Company Profile

One of the Leading Valve Manufacturers Based in Taiwan.

Found by its parent company, Kenwu Industries Inc., in 1981, John Valve Mfg. Factory Co., Ltd. was established as a professional manufacturing factory that produces valves to serve worldwide.

John-Valve has been one of the leading valve manufacturers based in Taiwan. We have honored the trustworthy reputation worldwide as a specialist in industrial valves.

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years of valve experience

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sales network countries worldwide

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Passionate support for sustainability, Saving energy and reducing emissions

Company Profile

JOHN-VALVE supplies reputable industrial valves widely used in:

The Refinery, Chemical, Petrochemical, Oil & Gas, Oilfield, Marine, Shipbuilding, Mining, Pulp & Paper, Water & Wastewater, Renewable Energy, Hydrogen Pharmaceutical, Biotech, Food & Beverage industries.

Over the past 30 years, we have served in global market projects. Today, we export to over 80 countries throughout the world. Our customers worldwide have responded positively. They have come to rely on our products' high quality, reliable service, and punctual delivery time.

JOHN-VALVE offers a wide range of top-quality valves for the solution of your project.

We specialize in critical environment valve applications in High & Low temperatures, abrasive, and hazard services.

Our products are designed and manufactured according to EN (European Norms), ANSI, JIS, and customized requests.


Our products range
includes the following types:

  • Medium-High Pressure & Temperature Stainless & Carbon Steel Ball Valve.
  • Special Alloy Valve: Duplex, Super Duplex, SMO254, Hastelloy C276, Alloy 20, Monel, 904L, LCC, LCB, Titanium, Nickel Aluminum Bronze.
  • Trunnion Ball Valve: Both Floating & Trunnion available.
  • Forging High-Pressure Ball Valve: PN100, CLASS600, CLASS900, CLASS1500, CLASS2500
  • Double Block & Bleed Ball Valve: CLASS1500.
  • Metal Seated Ball Valve: ANSI/FCI 70-2 Class VI & EN12266-1 Rate A.
  • High-Performance Peek Seats Ball Valve.
  • Fire-Safe Ball Valve: API-6FA,API-607, ISO-10497, BS 6755 certified.
  • API Certified Ball Valve: API-6D certified.
  • ATEX Ball Valve: ATEX 2014/34/EU Confirmation.
  • Cryogenic Ball Valve: BS 6364 Cryogenic Test Certified.
  • Sanitary Ball Valve: with packing material FDA approval. Passivation process upon request.
  • Marine Ball Valve: Lloyd's Register, DNV, Bureau Veritas, various classification societies’ approval.
  • TA-Luft / ISO 15848 Fugitive emissions test approved valve for Hydrogen service
  • Bronze Valve: ASTM B62, UNS C83600, C95800, C84400, EN CC491K, RG5.
  • Transformer Valve
  • Bellow Seal Valve
  • Gate, Globe, Check Valve, Strainer
  • Butterfly Valve
  • Needle Valve
  • Manifold Instrument Valve
  • Cam lock Couplings & Adaptors
  • Pneumatic Actuators
  • Customize Investment Castings & Forging parts
  • Customize Spare parts: Casting parts, Ball, Stem, Handle, Bracket & Adapter.
  • Customize design product
  • Value-added ISO 12944:C3.C4.C5.CX Painting system cooperates with the world's leading paints -JOTUN group.
Contact our Sales team for more information.

We have experience in cooperating successfully with EPC companies worldwide.
Welcome All Global Distribution Network cooperation & project Inquiry!

Company Profile

John-Valve offer the following advantages and reliable credentials:

To maintain production efficiency,customer satisfaction is through continuous quality improvement.

The company's designing and development capability is also demonstrated by the high quality of our products, which have strictly followed the international standardized ISO/API/PED/EN/ASME/ANSI quality assurance system on designing, development, production, installation, and services. In addition, all 3rd party and marine-approved certifications guarantee perfect quality assurance from John-Valve.

  • ISO-9001:2015
  • CE/PED: 2014/68/EU-Module H
  • AD2000-Merkblatt W0
  • PMA
  • EAC Certification: CU-TR 010, CU-TR 032
  • ATEX 2014/34/EU
  • TA-Luft/ISO 15848
  • API-6D
  • API-6FA/API-607/ISO-10497
  • BS 6755
  • BS 6364 Cryogenic Test Certified
  • CRN Certificates includes ten territories and two provinces
  • Marine Classification Societies approved material supplier by Lloyd's Register, DNV, and Bureau Veritas.
  • Service Team: Fast, prompt response to all inquiries and orders
  • Safety Stock: comprehensive inventory in-house to fulfill customers' urgent demand and ensure the punctual delivery
  • Products designed and manufactured according to ANSI, JIS, and EU European standards and customized designs are welcome.
  • Each valve is pressure tested according to API-598 and EN12266-1
  • In-plant Research and Development Department for inventing new innovative features and custom designs

To maintain John-Valve product's high quality

John-Valve has paid close attention to the production process, including designing, casting, processing, assembling, and testing.

In-plant Testing Laboratory Capability :

  • 3D Coordinate Measuring Machine
  • Air & Hydrostatic test
  • Large size valve pressure test up to 48."
  • Chemical Analysis
  • PMI test
  • Tensile & Charpy Impact test
  • Cryogenic test
  • Life Cycle test
  • NDT- Dye Penetration testing and X-Ray testing
  • HVOF Metal Ball & Seats Lapping & Testing
  • High Pressure valves test machine
  • MITUTOYO Roundness Measurement Instrument

In-plant Machine Shop:

  • With computer precision CNC Lathe Machines & Machine Centers for additional milling and machining.
  • During processing quality control plan for machining precision.
  • Fine machined surface roughness according to customers’ request, and even reach high accuracy
  • Two shifts per day to ensure punctual delivery time.

Quality Control Traceability:

  • Works Certificate/ Mill Certificate (EN 10204/3.1) is offered for all of our products
  • 100 % Pressure test quality control before shipment.
  • 100% Torque control for all our valves
  • Heat Treatment process
  • All parts are marked with Heat Numbers for traceability and quality control.
  • Technical Support for our products
  • Fast Replacement of worn parts
  • Long term support: We offer up to 10 years of spare parts availability

John-Valve believes the only way to satisfy our customers is to continuously innovate new products with research and development and increasing our customer service to the top premium level. To be professional in making industrial valves, the company has trained our staff extensively to be knowledgeable in technical aspects about valves.

We have worked hard to create valve markets by meeting customers' demands and constantly advancing our knowledge of valves. For us, the function of valves is not only an on/off switch, but it also provides room for creativity and aesthetics in the process of delicate design. As a result, the design of our products has proven to be highly marketable and structurally durable.

The core value of John-Valve is:

"To Be a Highly Efficient Organization, Giving the Best Possible Service and Delivering the Best Quality Products Solution in a Fast Reliable Delivery Time."

We provide the highest quality products and services to support global projects. With your support, John-Valve will continue to ensure excellence in the industry.

Get in Touch

John-Valve, your professional and reliable valve partner.
For more information & reference, please consult with our sales team.