Zhejiang Demelong Fluid Technology Co., Ltd. was established on April 3, 2008. The company specializes in the production and R&D of various plug valves, including pressure boosting plug valves, tracked plug valves, inverted oil seal plug valves, compression accessory plug valves, and eccentric plug valves.
Products Categories
- Sleeve Type Soft Sealing Plug Valve
- Double Block and Bleed Plug Valve
Plug Valve
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Why Choose Us
Demelong focuses on plug valve manufacturing for demanding industrial pipeline systems. We combine practical production experience, precision machining and export-oriented service to provide reliable valve solutions for a wide range of operating conditions.
Our Advantages
Professional plug valve manufacturer
Product range covering multiple plug valve types
API and CE based quality standards
Precision CNC machining and grinding equipment
Custom production for different working conditions
Stable support for international orders
Diverse Designs & Techniques to Meet
Your Custom Needs
You can choose to fulfill your tinplate packaging needs or contact usfor your specific requirements.
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Custom Product Design
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Rich Material Selection
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Custom Performance
Partner Brands We Offer
Latest News
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![What Is API DBB Track Plug Valve?]()
Aug 01, 2026What Is API DBB Track Plug Valve?Pipeline isolation, maintenance and decompression, and prevention of media crossover are the core links to ensure safe production in high-risk industrial pip... -
![The Principle And Main Classification Of Double Sealed Track Plug Valves]()
Jul 22, 2026The Principle And Main Classification Of Double Sealed Track Plug ValvesTwin Seal Orbit Plug Valve is a high performance stopper valve in industrial pipeline systems. It is widely used in high pressure and high-pressure and high ... -
![What Is A Double Sealed Track Plug Valve? What Are The Advantages]()
Jul 16, 2026What Is A Double Sealed Track Plug Valve? What Are The AdvantagesIn petrochemical, natural gas transportation, thermal pipeline, coal chemicals and other high-pressure fluid pipeline systems, the sealing reliability, servi...
