Zhejiang Demelong Fluid Technology Co., Ltd.: Your Professional Inverted Lubricated Plug Valve Manufacturer!
Zhejiang Demelong Fluid Technology Co., Ltd. (DMLV) is a leading industrial valve Manufacturer headquartered in Wenzhou, China. We specialize in the design, development, and production of high‑performance plug valves and flow control solutions for diverse industries such as petrochemical, power generation, wastewater treatment, oil & gas, and industrial fluid systems.
Quality Control
We manage the entire production process, from raw material procurement to final inspection. Each valve undergoes rigorous quality inspection to ensure stable performance, durability, and compliance with international standards.
Customization Available
We support customization based on drawings or samples, meeting non-standard sizes, materials, and coating requirements to suit specific operating conditions.
Advanced Production Equipment
We possess advanced equipment including automatic internal and external cylindrical grinding CNC vertical lathes, CNC machine tools, valve grinding machines, and intelligent universal drive motors.
Wide Range of Applications
Our products are widely used in industries such as petroleum, chemical, natural gas, pharmaceutical, power, and construction.
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Class 600 Lubricated Plug ValveProduct Introduction Class 600 Lubricated Plug Valve, rated up to 1480 psi, provides reliable shut-off and smooth flow control. Lubricated design reduces torque, resists wear and corrosion, and -
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Class 900 Lubricated Plug ValveProduct Introduction The Class 900 Lubricated Plug Valve is built for high-pressure, high-temperature applications. It solves leakage, friction, and wear issues by providing a reliable seal and -
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Class 1500 Lubricated Plug ValveProduct Introduction Class 1500 Lubricated Plug Valve is a high-pressure forged steel valve designed for industrial pipelines. It ensures reliable flow control and tight shutoff for hydrocarbons, -
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Pressure Balance Plug ValveTechnical Specificastion Note: the size of serial valve connecting flange can be designed according to customers' requirement. Pressure Balance Plug Valve: Reliable Control for High-Pressure
An Inverted Lubricated Plug Valve is a quarter-turn shut-off valve designed for reliable isolation in high-pressure and high-temperature pipelines.
As an experienced Inverted Lubricated Plug Valve Manufacturer, we supply valves engineered for oil & gas pipelines, petrochemical plants, refineries, and high-pressure industrial systems.
Specifications
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Structure formation |
BC |
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Driving way |
Hand-operated |
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Electric-actuated |
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Design standard |
API 599 API6D |
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Structure length |
ASME B16.10 |
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Connecting flange |
ASME B16.5 |
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Test and inspection |
API598 API 6D |
Features
Inverted Plug Sealing Design
The inverted installation of the plug changes the sealing direction. Pressure pushes the plug tighter into the seat area, which increases sealing reliability during operation.
Lubrication Injection System
Each valve includes a lubrication channel connected to a sealant injection fitting. The injected lubricant forms a protective film between the plug and seat.
Low Operating Torque
The lubrication system and tapered plug design reduce friction during rotation. Operators can open or close the valve quickly with minimal effort.
Reliable Shut-Off Performance
The plug rotation provides a full metal-to-metal sealing contact. When the valve closes, the lubricant fills microscopic gaps in the sealing surface.
Manufacturing and Inspection Process
A strict inspection procedure ensures every valve meets performance and safety requirements.
Raw Material Verification
All body, plug, and internal components undergo chemical composition and mechanical property testing.
Precision Machining
CNC machining ensures accurate dimensions for the plug taper, sealing surface, and body cavity.
Assembly and Sealant System Installation
Technicians assemble the plug, stem, bearings, and sealant injection system.
Pressure and Leak Testing
Every valve undergoes hydrostatic shell testing and seat leakage testing according to international standards.
Operational Torque Test
The valve is operated through multiple cycles to measure torque stability. This process ensures the lubrication system functions correctly and the valve rotates smoothly.
Final Inspection and Documentation
Each valve receives a final inspection covering dimensions, marking, coating quality, and packaging before shipment.
Pressure and Size Options
Custom valves are available in sizes DN15–DN600 (1/2″–24″) and pressure ratings up to Class 2500.
Special Coatings and Surface Treatments
Anti-corrosion coatings, PTFE lining, or special sealing materials can be added to improve durability in aggressive environments.
Actuation Options
Manual operation, gear operators, pneumatic actuators, or electric actuators can be integrated to suit automated systems.
Certificate
FAQ
Find professional inverted lubricated plug valve manufacturers and suppliers in China here! With abundant experience, we warmly welcome you to buy high quality inverted lubricated plug valve made in China here from our factory. Customized orders are welcome.
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