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Flanged Industrial Safety Valve Le-ser Type 431 433 Standard Medium Flow Liquid Pressure Safety Relief Valves with Rolled-in Seat

Flanged Industrial Safety Valve Le-ser Type 431 433 Standard Medium Flow Liquid Pressure Safety Relief Valves with Rolled-in Seat

Flanged Industrial Safety Valve Le-ser Type 431 433 Standard Medium Flow Liquid Pressure Safety Relief Valves with Rolled-in Seat
Flanged Industrial Safety Valve Le-ser Type 431 433 Standard Medium Flow Liquid Pressure Safety Relief Valves with Rolled-in Seat
Categories Safety Valves
Brand Name: Leser
Model Number: 431/433
MOQ: 1
Price: US $800.00 - 1500.00/ Unit
Payment Terms: T/T
Supply Ability: 1000 units per year
Delivery Time: 60-90 work days
Packaging Details: Wooden box + protection
Temperature: -270 to 450 °C | -454 to 842 °F
Body material: carbon steel
Narrowest flow diameter: 12 - 92 mm | 0.47 - 3.62 in
Bellows material (optional): Stainless steel and elastomer
Set pressure: 0,2-40 bar | 2,9-580 psig
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Xiangjing (Shanghai) M&E Technology Co., Ltd
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Flanged Industrial Safety Valve Le-ser Type 431 433 Standard Medium Flow Liquid Pressure Safety Relief Valves with Rolled-in Seat

LESER Type 431/433 Safety Relief Valve
Product Overview

The LESER Type 431/433 Modulate Action Safety Relief Valves are engineered for reliable pressure protection across a wide range of industrial applications. Designed to handle steam, gases, and liquids, these valves feature a proportional opening characteristic, minimizing medium loss and ensuring stable operation, particularly for medium mass flows.

Key Features
  • Proportional Opening: Large proportional range ensures stable operation and minimal medium loss.
  • Versatile Material Options: Available in gray cast iron, nodular cast iron, carbon steel, and stainless steel.
  • Wide Pressure Range: Handles pressures from 0.2 to 40 bar (2.9 to 580 psig), with PN 160 options up to 160 bar.
  • Robust Certifications: PED, AD 2000-Merkblatt A2, AQSIQ, EAC, and classification societies (LR, RINA, DNV GL, BV, ABS).
  • Flexible Connections: DIN EN 1092 (DN 15–150) and ASME B16.5 (NPS 1/2–6) flange options.
  • Low Maintenance: Self-draining angle-type body and single-part spindle reduce residue and corrosion.
  • Optional Accessories: O-ring soft seal, bellows, and metallic sealing plates for customized applications.
  • Fast Delivery: Standard configurations available in 2 weeks.
Technical Specifications
ParameterType 431/433Type 431/433 PN 160
Set Pressure0.2–40 bar (2.9–580 psig)0.3–160 bar (4.35–2321 psig)
Temperature Range-270°C to 450°C (-454°F to 842°F)-270°C to 450°C (-454°F to 842°F)
Nominal Diameter at InletDN 15–DN 150 (NPS 1/2–NPS 6)DN 15 (NPS 1/2)
Actual Orifice Diameter (d₀)12–92 mm (0.47–3.62 in)12 mm (0.47 in)
Actual Orifice Area (A₀)113–6648 mm² (0.175–10.3 in²)113 mm² (0.175 in²)
Flange Rating InletPN 16–PN 40, ASME Class 150–300PN 63–PN 160, ASME Class 300–600
Body Material0.6025, 0.7043, 1.0619, 1.4408 (Gr. 60-40-18, SA 216 WCB, SA 351 CF8M)1.0619, 1.4408 (SA 216 WCB, SA 351 CF8M)
Bellows Material (Optional)Stainless steel, elastomerStainless steel
Seat GasketMetallic, sealing plate, O-ringMetallic, sealing plate, O-ring
Load TypeSpring-loadedSpring-loaded
Applications

The LESER Type 431/433 valves are designed for reliable pressure relief in various industries:

  • Chemical Industry: Protects recycling facilities and waste gas purification systems.
  • Oil and Gas: Ensures safety in upstream and downstream processes with thermal expansion protection.
  • Power Generation: Manages pressure in heat-transfer oil systems and steam applications.
  • Water Treatment: Safeguards pipeline segments and sealed storage tanks.
  • Machine Building: Supports piston compressors and hydraulic systems with pulsating pressures.
Frequently Asked Questions
What fluids can the Type 431/433 handle?

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

Are the Type 431/433 valves suitable for high-pressure applications?

Yes, the PN 160 variant supports pressures up to 160 bar (2321 psig).

What certifications do these valves have?

They are certified to PED, AD 2000-Merkblatt A2, AQSIQ, EAC, and classification societies like LR, RINA, and DNV GL.

Can the valves be customized?

Yes, options include O-ring soft seals, bellows, and metallic sealing plates for specific applications.

How do the valves ensure low maintenance?

The self-draining angle-type body and single-part spindle design reduce residue and corrosion.

Contact Us

For more information about the LESER Type 431/433 Safety Relief Valves, pricing, or to request a demo, contact our team:

Related Products
Product Tags:

Flanged industrial safety valve

  

Medium flow safety relief valve

  

Rolled-in seat safety valve

  
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Flanged Industrial Safety Valve Le-ser Type 431 433 Standard Medium Flow Liquid Pressure Safety Relief Valves with Rolled-in Seat

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