Double Isolation Plug Valve Description
The double isolation plug valve is a valve that integrates two independent sealing units through a single valve body. It adopts a double plug (double plug) structure, which can achieve double block and bleed (DB&B) function without disassembling the pipeline. It is used for complete isolation of high-risk media to ensure the safety of maintenance operations.
Structure and design features
Double plug design
Independent sealing unit : Two plugs in series achieve double isolation through independent operation to avoid the risk of single point failure ; Pressure balance technology : The pressure in the valve body is evenly distributed, reducing the wear of the sealing surface and extending the service life . Material and standard
Valve seat material : Metal-to-metal seal (such as stainless steel, alloy steel) or soft sealing material (PTFE), supporting high temperature and high pressure conditions ; Certification standard : Meets API 6D, API 599, ISO 14313 and other industrial standards . Compact design
Compared with traditional double valves : Replaces the traditional double valve series solution, reducing 50% installation space and 30% weight .
Double Isolation Plug Valve Specification
| Terms | Specification |
|---|---|
| Nominal diameter | DN15–600(NPS ½–24) |
| Pressure level | PN20–420(Class 150–2500) |
| Applicable temperature | -29℃~425℃(Adjust according to the sealing material) |
| Leakage level | Meets API 598 standard (zero leakage) |
Advantages
Improved safety
Double isolation verification can be performed before maintenance to ensure that the system is completely isolated to avoid the risk of medium leakage;
Applicable to flammable, explosive or highly toxic media such as oxygen and natural gas.
Economical and convenient
The traditional double valve system can be directly replaced without pipeline modification, reducing modification costs;
During maintenance, only the plugging device needs to be replaced, and there is no need to disassemble the valve body as a whole
GNEE Double Isolation Plug Valve
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