Inverted Pressure Balance Lubricated Plug Valve Description
The inverted pressure-balanced lubricated plug valve is a valve that combines the inverted valve core design with the pressure balance + grease lubrication system. It achieves low operating torque, bidirectional zero leakage and high pressure resistance through the sealing grease injection and the balance hole structure. It is specially used in harsh working conditions of high-risk media such as oil and natural gas.
Inverted valve core: The plug is installed inverted, and the valve body sealing surface and the plug cone surface are precisely ground (surface roughness ≤Ra0.8) to improve the sealing reliability.
Pressure balance hole: Balance holes and check valves are set at both ends of the plug to balance the axial thrust of the medium pressure on the valve plug and reduce the opening and closing resistance.
Grease lubrication system: An oil groove is set between the valve body sealing surfaces, and sealing grease (such as high-temperature resistant silicone grease) is regularly injected through the grease injection port to form a dynamic oil film lubrication and enhance the sealing effect.
Inverted Pressure Balance Lubricated Plug Valve specification
| Terms | Specification |
|---|---|
| Nominal diameter | NPS ½–36(DN15–900) |
| Pressure Level | Class 150–2500(PN20–420) |
| Applicable temperature | -29℃~180℃(Conventional Grease) |
| Leak Level | API 598(Zero leakage) |
Advantages:
Low operating torque: The pressure balance design reduces the opening and closing torque by more than 40%, which is suitable for large-diameter high-pressure pipelines; Wear and corrosion resistance: The surface of the plug is nitrided, nickel-phosphorus alloy or supersonic sprayed hard alloy (surface hardness ≥HRC58), which can withstand the erosion of particle-containing media; Bidirectional sealing: Grease fills the sealing gap to achieve bidirectional zero leakage and meet the strict sealing requirements of natural gas pipelines.
Application and selection points
Application: Emergency shut-off of long-distance natural gas pipelines and station control systems; Pressure regulation and isolation of sulfur-containing crude oil and corrosive media in petrochemicals; Fluid on-off control of high-temperature steam or power systems.
Selection suggestions: Material selection: A216 WCB or alloy steel is recommended for the valve body, and the plug is forged + surface hardened; Grease adaptation: High-temperature working conditions (＞180℃) require high-stability greases such as perfluoropolyether (PFPE).
GNEE Inverted Pressure Balance Lubricated Plug Valve
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