Gas pressure relief valve Si 0

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Product overview
Si 0 Series valve provides compact, durable pressure relief with stainless steel design for extreme temperatures and pressures. Constructed in EN 1.4571 / ASME 316TI stainless steel, it handles set pressures up to 400 bar and temperatures from -270°C to +400°C. Suitable for vapours, gases and liquids in industries such as chemical, petrochemical and technical gases, and for mobile pressure vessels. Available options include bellows for high back pressure and a Stellite hard-faced seat for enhanced wear resistance. Designed and certified to relevant safety standards for long-term reliability in critical applications.

Highlights

• Stainless steel safety valve for precise overpressure protection in demanding industrial environments
• Rated up to 400 bar with compact design
• Wide temperature capability from -270°C to +400°C
• Stellite hard-faced seat option for improved wear resistance

Key features

• Compact stainless steel body (EN 1.4571 / ASME 316TI)
• Temperature range: -270°C to +400°C
• Set pressure range: 0.45–400 bar
• Bellows option to cope with high back pressure
• Inlet sizes (DN): 15, 25
• Stellite hard-faced seat for durability
• Suitable for liquids, gases and vapours
• Complies with DIN EN ISO 4126-1
• Suitable for mobile pressure vessels
• Blowdown: ~10% for vapours, ~20% for liquids

Applications
Designed for critical overpressure protection in chemical, petrochemical, technical gas systems and mobile pressure vessels where precise and reliable relief performance is required.

Specifications

• Fluid types: Liquid, Gas, Vapour
• Material (EN): EN 1.4571
• Material (ASME): ASME 316TI
• PN Rating: 400
• Maximum set pressure (barg): 400
• Inlet size (DN): 15, 25
• Design codes: EN
• Service category: General, Semi-Severe
• Max. ASME rating: 2500
• Certification: PED
• Temperature limits (°C): -270 to 400
• Blowdown: 10% (vapours), 20% (liquids)
• Seat: Stellite hard-faced seat (wear resistant)
• Options: Bellows for high back pressure