I. Core Functions
- Inherent Safety Device: Internal Blowout Prevention (IBOP) for drill strings
- Emergency Shutdown Response: Dual-trigger closure (reverse circulation pressure + spring force) with response time <1 second
- Operational Compatibility:
- Standard mode: Installed between drill pipe and bit
- Standby mode: Pre-stored on platform for rapid emergency deployment
II. Mechanical Operating Principle
III. Technical Advantages
- Overpressure Protection: Withstands ≥105 MPa differential pressure (API 16C certified)
- Zero Leakage: Metal seal achieves API 6A V0 rating
- Temperature Range: Full operation at -29°C to 177°C
- Erosion Resistance: Hardened flow channels (HRC≥60)
Operational Warnings
1. Never conduct forward circulation without running tool installed (causes abnormal closure)
2. Clean spring chamber after each trip (prevents mud solidification)
3. Storage temperature > -20°C (prevents seal ring embrittlement)
The flapper check valve provides mechanical-hydraulic dual-redundancy sealing, serving as a critical safety barrier for internal blowout prevention in high-risk applications including HPHT wells and deepwater drilling.
