LESER Type 441/442 Safety Relief Valve
Product Overview
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.
Key Features
- 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.
Technical Specifications
| Parameter |
Type 441/442 DIN |
Type 441/442 ANSI |
Type 441/442 XXL |
| Set Pressure (CE) |
0.1–40 bar (1.5–580 psig) |
1–40 bar (15–580 psig) |
0.2–25 bar (2.9–362 psig) |
| Temperature Range (CE) |
-270°C to 450°C (-454°F to 842°F) |
-268°C to 538°C (-450°F to 1000°F) |
-45°C to 400°C (-49°F to 752°F) |
| Nominal Diameter at Inlet |
DN 20–DN 400 (NPS 3/4–16) |
NPS 1–8 |
DN 200–400 (NPS 8–16) |
| Actual Orifice Diameter (d₀) |
18–295 mm (0.71–11.61 in) |
18–165 mm (0.71–6.5 in) |
165–295 mm (6.5–11.61 in) |
| Actual Orifice Area (A₀) |
254–68347 mm² (0.394–105.938 in²) |
254–21382 mm² (0.394–33.142 in²) |
21382–68347 mm² (33.142–105.938 in²) |
| Flange Rating Inlet |
PN 10–PN 40 |
ASME Class 150–300 |
PN 10–PN 25, ASME Class 150–300 |
| Body Material |
0.6025, 0.7043, 1.0619, 1.4408 (Gr. 60-40-18, SA 216 WCB, SA 351 CF8M) |
SA 216 WCB, SA 351 CF8M |
1.0619, 1.4408 (SA 216 WCB, SA 351 CF8M) |
| Bellows Material (Optional) |
Stainless steel, elastomer |
Stainless steel, elastomer |
Stainless steel |
| Seat Gasket |
Metallic, sealing plate, O-ring |
Metallic, sealing plate, O-ring |
Metallic, sealing plate |
| Load Type |
Spring-loaded |
Spring-loaded |
Spring-loaded |
Applications
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.
Frequently Asked Questions
What fluids are the Type 441/442 valves designed for?
They are suitable for steam, gases, and liquids, per AD 2000-Merkblatt A2 standards.
How quickly do these valves open?
They open rapidly within a 5% overpressure range, ensuring maximum mass flow discharge.
Are the valves compliant with international standards?
Yes, they meet PED, ASME Section VIII, AD 2000-Merkblatt A2, CRN, AQSIQ, EAC, and classification society standards.
What is the benefit of the XXL configuration?
The XXL variant supports larger nominal sizes (DN 200–400) for high-flow applications.
How do these valves ensure low maintenance?
The rolled-in seat and self-draining body design minimize wear and residue buildup.
Contact Us
For more information about the LESER Type 441/442 Safety Relief Valves, pricing, or to request a demo, contact our team:
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