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
Meticulous cleaning, polishing, and waxing to restore.
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Rich Material Selection
Meticulous cleaning, polishing, and waxing to restore.
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Custom Performance
Meticulous cleaning, polishing, and waxing to restore.
Partner Brands We Offer
Latest News
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![Why Is The Oil And Gas Industry Increasingly Focused On High-performance Plug-in Valves?]()
May 27, 2026Why Is The Oil And Gas Industry Increasingly Focused On High-performance Plug-in Valves?The oil and gas industry is increasingly demanding valve safety With the development of the global energy industry, the operating environment of oil and gas ... -
![What Is A Plug Valve?]()
Oct 30, 2025What Is A Plug Valve?A stopper is a valve that controls the opening, closing, or flow regulation of a fluid channel by rotating the stopper valve. Here are the details: The openi... -
![Ball Valve Operation Precautions]()
Oct 30, 2025Ball Valve Operation PrecautionsBall valve is a key control devices widely used in pipeline systems. Its operation must be carried out in strict accordance with regulations in order to ensu...
