LESER Compact Performance Safety Valve Type 437

Compact PerformanceType 437

Safety valves for protection of small capacities. Technical data

  • Matching selection of threaded and flanged connections with a delivery time of 2 weeks


  • CE_Europa_schwarz
  • VdTUEV
  • ASME_UV_USA_schwarz
  • EAC_Russland_schwarz
  • TS_Logo_China_schwarz
  • UKCA_Grossbritanien_schwarz
  • CRN_Kanada_schwarz
  • Bureau-Veritas
  • DNV
  • RINA-1861
  • Vogel
  • LloydsRegister
  • CCS_Logo_China_SW
  • Korean-Register
  • Class-NK

Applications & Industries

  • Chemistry
  • Oil & Gas
  • Petrochemical
  • Energy
  • Technical gases
  • LNG & LPG
  • Shipbuilding
  • Other industries

The optimal solution for:

  • Compressors and pumps
  • Technical gases and CO2 plants
  • LPG/LNG storage tanks, transporters (ship, truck, etc.)
  • Pressure vessels and piping systems carrying vapors, gases and fluids
  • Refrigeration and oxygen applications
  • Thermal expansion


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Technical features Type 437

Set pressure (according to ASME) 0.1 - 365 bar | 1.5 - 5,294 psig
Set pressure (according to CE) 0.1 - 365 bar | 1.5 - 5,294 psig
Temperature(according to ASME) -270 to 280 °C | -454 to 536 °F
Temperature (according to CE) -268 to 280 °C | -450 to 536 °F
Capacity B+ to C
Connections DIN EN 1092 G/R: NPS 3/8 to NPS 1 | DN 15 - DN 25
Connections ASME B16.5 NPT: NPS 1/2 to NPS 1 | NPS 1/2 to NPS 1
Flange class Inlet DIN EN 1092 PN 40 - PN 400
Flange class Inlet ASME B16.5 Class 150 - Class 2500
Body material 1.4104, 1.4404 | SA 479 430, SA 479 316L
Narrowest flow diameter d₀ 6 - 10 mm | 0.236 - 0.394 in
Narrowest flow area A₀ 28.3 - 78.5 mm² | 0.044 - 0.122 in²
Seat gasket Metallic


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Sizing and selection

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