I. Basic Technical Parameters

II. Structural Composition and Key Components

1. Core Structural System

• Body Component Set
  • Main Body: Q235B carbon steel (yield strength ≥235MPa), inner surface treated with anti-rust paint (dry film thickness ≥80μm)
  • Flange: Welded neck flange (GB/T 9115.1), grade RF (Raised Face), bolt hole number: 8 (M16×70 bolts for PN16)
  • Force Transfer Rod: 45# carbon steel (tensile strength ≥600MPa), thread specification M20×800mm, surface galvanized (Zn coating ≥50μm)
• Sealing System
  • Gasket: EPDM rubber (hardness 60±5 Shore A), applicable to water, steam, and non-corrosive media
  • Sealing Structure: Groove-type compression seal, leakage rate ≤0.05L/min under 1.1×design pressure

2. Force Transfer Mechanism

• Force Transfer Path: Medium pressure thrust → Flange → Force transfer rod → Fixed support
• Thrust Calculation Example:
  • For PN16 (1.6MPa), effective area A = π×(200/2)² = 31416mm²
  • Thrust F = 1.6MPa×31416mm² = 50265N (≈5.1 tons), borne by 4 force transfer rods (each rod bears ~1.28 tons)

III. Application Scenarios and Installation Requirements

1. Typical Applications

• Pipeline Systems Requiring Thrust Transmission
  • Urban water supply/drainage main pipelines (DN200 suitable for flow ≤150m³/h)
  • Thermal power plant condensate pipelines (temperature ≤150℃, pressure ≤1.6MPa)
  • Industrial wastewater treatment systems (non-acidic/alkaline media)
• Anti-Vibration and Noise Reduction Scenarios
  • Pump inlet/outlet sections (reducing vibration transmission to pipelines)
  • Compressor connecting pipelines (absorbing mechanical vibration)

2. Installation Key Points

• Coaxiality Requirement: Axial deviation ≤1mm/m, avoiding eccentric installation causing uneven force on rods
• Support Arrangement:
  • Fixed Support: Within 10D (2m) from the joint, bearing capacity ≥1.5×calculated thrust
  • Guide Support: Within 3D (600mm) at both ends, limiting lateral displacement
• Bolt Tightening Sequence: Cross-tighten in 2~3 stages, torque for M16 bolts: 120~150N·m

IV. Performance Testing and Quality Standards

1. Testing Indicators

• Hydrostatic Test: 1.5×design pressure (2.4MPa for PN16), holding for 30 minutes without leakage
• Air Tightness Test: 1.1×design pressure (1.76MPa), bubble detection showing no air leakage
• Fatigue Test: 5000 cycles under ±10mm displacement, no crack or leakage after testing

2. Compliance Standards

• Domestic: GB/T 12465 Couplings for Pipeline Components
• Mechanical Industry: JB/T 6409 Force Transfer Joints for Pipeline Systems
• Flange Standards: GB/T 9115 (PN16), HG/T 20592 (European system)

V. Comparison with Similar Products (Expansion Joints)

VI. Maintenance and Failure Prevention

• Routine Inspection Items:
  • Bolt tightness (re-tighten every 6 months, torque retention ≥90%)
  • Gasket aging (replace if cracks >2mm or hardness increase >10 Shore A)
  • Rod surface corrosion (touch up zinc coating if peeling)
• Failure Warning Signs:
  • Abnormal noise during operation (may indicate loose bolts)
  • Local leakage (gasket damage or flange misalignment)
  • Visible deformation of force transfer rods (overload condition, immediate shutdown for inspection)

VII. Selection Considerations for DN200 Models

1. Pressure Grade Matching:
   • For urban water supply (≤0.8MPa), select PN10; for industrial systems (1.6MPa), use PN16.
2. Medium Characteristics:
   • Acidic media (pH <6): Upgrade to 304 stainless steel flange + fluororubber gasket.
   • High-temperature steam (150~200℃): Adopt graphite spiral wound gasket + heat-resistant paint for the body.
3. Pipeline Layout:
   • For L-shaped pipelines, combine with angular type force transfer joints (allowable angle ≤3°).
   • In seismic zones, add flexible connectors (displacement allowance ≥20mm)