Cryogenic Monobloc Free-forged Globe Valve

Description

CRYOGENIC MONOBLOC FREE-FORGED GLOBE VALVE
Model: MF-CGV-F304-CL1500
(Monobloc Forged · Cryo Globe Valve · F304 · Class 1500)

1. Key Designation Features
Term Significance
Monobloc Free-Forged Single-piece body/bonnet forged from solid F304 billet (no welds/seams)
F304 Austenitic stainless steel for cryogenic toughness (ASTM A182 compliant)
CL1500 ASME Class 1500 pressure rating (250 bar @ -196°C)
2. Critical Specifications
Parameter Specification
Body/Bonnet Single-Piece Free-Forged F304
• Forging Ratio ≥ 4:1
• Solution Annealed per ASTM A961
Size Range ½” to 4″ (DN15-DN100)
Temp Range -196°C to +100°C (LNG, LN2, LOx service)
Seat/Seal Stellite 6 hardfaced disc + Flexible graphite/PTFE stem packing
Cryo Extension Standard 250mm bonnet (2″ valve, scalable per size)
Compliance BS 6364, ISO 28921-1, ASME B16.34
3. Why Monobloc Free-Forged?
Benefit Technical Impact
Zero Weld Lines Eliminates HAZ cracks at cryogenic temps
Grain Flow Continuity Forging aligns grain structure → 50% higher impact toughness at -196°C (vs. cast)
No Corrosion Traps Seamless interior reduces pitting risk in LNG
Pressure Integrity Homogeneous material withstands thermal shocks
4. Testing & Certification
Test Standard Requirement
Charpy V-Impact ASTM A370 ≥ 45J @ -196°C (body material)
Helium Seat Test BS 6364 Annex A ≤ 1×10⁻⁶ mbar·L/s leakage @ -196°C
Cryo Pressure Test ISO 28921-1 1.5x rated pressure @ -196°C (30 min hold)
Material Certs EN 10204 3.1 Full traceability of forging billet
5. Ordering Code Example
MF-CGV-F304-2″-1500-RF-BS6364-OSY

MF: Monobloc Free-Forged

CGV: Cryogenic Globe Valve

F304: Body Material

2″: Size

1500: ASME Class

RF: Raised Face Flange

BS6364: Design Standard

OSY: Outside Screw & Yoke

6. Applications
✅ LNG terminals (Liquid methane @ -162°C)
✅ Air Separation Plants (LN2 @ -196°C, LOx @ -183°C)
✅ Liquid Hydrogen Systems (-253°C, with SS316L upgrade)

⚠️ For Oxygen Service: Mandatory ASTM G93 cleaning + non-sparking stem tips

7. Documentation
Forging Maps: Ultrasonic Testing (UT) reports per EN 10228-3

Cryogenic Test Certificates: Leakage/performance data at -196°C

Material Chemical Analysis: ASTM A751 (C ≤ 0.08%, S ≤ 0.015%)