API Lubricated Plug Valve Description
API lubricated plug valve adopts a positive installation of the cone plug, aiming to reduce the friction between the valve body and the plug sealing surface. This type of valve is typically equipped with a seal grease lubrication structure for the valve seat. Through the injection of high-pressure sealing oil via a high-pressure oil nipple, a high-pressure sealing ring is formed around the plug-a layer of oil film between the valve body and the cone plug sealing surface. This serves both as a sealing function and a lubrication function, making the opening and closing process smoother.
Advantages of API lubricated plug valves are mainly reflected in the following aspects:
High-Pressure & Corrosion Resistance: The valve core, made of special alloys or lined materials (e.g., PTFE), can withstand acidic, alkaline, or highly abrasive media.
Low Maintenance Requirements: The lubrication system significantly reduces mechanical wear, extending the valve's service life.
Bidirectional Sealing Capability: Ensures stable sealing regardless of the medium flow direction, making it suitable for complex pipeline systems.
API Lubricated Plug Valve Specification
Size Range: NPS1/2"~40"
Pressure: Class150~2500
Body Material: A105, WCB, LCB, WCC, CF8, CF8M, CF3, CF3M, A890 4A, etc.
Operation: Lever, Gear Box, Electric, Pneumatic, Hydraulic, etc.
Selection Guide
Based on the structural characteristics and functional capabilities of plug valves, the following selection principles are recommended:
For media distribution and flow direction change, with operating temperature ≤300℃, nominal pressure PN≤1.6 MPa, and nominal diameter ≤300 mm, multi-port plug valves are suggested.
For food and pharmaceutical industries (e.g., milk, juice, beer processing equipment and pipelines), austenitic stainless steel clamp-type conical plug valves are recommended.
For oil/gas field operations, pipeline branch lines, and refining/cleaning equipment with nominal pressure class ≤Class 300 and nominal diameter ≤300 mm, oil-sealed conical plug valves are preferred.
For oil/gas field operations, pipeline branch lines, and refining/cleaning equipment with nominal pressure class ≤Class 7500, nominal diameter ≤900 mm, and operating temperature ≤340℃, oil-sealed conical plug valves are advised.
In large-scale chemical plants with corrosive media requiring rapid opening/closing:
For nitrate-based media, PTFE sleeve-sealed conical plug valves are suitable.
For acetate-based media, Cr18Ni12Mo2Ti stainless steel-lined PTFE sleeve-sealed conical plug valves are recommended.
For gas, natural gas, and HVAC systems with nominal diameter ≤200 mm, packed conical plug valves are preferable.
API Lubricated Plug Valve
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