Gas pressure relief valve Si C1

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Product overview
Compact safety valve for pressure relief in vapour, gas and liquid services with multiple connection options and wide pressure and temperature capability.

Summary

• Compact safety valve suitable for chemical, petrochemical and technical gas systems.
• Designed for high set pressures (up to 200 barg) and extreme temperatures (-200 °C to +427 °C).
• Multiple inlet connections (EN/ASME flanges and threaded), ball-bearing disc sealing and optional bellows for back-pressure compensation.

Detailed description
The Si C1 series delivers reliable pressure relief performance in confined installations where flexibility and durability are required. Its block body construction with stainless steel internal components and materials compliant with EN and ASME specifications ensures resistance to corrosive media and thermal cycling. The ball-bearing disc improves sealing performance and longevity, while optional bellows provide enhanced back-pressure compensation for steam and vapour services. The product is available in DN15 and DN25 sizes and supports ASME and EN design codes and certifications.

Key features

• Pressure range: 0.55 – 200 bar (set and operating)
• Temperature range: -200 °C to +427 °C
• Inlet sizes: DN15, DN25
• Connection options: EN/ASME flanges or threaded connections
• Ball-bearing disc for improved sealing
• Optional bellows for back pressure compensation
• Certifications: PED, ASME UV, DIN/EN

Specifications (table)
Fluid Types: Liquid; Gas; Vapour
Material (EN): EN 1.0619; EN 1.4408
PN Rating (PN): 320
Maximum Set Pressure (barg): 200
Material (ASME): ASME WCB; ASME CF8M
Inlet Size (DN): 15; 25
Design Codes: EN; ASME UV
Temperature Limits (°C): -200 to 427
Max. ASME Rating: 1500
Certification: PED; ASME UV
Service Category: General

Technical specifications

• Model: Si C1
• Type: Pressure relief safety valve for liquid, gas and vapour service
• Pressure capability: set and operating up to 200 barg (PN up to 320)
• Temperature capability: -200 °C to +427 °C
• Inlet sizes available: DN15 and DN25
• Materials (EN): EN 1.0619, EN 1.4408
• Materials (ASME): ASME WCB, ASME CF8M
• Design codes: EN, ASME UV
• Max. ASME rating: 1500
• Sealing: ball-bearing disc
• Optional features: bellows for back pressure
• Certifications: PED, ASME UV (and other IMI Bopp & Reuther certification documents available)