Flow Meters

WELK Meters manufactures industrial flow meters for liquids, steam and gases across pipe sizes DN4 to DN3000. The WKLD electromagnetic flow meter handles conductive liquids — water, wastewater, slurries and chemicals — with PTFE or rubber liners, accuracy to ±0.5% and 4–20 mA/RS-485 outputs in integrated or split versions. The WK-300 ultrasonic flow meter family covers inline, clamp-on and open-channel measurement, letting operators retrofit flow measurement without cutting pipe. Vortex flow meters measure steam and gases in heating and compressed-air systems, while turbine flow meters provide high-accuracy measurement of clean, low-viscosity liquids for batching and fuel systems. All meters are wet-calibrated on our own flow rigs before shipment and ship with calibration records. Typical projects include water utility metering, district heating, irrigation, chemical dosing and energy management. As a factory-direct supplier in Baoding, China, we welcome small MOQ, OEM nameplates and engineering questions — answered within 24 hours.

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  • Oval Gear Flowmeter

    Oval Gear Flowmeter

    Overview The Oval Gear Flowmeter is a type of positive displacement flow meter, known for its high accuracy and reliability. It works by using mechanical measuring elements (oval gears) to continuously divide the fluid into known volumetric segments. By counting the number of times these chambers are filled and emptied, it accurately measures the total…

  • WK-300 Ultrasonic Flow Meter: Inline, Clamp-On, Open-Channel — product photo

    WK-300 Ultrasonic Flow Meter: Inline, Clamp-On, Open-Channel

    • Transit-time ultrasonic flowmeter family: inline (pipe-section), clamp-on and open-channel versions
    • Accuracy better than 1%, repeatability better than 0.2%; 500ms measuring period (128 samples)
    • Inline sizes: flanged DN15-1000 (rated 2.5/1.6/1.0/0.6 MPa by size), union (sanitary) DN25-100
    • Outputs: isolated RS485, OCT pulse, relay, 4-20mA; protocols MODBUS, M-BUS, FUJ extended
    • Inputs: 3× 4-20mA (pressure/level/temperature) + 2× 3-wire PT100; data logging 512 days / 128 months / 10 years
    • Supply isolated DC8~36V or AC85~264V; IP65/IP68
  • WKGB Vortex Flow Meter DN20–DN300

    WKGB Vortex Flow Meter DN20–DN300

    • Karman vortex-shedding flowmeter for liquid, gas and steam, DN20–DN300
    • Accuracy: liquid ±0.5 of reading; gas/steam ±1.0, ±1.5; turndown 1:10 / 1:15
    • Medium temperature -40~+250℃ / -40~+350℃; pressure ratings PN1.6MPa, PN2.5MPa, PN4.0MPa
    • Outputs: pulse 0.1~3000Hz or 4~20mADC 2-wire; supply +12VDC(+24VDC), +24VDC or 3.6V lithium battery (≥5-year, field display type)
    • Temperature & pressure (T&P) compensated versions for steam/gas mass flow
    • ExdIIBT6, IP65, vibration tolerance 1.0g
  • WKGY Liquid Turbine Flow Meter DN4–DN200

    WKGY Liquid Turbine Flow Meter DN4–DN200

    • Liquid turbine flowmeter, DN4~DN200; flow from 0.04-0.25m³/h (DN4) up to 80-800m³/h (DN200)
    • Accuracy ±0.5%R / ±1.0%R; short-term repeatability 0.05%-0.2%
    • Variants: WKGY-N pulse output, WKGY-A 4-20mA 2-wire, WKGY-B battery-powered local display; RS485 / HART options
    • 304 / 316(L) stainless body; medium temperature -20~+120℃
    • Threaded ≤DN40 up to 6.3Mpa; flanged DN50-DN200 up to 2.5Mpa
    • Explosion-proof option ExdIIBT6; signal transmission up to 1000m
  • WKLD Electromagnetic Flow Meter DN10–DN3000

    WKLD Electromagnetic Flow Meter DN10–DN3000

    • Smart magnetic flowmeter for conductive liquids (conductivity ≥5uS/cm), DN10–DN3000
    • Accuracy ±0.3% of reading (DN15–DN600, v≥1m/s); ±0.5% (DN700–DN3000); turndown 1500:1
    • Max velocity 15m/s; pressure ratings up to 4.0MPa standard, 6.3/10MPa special order
    • Liner options PTFE (F4), FEP (F46), PFA, neoprene, polyurethane; 7 electrode materials incl. Hastelloy B/C, Ti, Ta, Pt-Ir
    • Outputs 4-20mA/pulse, RS232C, RS485, HART; supply 220VAC 50Hz or 24VDC
    • Integral, remote, submersible-remote and explosion-proof versions

Flow Meter Selection Guide

No single flow technology fits every duty. WELK Meters manufactures four complementary families: WKLD electromagnetic flow meters (DN10–DN3000, conductive liquids), WKGY turbine meters (DN4–DN200, clean low-viscosity liquids), WKGB vortex meters (DN20–DN300, steam and gases) and WK-300 ultrasonic meters (inline, clamp-on and open-channel).

Matching technology to application

  • Electromagnetic — water, wastewater, slurries and chemicals with conductivity ≥5 µS/cm; accuracy ±0.3% of reading; PTFE/rubber liners and 316L/Hastelloy/Ti electrodes.
  • Turbine — high-accuracy (±0.5%R) custody-style measurement of clean liquids such as diesel and water.
  • Vortex — saturated/superheated steam, compressed air and gases to 350 °C; temperature & pressure compensated versions output mass flow.
  • Ultrasonic — clamp-on retrofits without cutting pipe; inline spool pieces DN15–DN1000; open-channel flumes for discharge monitoring.

Tell us the medium, pipe size, flow range and temperature — our engineers size the right meter and reply within 24 hours.

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