Flanged Boiler Safety Relief Valve Leser 441 442 Series Angle Valve Spring Loaded Full Lift Safety Valve

The LESER Type 441/442 Full Lift Safety Relief Valves are designed for high-capacity pressure relief in demanding industrial applications. Engineered to open rapidly within a 5% overpressure range, these spring-loaded valves ensure maximum mass flow discharge for steam, gases, and liquids. Compliant with standards like PED, ASME Section VIII, and AD 2000-Merkblatt A2, they are available in DIN and ASME flange configurations, making them a versatile choice for industries such as chemical processing, petrochemicals, and power generation. With robust construction and a high discharge capacity, the Type 441/442 valves are among the best-selling spring-loaded flange safety valves worldwide.

• High Discharge Capacity: Opens rapidly within 5% overpressure for maximum mass flow, ideal for steam and gas applications.
• Versatile Configurations: Available in DIN (Type 441/442 DIN), ANSI (Type 441/442 ANSI), and XXL (Type 441/442 XXL) for large-scale applications.
• Robust Materials: Constructed with gray cast iron, nodular cast iron, carbon steel, or stainless steel for durability.
• Global Certifications: Certified to PED, ASME Section VIII, AD 2000-Merkblatt A2, CRN, AQSIQ, EAC, and classification societies (LR, RINA, DNV GL, BV, ABS).
• Flexible Connections: Supports DIN EN 1092 (DN 20–400) and ASME B16.5 (NPS 3/4–16) flange options.
• Low Maintenance: Rolled-in seat and self-draining body reduce wear and residue buildup.
• Customizable Options: Includes O-ring soft seals, metallic sealing plates, and bellows for specific applications.
• Rapid Delivery: Standard configurations available in 2 weeks.

The LESER Type 441/442 valves are engineered for high-capacity pressure relief in various industries:

• Chemical Industry: Protects reactors, distillation columns, and waste gas systems.
• Petrochemicals: Ensures safety in refining and pipeline operations.
• Power Generation: Manages pressure in steam boilers and heat-transfer systems.
• Pharmaceuticals: Provides reliable relief in process equipment.
• Shipbuilding: Supports marine systems with high mass flow requirements.

They are suitable for steam, gases, and liquids, per AD 2000-Merkblatt A2 standards.

They open rapidly within a 5% overpressure range, ensuring maximum mass flow discharge.

Yes, they meet PED, ASME Section VIII, AD 2000-Merkblatt A2, CRN, AQSIQ, EAC, and classification society standards.

The XXL variant supports larger nominal sizes (DN 200–400) for high-flow applications.

The rolled-in seat and self-draining body design minimize wear and residue buildup.

For more information about the LESER Type 441/442 Safety Relief Valves, pricing, or to request a demo, contact our team:

• Email: edward.zhao@gongboshi.com
• Phone: +8615000725058
• Website:https://www.shgongboshi.com/

• LESER Compact Performance Valves: For smaller systems with tight shutoff requirements.
• LESER API Series: API-compliant valves for oil and gas industries.
• LESER Clean Service Valves: For hygienic applications in pharmaceuticals and food processing.
• LESER Pilot-Operated Valves: For high-pressure systems with minimal emissions.