ANSI Stainless Steel F304/F316 Flanged Lever/Gear Double Block and Bleed Ball Valve

TIANYU ANSI 2″ 150LB Stainless Steel Double Block and Bleed Ball Valve: Precision Solution for Industrial Fluid Safety Control

I. Technical Overview

II. Core Product Features

(A) Double Block and Bleed (DDB) Design

• Bidirectional Sealing: Independent PTFE seats with spring preloading ensure bidirectional bubble-tight sealing (leakage ≤1×10⁻⁹m³/s), meeting API 598 Class IV. Blocks media under pressure simultaneously;
• Safety Pressure Relief: Central bleed port enables online pressure release, eliminating overpressure risks for hot work and pipeline maintenance;
• Floating Ball Structure: Unsupported ball self-compresses against seats via medium pressure, enhancing low-pressure sealing reliability by 25% and reducing operation torque by 15%.

(B) Material & Application Compatibility

(C) Operation & Maintenance

• Reliable Manual Drive: Standard extended lever handle (≤80N·m torque), optional gearbox (1:3 ratio) for effortless operation in frequent cycles;
• Quick-Disassembly Design: 12-point symmetric bolted bonnet allows 10-min seal replacement, improving maintenance efficiency by 30% for online servicing.

III. Technical Specs & Manufacturing

(A) Key Performance Indicators

• Pressure/Temp Range:
  • Pressure: 150LB (PN20, max 2.0MPa);
  • Temperature: -20℃~180℃ (standard), optional -40℃~200℃ (cryogenic);
• Bore & Flow:
  • 2″ full bore (DN50), Cv=100, 20% lower pressure drop than reduced-bore valves;
• Testing Standards:
  • Hydrostatic: 1.5x pressure (15-min hold);
  • Gas-tight: 1.1x pressure (nitrogen, ≤1×10⁻⁹m³/s leakage).

(B) Precision Manufacturing

1. Stainless Steel Forging:
   • Body forged from AOD-refined SS billet (C≤0.08%) via 1000-ton press (forging ratio ≥3:1), achieving ASTM No.7+ grain size;
   • Ball turned by CNC lathe to ≤0.01mm roundness, ≤0.02mm fit with seats for sealing precision.
2. Surface Treatments:
   • Mechanical polished interior (Ra≤1.6μm) reduces media deposition;
   • Passivated exterior (ASTM A967), electropolished (Ra≤0.8μm) for food-grade applications.
3. Quality Control:
   • 100% magnetic particle inspection (MT) for surface defects;
   • 50,000-cycle testing with ≥95% sealing retention (Far beyond the industry 30,000 cycles).