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IMI CCI
PPS - Main Steam and Main Feedwater Isolation Valve
Reliable main steam and feedwater isolation valve, ensuring tight shutoff with minimal pressure loss.
Retracting discs ensure no seat contact during operation, reducing wear and extending service life.
Minimal pressure loss improves efficiency while maintaining high-performance sealing for steam and water.
No auxiliary systems needed, simplifying operation and reducing maintenance costs in nuclear plants.
Features
The Parallel Plate Sliding (PPS) Gate Valve is designed for main steam and feedwater isolation in BWR and PWR reactors. Using system medium for actuation, it eliminates the need for auxiliary systems. The valve features a block design with direct-mounted pilot valves, ensuring stable performance under steam, water, and transition conditions. Built from forged or cast carbon and stainless steel, it meets QME-1 and IEEE qualification standards. With minimal pressure loss and retracting discs preventing seat wear, the PPS Gate Valve delivers high efficiency, low maintenance, and superior sealing performance, making it an ideal choice for nuclear power plants.
Key features
Designed for nuclear applications
Operates under steam, water, and transitions
Pressure class up to 2500
Sizes up to 760mm (29.9”)
Forged/cast carbon or stainless steel
QME-1 and IEEE qualified
Direct-mounted pilot valves
No stuffing box for reduced leakage
Auxiliary medium operation if power is unavailable
High redundancy levels available
Specifications
Fluid Types
Water
Steam
Port Size (")
1 to 29.9
Maximum Working Pressure (barg)
172
Material
Forged Carbon Steel
Forged Stainless Steel
Cast Carbon Steel
Cast Stainless Steel
Design Codes
ASME
EN
Temperature Limits (°C)
20 to 400
