Since 1991 · ISO 5167 differential-pressure flow element manufacturer

Precision flow measurement,
proven in the field

Orifice · Venturi · Nozzle · Wedge · Pitot — designed, machined, inspected and delivered by our own factory.

✔ ISO 9001 · ISO 14001 certified ✔ ISO 5167 · ASME MFC-3M compliant ✔ POSCO stainless steel ✔ Delivered to 15+ countries

Why Daehan Instruments

A Korean manufacturer focused solely on differential-pressure flow meters for 35 years since 1991. No exaggeration — just appropriate technology that fits your site.

📐

Designed to international standards

Designed and calculated to ISO 5167-1~6, ASME MFC-3M / MFC-13M and JIS Z 8762, delivered with test reports and material certificates.

ISO 5167 · ASME MFC · JIS Z 8762
🎯

Verified measurement accuracy

Measurement accuracy of ±0.5% to ±1.5% depending on the product and installation conditions. Expected performance is clearly stated with the flow calculation sheet.

Accuracy ±0.5% ~ ±1.5% (by condition)
🛠️

Custom-built per project

From 15A to 3000A, including special materials and high-temperature / high-pressure specifications — designed to your project requirements and machined and inspected in our own plant.

15A ~ 3000A · special materials available
35+
Years in business
15+
Export Countries
60+
Product Types
24/7
Technical Support

Main Products

We manufacture differential-pressure primary elements following the standard shapes of each ISO 5167 part, plus measurement accessories.

View All Products →
Hwaseong plant · venturi tube production
Machining a large-bore venturi tube on the latheLarge-bore precision machining
Venturi tubes being prepared for shipmentReady for shipment

Designed, machined and inspected in our own plant

Design, precision machining, welding and inspection are all carried out at our plant in Hwaseong, Gyeonggi-do. Because we do not depend on subcontractors, we control delivery and quality directly.

  • ISO 5167 flow calculation sheets and drawings supplied
  • Dimensional, material and pressure inspection as standard; liquid penetrant, tensile and other tests selected per project
  • CMTR, CoC, 3.1 certificates and other quality documents supplied together
  • Proven materials such as POSCO stainless steel
See our quality control

General technical specifications

Representative specifications are shown below; see each product page and catalog for detailed specifications.

Pipe size range15 mm ~ 3,000 mm (15A ~ 3000A)
Pressure ratingJIS 10K ~ 63K · ANSI 150# ~ 2500#
Standard materialSUS304 · SUS316 · SUS316L · carbon steel (CS)
Special materialsMonel · Hastelloy · Inconel · Titanium · PTFE lining
Measurement Accuracy±0.5% ~ ±1.5% (by product and installation conditions)
StandardsISO 5167-1 ~ 6 · ASME MFC-3M / MFC-13M · JIS Z 8762
Pressure tap typesFlange Tap · Corner Tap · D-D/2 Tap · Pipe Tap

High-temperature / high-pressure, corrosive-fluid and special-connection specifications are agreed and confirmed at the quotation stage.

Download Catalog

Download product catalogs and technical documents directly as PDF.

View all catalogs

Applications

Flow measurement solutions trusted across a wide range of industries

View all applications

Send us your project specification and we will reply with a calculation sheet and quotation

Just tell us the pipe size, fluid, pressure / temperature and flow range — we will run the ISO 5167 flow calculation and propose the right product.

✉️ E-mail [email protected] (Sales)
📞 Tel 031-357-8431 (Sales, ext. 1)
📠 Fax +82-31-357-8432
📍 18-21, Muha-ro 36beon-gil, Hwaseong-si, Gyeonggi-do, Korea (18279)