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Flanged Safety Relief Valves

Safety & Pressure Relief Valves

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LESER Series 447 Critical Service Safety Relief Valve

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LESER Series 447 Critical Service Safety Relief Valve

Inlet Sizes

DN25 - DN100 | 1" - 4"

Pressure Ratings

0.1 - 16 Bar | 1.45 - 232 PSI
PN16 | ANSI 150#


-85°C to 200°C


PED, DIN EN ISO 4126-1, ASME VIII, TÜV SV100 and AD 2000-Merkblatt A2, CRN

  • Applications

    LESER – Critical Service Safety Valves

    Provide solutions for protection against highly corrosive and toxic media in all industrial applications with steam, gases, and liquids.

    Typical applications for LESER Critical Service safety valves are:

    • Chlorine production and processing, especially wet chlorine gas
    • Chemical systems and pipelines
    • Reducing media such as acids (e.g. hydrochloric acid,
      acetic acid, etc.)
    • Alkaline solutions (like sodium hydroxide applications)
    • As well as all intermediate products. Intermediate products include amines, dioles, and polyalcohol. They are used, among other things, as raw materials for coatings, plastics, pharmaceuticals, textile fibres, detergents and pesticides.
  • Features

    LESER – Critical Service Safety Valves offer a large variety of types, materials, and options for adaptation to the respective system conditions:

    • Valve sizes from DN 25 to DN 100, 1″ to 4″
    • PTFE use also possible according to ATEX standard through antistatic and electrically conductive PTFE compound
    • Large variety of high alloyed materials for all application ranges:
      – Hastelloy®
      – Inconel®
      – Tantalum
      – Zirconium
      – Titanium
      – Monel®
    • One design and spring for steam, gases and liquids (SingleTrim) reduces the number of required spare parts and facilitates cost-effective maintenance
    • The one-part spindle reduces friction, guarantees optimal guidance and reliable operation under all operating conditions
    • The self-emptying casing avoids media residue and reduces corrosion.
    • Every part can be replaced by other materials according to customer specifications
  • Options

    LESER – Critical Service Safety Valves can be individually adapted to the operating conditions with accessories, for example:

    • Balanced bellows for compensation of the back pressure and to protect the moving parts
    • Lift indicator for detection of opening operations of the safety valve and forwarding the signal to a control room.
  • Datasheets