Systems' flow calibration and metrology lab products but serves a much broader calibration portfolio.
• MKS Instruments: MKS Instruments supplies precision measurement, control, and monitoring instrumentation including flow and gas analysis products used in semiconductor, industrial, and research markets. It competes in flow measurement instrumentation but at a much larger portfolio scale than Flow Systems.
• Endress+Hauser: Endress+Hauser is a global leader in industrial process measurement instruments, including a wide range of flowmeters and calibration services. Its flow calibration laboratory and reference standards overlap with Flow Systems' calibration offering, while also serving process plant end markets Flow Systems does not target.
• KROHNE Group: KROHNE manufactures industrial flow measurement instruments, including ultrasonic, Coriolis, and variable-area meters, plus calibration services for process industries. It competes with Flow Systems in flow measurement but focuses on process plant end markets rather than aerospace/test-stand verticals.
• Yokogawa Electric: Yokogawa Electric produces industrial flowmeters, control systems, and field calibration instruments across oil & gas, power, and chemical markets. It overlaps with Flow Systems' flow measurement instruments but at a much broader industrial scale.

Direct peers

• Sierra Instruments (McCrometer/IDS): Sierra Instruments manufactures mass flow meters, controllers, and calibrators for gases using thermal and Coriolis principles - similar Sonic-Nozzle-adjacent flow calibration niches. It directly competes with Flow Systems' subsonic and critical-flow venturi calibrators in aerospace/automotive test labs.
• Mesa Laboratories: Mesa Labs provides calibration and measurement solutions including flowmeter calibration services and reference standards through its Bio Pharma and Measurement divisions. It is highly comparable to Flow Systems' FSI Calibrations ISO 17025-accredited flowmeter calibration service line.
• Ceta Test Systems: Ceta Test Systems designs and builds leak test and flow test instruments used in automotive and industrial leak detection. Its body leakage and flow test stand products compete directly with Flow Systems' BLTS family of automotive cabin leakage testers.

Regional players

• Cetoni GmbH (Flow Agent / flow test rigs): Cetoni GmbH (Germany) supplies precision flow test and dosing systems for automotive and laboratory markets in Europe. It is a regional alternative to Flow Systems' body-leakage and HVAC test stands but does not serve the U.S. aerospace and power-generation market directly.

Others

• A2LA (American Association for Laboratory Accreditation): A2LA is the U.S. accreditation body that grants ISO/IEC 17025 accreditation to Flow Systems' FSI Calibrations lab. It is an ecosystem participant/standards authority rather than a competitor, but governs the regulatory moat underpinning Flow Systems' calibration services.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/flow-systems-inc-

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Flow Systems