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© 2025 IMI plc, All Rights Reserved
© 2025 IMI plc, All Rights Reserved
IMI Bopp & Reuther
SiZ/SiR 2507 Series - Controlled High-Pressure Safety Valve with Pneumatic or Hydraulic Control
Designed for use in conventional and nuclear power plants, these valves offer precise pressure control and reliable operation, even during partial discharge.
Delivers stable performance within tight operating limits, including under partial discharge.
Compact design with bayonet connection ensures quick installation and easy maintenance.
Supplementary loading mechanism maintains seat tightness at setpoint or during lift.
The SiZ 2507/SiR 2507 series is a spring-loaded safety valve range designed for main steam lines, boiler, reheater, and piping protection in power plants. Optional sliding pressure control makes them suitable for large steam generators and advanced thermal systems. SiZ 2507 is pneumatically assisted, while SiR 2507 uses hydraulic actuation. Both variants ensure reliable performance and ease of maintenance in conventional and nuclear applications.
Key features
Spring-loaded design with assisted actuation
Pneumatic version (SiZ) and hydraulic version (SiR)
Optional sliding pressure control
Additional pneumatic load supports valve closure
Belleville spring with ball bearing contact
Integrated piston for safety and manual action
Suitable for main steam, HRH and CRH protection
Compact design for reduced installation height
Bayonet connection for easy maintenance