I. Core Performance Indicators

II. Structural Features and Operational Advantages

1. Through-Type Force Transfer Screw Design
   • Structure: Flanges at both ends are rigidly connected by 4-12 force transfer screws (M16-M30), typically made of 4.8-grade carbon steel or 304 stainless steel.
   • Advantage: Axial force is directly transmitted via screws, preventing tensile stress on pipeline interfaces (e.g., water hammer force during pump start is conducted to concrete supports through screws).
2. Loose Sleeve Flange Connection
   • Feature: Flanges can slightly rotate relative to the short pipe, allowing pipeline axis deviation ≤1°, reducing installation alignment difficulty.
   • Scenario: Suits construction sites with minor pipeline axis deviations (e.g., ±3mm), minimizing installation stress.
3. Diversified Sealing Surface Design
   • Flat Sealing: For non-corrosive media like water/air, with sealing surface roughness Ra≤12.5μm;
   • Tongue-Groove Sealing: For flammable/explosive media (e.g., gas), preventing gasket extrusion and enhancing sealing reliability by 30%.
4. Vibration & Fatigue Resistance
   • Screws use lock nuts (double nuts or lock washers), with <5% loosening probability under ≤50Hz vibration (e.g., fan pipes).
   • Metal components undergo annealing, with fatigue strength ≥150MPa, enduring over 100,000 cycles of alternating loads (e.g., pump start/stop cycles).

III. Materials and Anti-Corrosion Features

IV. Application Scenario Adaptability

1. Pump Inlet/Outlet Connections
   • Feature: Transmits axial thrust during pump start/stop (e.g., 15kW pump generates ~30kN starting thrust), preventing flange leakage from repeated stress.
   • Case: Fire pump connections in high-rise buildings require C2F-type force transfer joints (GB/T 12465 standard).
2. Valve-Pipe Connections
   • Advantage: Torque from valve opening/closing is conducted to supports via force transfer joints, protecting valve sealing surfaces (e.g., DN200 butterfly valve has ~120N·m switching torque).
   • Scenario: Regulating valves in waterworks, preventing valve stem deformation from long-term stress.
3. Segmented Fixing for Long-Distance Pipelines
   • Function: Installed between fixed supports to disperse internal pressure thrust (e.g., DN500 pipeline at 1.0MPa exerts ~196kN thrust, requiring 3-5 force transfer joints for distribution).
   • Note: Must be used with guide supports to ensure linear axial force transmission.
4. Vibrating Equipment Interfaces
   • Characteristic: Absorbs low-frequency vibrations (amplitude ≤0.5mm) from compressors/fans, reducing impact on pipeline interfaces (e.g., fan outlet vibration frequency 20-30Hz).
     
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V. Comparative Advantages vs. Other Joints

VI. Selection and Usage Notes

1. Parameter Calculation
   • Axial thrust F = medium pressure P × pipeline inner cross-sectional area A (e.g., DN200 at 1.6MPa: F=1.6×3.14×0.1²≈50kN, requiring 4 M20 screws).
   • Seal temperature must match the medium (e.g., 180℃ steam needs FKM; ordinary NBR ages and leaks at high temperatures).
2. Installation Key Points
   • Force transfer screws should be tightened diagonally and uniformly (torque reference: M20 screw ~70-90N·m) to prevent flange skew and sealing failure;
   • Fixed supports must be set at both ends of the pipeline system, with compressive strength ≥1.5× axial thrust (safety factor).
3. Maintenance Features
   • Check screw tightness every six months (monthly for vibrating conditions), retighten promptly if loose;
   • In corrosive environments, inspect anti-corrosion coating integrity annually (repair damaged areas with epoxy paint).