Dart-Type Float Valve: Critical Well Control and Drill String Protection
The Backflow Crisis During Connections
When pumps stop during pipe connections:
-Drill cuttings backflow into BHA → bit nozzle plugging → 8-12 hours NPT
-Abrasive sediment ingress accelerates drill string corrosion → $150K replacement cost
-Uncontrolled fluid reversal can trigger underground blowouts
Our dart-type float valve provides:
✅ Instant automatic closure upon pump stoppage
✅ 10,000psi pressure integrity for well control situations
✅ API 7-1 certified reliability
Precision Engineering for Critical Applications
Dual-Activation Closure System
| Activation Mechanism | Response Time | Application Scenario |
| Pressure Differential | <1 second | Normal pump stoppage during connections |
| Spring Assistance | <2 seconds | Low-flow or slow pump ramp-down situations |
| Emergency Pressure | Instantaneous | Kick/blowout conditions |
→ Arrow-shaped dart design minimizes flow restriction when open
→ Metal-to-metal primary seal with elastomer backup
Technical Specifications
| Parameter | Specification |
| Pressure Rating | 5,000psi / 10,000psi options |
| Temperature Range | -50°C to 175°C |
| Flow Area | 85-90% of tool ID (minimal restriction) |
| Materials | 4145HM steel, tungsten carbide seats, H2S-resistant alloys |
| Connections | API REG, IF, FH (all standard sizes) |
| Certifications | API Spec 7-1, NACE MR0175, ISO 9001:2015 |
Operational Advantages
-Drilling Efficiency
Eliminate nozzle plugging → save 16-24 hours/well in NPT
Reduce bit trips by 60% through prevented backflow contamination
-Well Control Security
Secondary barrier during kick situations
Pressure containment inside drill string while making connections
-Economic Value
$200K+ savings/well in trouble time and equipment replacement
3:1 ROI typically achieved in first well of use
Field Applications
HPHT Wells: 175°C operating temperature capability
Sour Gas Operations: NACE MR0175 compliant materials
Deepwater Drilling: 10,000psi rating for narrow margin applications
Exploratory Wells: Critical protection in unknown pressure environments
Underbalanced Drilling: Prevent gas influx during connections
