Added to quote
Your quote has no products.
Quick product entry
IMI Bopp & Reuther
Si 9 - High Capacity Safety Valve
High-capacity steam safety valve designed to ASME I for power and process steam applications.
No adjustment rings for stable, maintenance-free performance.
Stellited disc and seat ensure durability and long service life.
Certified to ASME I, III, and VIII for compliance.
Features
The Si 9 Series safety valves ensure reliable overpressure protection in steam boilers, superheaters, and process steam systems. Designed to ASME I, III, and VIII standards, they feature a fixed overpressure and blowdown mechanism with no adjustment rings required, ensuring consistent performance. A full nozzle design and stellited disc and seat provide durability and tight shutoff, while a special disc spring design supports high pressures and large valve sizes. Available in sizes from NPS 1.5 to NPS 12 and handling pressures up to 330 bar g, the Si 9 Series is ideal for high-performance steam applications.
Key features
Sizes: NPS 1.5 to NPS 12
Set pressures: 3–330 bar g
Temp: up to 650°C
No adjustment rings needed
Full nozzle design
Stellited disc and seat
25% backpressure allowed
Specifications
Fluid Types
Gas
Vapour
Material (EN)
EN 1.0619
EN 1.7379
PN Rating (PN)
320
Maximum Set Pressure (barg)
330
Material (ASME)
ASME WCB
ASME WC9
ASME C12A
Inlet Size (DN)
40
300
Design Codes
EN
ASME V
Service Category
Severe
Semi-Severe
Max. ASME Rating
2500
Certification
PED
ASME V
IBR
Temperature Limits (°C)
-29 to 650
Resources
By downloading, you confirm that you accept our Terms and Conditions. Please refer to them for full details on usage.
