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NIPO
The double-ball double-cut-off relief ball valve is a high-safety special valve with an innovative double-ball series structure. Through two independent spherical sealing units and a dedicated cavity relief system, dual isolation of the upstream and downstream media is achieved, and the pressure within the two sealed cavities is safely discharged. This product strictly adheres to the API 6D standard and is the ultimate safety solution for critical isolation points in the oil, gas and chemical industries.
Parameter Name | Parameter |
Valve body structure | double-ball series design |
Pressure rating | Class 150-900 (PN16 - PN150) |
Temperature range | -46℃ to +538℃ |
Connection method | RF flange/RTJ ring connection/butt-weld end |
Valve body material | A216 WCB/A351 CF8M/A352 LCC |
Spherical material | Stainless steel substrate + supersonic sprayed tungsten carbide |
Valve seat material | reinforced PTFE/metal seal/composite material |
DBB function | Complies with the API 6D dual isolation venting standard |
Fire protection design | API 607 / API 6FA |
Design standard | API 6D/ASME B16.34 |
Independent sealing system: Two spheres operate independently, each forming a complete sealing barrier
Zero leakage guarantee: ANSI B16.104 Class V sealing is achieved simultaneously in both upstream and downstream
Fail-safe design: The failure of a single seal does not affect the sealing performance on the other side
Specialized relief system: Equipped with standard relief valve interfaces, it supports pressure discharge, detection and sampling
Visual pressure indication: An optional pressure gauge can be equipped to monitor the status of the cavity in real time
Automatic safety relief: When the cavity is overpressurized, it can be automatically relieved through the safety valve
Independent maintenance unit: Each spherical unit can be independently disassembled for maintenance
Online maintenance capability: Supports online replacement of individual sealing units
Quick disassembly and assembly structure: Special fixture design reduces maintenance time by 50%
Low-torque operation: Optimized flow channel design reduces operating torque by 30%
Anti-static design: Double spheres continuously conduct static electricity
Anti-blow valve stem: Both the upper and lower valve stems adopt an anti-blow structure
Pressure rating: Class 150-900 (PN16-PN150)
Temperature range: -46℃ to +538℃
Connection method: RF flange /RTJ ring connection/butt-weld end
Design standard: API 6D/ASME B16.34
Sealing grade: ANSI B16.104 Class V
Oil and gas: wellhead equipment, pipeline pigging stations, inlet and outlet of storage tanks
Chemical process: Reactor isolation, toxic medium transportation, high-pressure process pipeline
Energy and power: Fuel cut-off for boilers, isolation of main steam lines
Special applications: submarine pipelines, LNG facilities, strategic reserve depots
The double-ball double-truncated relief ball valve, through its innovative double-ball structure, reliable DBB function and strict quality control, provides industrial users with:
Absolute safety isolation: Double sealed barriers minimize the risk level
Online status monitoring: Real-time grasp of cavity pressure for preventive maintenance
Long service life: Designed for 30 years, maintenance costs are significantly reduced
Intelligent control integration: Supports automation systems to achieve remote monitoring
This product is an ideal choice for the transportation of hazardous media, isolation of key equipment, and working conditions requiring the highest safety level, providing a reliable guarantee for modern industrial safe production.
