Engineered for automated isolation in ultra-supercritical power generation, the 2500LB Electrically Actuated High-Temperature and High-Pressure Integral Forged F22 Pressure Seal Gate Valve is the ultimate solution for extreme steam systems.
Unlike conventional cast steel valves, this valve features an integral forged ASTM A182 F22 body (2.25Cr-1Mo alloy steel), eliminating casting defects and providing superior structural integrity under severe thermal cycling. Designed specifically for high-temperature power stations, the pressure seal bonnet utilizes internal system pressure to dynamically enhance sealing integrity as pressure increases. Coupled with a high-performance electric actuator and butt-welded end connections, this valve ensures smooth flow, zero-leakage automated isolation, and reliable remote control in extreme high-pressure environments up to Class 2500.
Key Features & Benefits
• F22 Integral Forged Steel Construction: Manufactured from a single piece of high-grade ASTM A182 F22 forged steel. The continuous grain flow provides unmatched tensile strength, excellent high-temperature creep resistance, and leak-tight reliability in high-pressure steam service.
• Advanced Electric Actuation: Equipped with a multi-turn electric actuator for precise, automated remote control. Features built-in limit switches, torque protection, and manual override capabilities for seamless integration into modern DCS/PLC power plant systems.
• Pressure Seal Bonnet Design: Utilizes a self-energizing pressure seal structure. As internal steam pressure increases, the sealing force increases proportionally, ensuring zero leakage even during rapid startup and shutdown transients in Class 2500 systems.
• Stellite Hard-Faced Trim: Seat rings and wedge seating surfaces are overlaid with Stellite 6 (Co-Cr-W alloy) to resist severe erosion, corrosion, and galling in high-temperature steam flows up to 600°C.
• API 600 & ASME Compliance: Designed and manufactured strictly to API 600 and ASME B16.34 standards, ensuring dimensional compatibility, structural safety, and reliable performance in global power infrastructure.
Technical Specifications
Parameter | Specification |
Valve Type | Electric Actuated Pressure Seal Integral Forged Gate Valve |
Design Standard | API 600, ASME B16.34, E101 |
Body Material | ASTM A182 F22 (Integral Forged) |
End Connection | Butt Weld (BW) per ASME B16.25 |
Pressure Rating | Class 2500 (PN 420) |
Size Range | 4" to 24" (DN100 - DN600) |
Temperature Range | -29°C to +600°C |
Actuation | Multi-turn Electric Actuator (with manual override) |
Testing & Inspection | API 598, NACE MR0175 (Sour Service Available) |
Applications
This high-performance electrically actuated forged gate valve is widely deployed in:
• Thermal Power Plants: Automated main steam isolation, hot/cold reheat lines, and high-pressure feedwater systems.
• Supercritical/ Ultra-Supercritical Units: Remote-controlled high-temperature and high-pressure steam piping networks.
• Nuclear Power Facilities: Non-nuclear auxiliary steam and water automated isolation.
• Heavy Industrial Boilers: High-pressure steam generation and automated distribution systems.
FAQ Section
Q: Why choose an electric actuator for Class 2500 pressure seal gate valves?
A: High-pressure steam valves require significant torque to operate. Electric actuators provide precise, automated remote control from the central control room (DCS), eliminating the need for manual operation in hazardous high-temperature environments while ensuring fast and reliable emergency isolation.
Q: Why is F22 forged steel preferred for high-temperature power station valves?
A: ASTM A182 F22 (2.25Cr-1Mo) is specifically designed for high-temperature service. The integral forging process aligns the grain structure, providing superior mechanical strength, excellent creep resistance, and higher safety margins in extreme Class 2500 power station applications compared to standard carbon steel or cast valves.
Q: How does the pressure seal bonnet work in high-temperature environments?
A: Unlike traditional bolted bonnets, the pressure seal design uses the internal media pressure to push the seal ring against the bonnet and body. The higher the system pressure, the tighter the seal becomes. This prevents the bolt-creep and leakage issues often seen in high-temperature thermal cycling.
