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Flanged Safety Relief Valves

Safety & Pressure Relief Valves

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LESER Series 526 API Safety Relief Valve

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LESER Series 526 API Safety Relief Valve

Inlet Sizes

DN25 - DN200 | 1" - 8"

Pressure Ratings

0.1 - 413.8 Bar | 15 - 6000 PSI
ANSI 150# - ANSI 2500#


WCB, WC6, LCB, CF8M, Duplex, Super Duplex, Hastalloy-C, Monel


ASME VII, CRN, PED, EN ISO 4126-1, TÜV SV 100 and AD 2000-Merkblatt A2

  • Applications

    The API Product Group Represents:

    ✓ Full range of spring loaded safety valves acc. to API 526
    ✓ State-of-the-art design from the safety valve specialist
    ✓ Competitive solutions for the API market

    LESER´s API safety valves:

    • Are designed to meet all applications which require API.
    • Open rapidly with an overpressure of max. 10 % to the full design lift.
    • Have a maximum blowdown of 7 % for steam/gas service and 20% for liquid service.
    • Are developed in a close cooperation with plant engineers and service specialists.
    •  Serve for protection of processes and equipment.
    • Are approved by all important approval organisations worldwide which ensures the worldwide applicability e.g.:
      • European Community: CE-marking acc. to Pressure Equipment Directive (PED) 97 / 23 / EC and EN ISO 4126-1
      • USA: UV-stamp acc. to ASME Section VIII Division 1, National Board certified capacities
      • Germany: VdTÜV approval acc. to PED, EN ISO 4126-1, TÜV SV 100 and AD 2000-Merkblatt A2
      • Canada: Canadian Registration Number acc. to the requirements of particular provinces
      • China: AQSIQ based on the approval acc. to ASME Section VIII Division 1 and AD 2000-Merkblatt A2

    Applicable Industries

    API526 Safety valves present the simple safe solution for heavy duty applications, such as crude oil extraction, transportation and processing in

    • Refineries
    • Chemical industry
    • Petrochemical industry
    • Oil and gas – Onshore and Offshore
    • Vessels and piping systems
    • Blow-down systems
    • Storage tank farms
  • Features

    LESER´s API Safety Valves cover a large variety of types, materials and options to fit any application:

    • Design fully in accordance with API 526 for easy interchangeability
    • Complete API 526 range: valve sizes 1″ through 8″ orifice D through T
    • Materials: WCB, WCC, CF8M, WC6, LCB, LCC, and a wide range of special materials to fulfill the requirements of critical applications
    • Special B3 design for high back pressure applications and material requirements far beyond API Standard
    • Fool proof design with fewer parts for built-in safety
    • Integral cast support brackets for easy handling and safe installation
    • Open or closed bonnet, packed or plain lifting lever or gastight cap
    • Flanged connections according ASME and DIN guarantee a worldwide applicability
    • One design and spring (single trim) for steam, gas and liquid applications reduces the number of spare parts and ensures low cost maintenance management.
    • One-piece spindle reduces friction which leads to high operation accuracy
    • Self-draining body design, avoids residues and reduces corrosion
    • Horizontal installation
  • Options

    LESER API 526 Series safey relief valves can be customized with a great variety of options, e.g.

    • Special connections specified by the customer for optimised adaptation to the plant.
    • Stellited or hardened metal sealing for longer product life
    • Soft seat solutions for superior tightness
    • Balanced bellows for back pressure compensation
    • Heating jackets for applications with high viscosity fluids
    • Any and every part can be produced in special material exactly to meet customer specification requirements
  • Datasheets