F11, F22, and F91 Globe Valves are critical control components engineered specifically for High-Temperature and High-Pressure (HTHP) environments within power generation, petrochemical refining, and boiler systems. Featuring forged alloy steel bodies, the primary distinction among these valves lies in the varying proportions of Chromium (Cr) and Molybdenum (Mo) alloying, which effectively addresses the critical challenges of metallic creep and oxidation at elevated temperatures.
F91 / F22 / F11 Globe Valves Specification
| Item | Specifications |
| Design Standard | API 623 / ASME B16.34 / BS 1873 |
| Pressure Class | Class 150, 300, 900, 2500 |
| Nominal Diameter | DN80 (3"), DN100 (4") |
| Connection Type | Flanged (RF/RTJ) or Butt-Weld (BW) |
| Working Temp | F11/F22: ≤570°C; F91: ≤650°C |
| Seat Hard-facing | Stellite 6 (Cobalt-based alloy) - Mandatory for HTHP |
| Operation | Handwheel, Bevel Gear, or Electric Actuator |
Construction & Structural Design
For high-pressure classes (Class 900–2500), the design prioritizes sealing integrity under thermal expansion:
Bonnet Connection:
Class 150–600: Bolted Bonnet (BB) with spiral wound gaskets or ring joints.
Class 900–2500: Pressure Seal Bonnet (PSB). As internal pressure increases, the sealing force on the gasket increases, preventing leaks caused by bolt relaxation at high temperatures.
OS&Y (Outside Screw and Yoke): The stem threads are outside the media flow, ensuring they remain lubricated and protected from high-temperature corrosion.
Disc Design:
Plug Type: Standard for on/off service.
Regulating Type: Designed for throttling applications.
Backseat Design: Allows for the replacement of stem packing while the valve is in the fully open position.
drawing of Globe valve-DN100 DN80-class2500 900 300 150-F91 F22 F11 A105
Dimension Table (Approx. Values based on ASME B16.10)
Note: Dimensions refer to Flanged Ends (RF). Actual data may vary by manufacturer.
| Pressure Class | Size | Face-to-Face L (mm) | Height H-Open (mm) | Weight WT (kg) |
| Class 150 | DN80 (3") | 241 | 420 | 45 |
| DN100 (4") | 292 | 510 | 75 | |
| Class 300 | DN80 (3") | 318 | 480 | 65 |
| DN100 (4") | 356 | 580 | 110 | |
| Class 900 | DN80 (3") | 381 | 650 | 180 |
| DN100 (4") | 457 | 780 | 260 | |
| Class 2500 | DN80 (3") | 578 | 850 | 380 |
| DN100 (4") | 673 | 1100 | 550 |
Material Comparison & Performance Data
| Material (ASTM) | Chemical Composition | Advantage |
| F11 | 1.25Cr-0.5Mo | Base heat-resistant steel; good hydrogen resistance. |
| F22 | 2.25Cr-1Mo | Typical anti-hydrogen steel; used in HTHP hydro-processing. |
| F91 | 9Cr-1Mo-V-Nb | Supercritical Grade; extremely high creep-rupture strength; reduces valve wall thickness. |
Features & Applications
Features:
Erosion Resistance: Globe valves experience significant turbulence. F91/F22 valves feature Stellite 6 hard-facing on the seat and disc (Hardness HRC 40-45) to resist high-velocity steam erosion.
Zero-Leakage Sealing: Precision-lapped seating surfaces meet API 598 pressure testing standards for tight shut-off.
High-Temp Smooth Operation: Stems are quenched, tempered, and nitrided to prevent galling or seizing under high thermal stress.
Applications:
Thermal Power Plants: Main steam lines, feedwater systems for supercritical and ultra-supercritical units (primarily F91/F22).
Petrochemical Refineries: Hydrogenation units, delayed coking, and catalytic cracking units handling high-temperature oil/gas (primarily F22).
Boiler Systems: High-pressure steam isolation, drainage, and instrument main lines.
GNEE Globe valve workshop
FAQ
What is ASTM A182 F91 material?
ASTM A182 F91 is a high-strength, forged alloy steel (specifically a martensitic 9Cr-1Mo steel) designed for use in extreme high-temperature and high-pressure environments. Often referred to as "Grade 91," it is the "gold standard" material for modern power plants and refineries.
What is A182 grade F11 material?
ASTM A182 Grade F11 is a low-alloy forged steel known as "Cr-Mo" (Chromium-Molybdenum) steel. It is one of the most widely used materials for high-temperature service in the power and petrochemical industries.
What is F22 material in valves?
ASTM A182 F22 is a heavy-duty, low-alloy forged steel famously known as 2.25Cr-1Mo steel. It is a "step up" from F11, providing significantly better strength and heat resistance for valves used in critical high-pressure systems.
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