# Vortex Flow Meters

> Kármán-vortex measurement for steam, gas and clean liquids. Full-bore vortex-shedding flowmeters for steady, single-phase steam, gas and clean-liquid service, with volumetric output and optional pressure/temperature compensation for inferred mass, standard-volume or energy flow.

## Overview

A bluff body creates alternating Kármán vortices whose shedding frequency is proportional to mean velocity over the validated operating range. Shizhong pairs the primary sensor, electronics, process connection and optional pressure/temperature compensation with the actual medium and duty. Public performance is stated by model, size, fluid, Reynolds number and installation basis; the selection does not transfer one universal accuracy, turndown or straight-run claim across every application.



## Technical specifications

| Parameter | Specification |
|---|---|
| Size range | DN25–DN300 full-bore standard family; larger insertion designs by separate project review |
| Beta ratio | Calibrated meter K-factor in pulses per unit volume, stated on the approved calibration sheet |
| Reynolds-number range | Normal source-family range ReD 2×10⁴–7×10⁶; final low-flow cut-off depends on model, fluid, size and signal quality |
| Pressure taps | None for the vortex primary measurement; optional pressure and temperature sensors support compensated outputs |
| Accuracy | ±0.5% or ±1.0% of reading classes under defined conditions; final guarantee by model, medium, size and calibration basis |
| Turndown ratio | 8:1–16:1 typical source-family range; limited by Reynolds number, velocity, vibration and signal threshold |
| Permanent pressure loss | Low compared with restriction DP meters; exact value depends on body geometry, size, density and velocity |
| Discharge coefficient | Not applicable—vortex meters use a calibrated K-factor rather than a differential-pressure discharge coefficient |
| Temperature range | −40 to +260°C standard family; high-temperature variants up to +400°C by model and remote-electronics arrangement |
| Pressure rating | PN16 / PN25 / PN40 typical; final pressure-temperature rating by approved datasheet and flange code |
| Materials | Stainless-steel wetted body; exact grade, gasket and seal system per approved datasheet |
| Straight-run requirement | Disturbance- and installation-specific under ISO 12764, GB/T 25922 or ASME MFC-6; no universal short-run claim |

## Standards

ISO 12764:2017; GB/T 25922-2023; ASME MFC-6-2013 (R2024); JJG 1029-2007 where Chinese verification applies

## Applications

- Saturated and superheated steam within the selected model envelope
- Industrial gas, compressed air and utility-gas measurement
- Clean water and low-viscosity process liquids
- Boiler-house, district-energy and process energy accounting

## Features

- No moving parts in the flow sensor and low routine mechanical wear
- Frequency signal proportional to flow velocity over the validated range
- Optional pressure and temperature compensation for steam, gas and energy outputs
- Application review for piping disturbance, vibration, pulsation, condensate and two-phase risk

## Contact and source links

- Product page: https://www.shizhongflow.com/products/vortex-flow-meters
- Product catalog API: https://www.shizhongflow.com/api/products
- Selection API: https://www.shizhongflow.com/api/select
- Request an engineering review: https://www.shizhongflow.com/contact
- Email: info@shizhongflow.com
- Phone/WhatsApp: +86-188-0531-6689

Final sizing, materials, pressure-boundary design, calibration and compliance are confirmed against the complete process data sheet and project requirements.