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IMI CCI
PPS - Main Steam and Feedwater Isolation Valve with SMA
Reliable main steam and feedwater isolation valve with system medium actuation (SMA), available as a complete valve assembly or retrofit solution.
System medium actuation (SMA) uses the process fluid to operate the valve, eliminating the need for auxiliary systems and reducing maintenance requirements.
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.
Features
The PPS Gate Valve combines parallel plate sliding technology with system medium actuation (SMA) to deliver reliable main steam and feedwater isolation in nuclear power plants. Available as complete valve assemblies or as SMA retrofit solutions for existing isolation valves, PPS technology reduces system complexity while maintaining dependable performance in critical nuclear applications.
Why choose PPS?
The PPS valve combines proven gate valve technology with system medium actuation (SMA), using the process medium to operate the valve and eliminating the need for dedicated auxiliary actuation systems. The result is a simpler design with fewer active components, reduced maintenance requirements, lower lifecycle costs and proven reliability in critical nuclear isolation service.
System medium actuation (SMA) retrofit solutions
In addition to complete valve assemblies, IMI can supply system medium actuation (SMA) retrofit solutions for existing main steam and main feedwater isolation valves. By retaining the existing valve body and replacing the actuator system, operators can gain the benefits of SMA technology while reducing installation scope, engineering effort and outage costs. Existing valve bodies and discs can often be retained, helping plants modernise critical isolation valves without complete replacement.
Key features
Designed for nuclear applications
System medium actuation for simplified, power-independent operation
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
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
