LESER High Performance Safety Valve Type 441 442 ANSI

High PerformanceType 441, 442 ANSI

Full lift safety valve with rolled in seat , ASME flanged connections. Technical data

  • Delivery times: 2 weeks for standard configurations
  • Carbon steel and stainless steel casting


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

Applications & Industries

All industries up to 49.3 barg / 715 psig

The optimal solution for:

  • Pressure relief within 5% pressure increase
  • Common in steam and gas applications up to 49.3 barg / 715 psig
  • Nominal sizes up to NPS 16
  • High required mass flows
  • Easy maintenance


LGE ATLAS Copco_inv DOW Chemical_inv

Technical features type 441, 442 ANSI

Set pressure(according to CE) 0.1 - 49 barg | 1.5 - 710 psig
Set pressure (according to ASME) 1.03 - 49.3 barg | 15 - 715 psig
Temperature(according to CE) -270 to 450 °C | -454 to 842 °F
Temperature(according to ASME) -268 to 538 °C | -450 to 1,000 °F
Capacity orifice F- to X
Connections ASME B16.5 NPS 3/4 to NPS 16
Flange class Inlet DIN EN 1092 PN 10 - PN 40
Flange class Inlet ASME B16.5 Class 150 - Class 300
Body material 1.0619, 1.4408 | SA 216 WCB, SA 351 CF8M
Narrowest flow diameter d₀ 23 - 295 mm | 0.91 - 11.61 in
Narrowest flow area A₀ 416 - 68,347 mm² | 0.644 - 105.938 in²
Bellows material Stainless steel and elastomer
Seat gasket Metallic, Sealing plate , Soft sealing
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Sizing and selection

Sizing and selection of your LESER Safety valve with VALVESTAR® - The Sizing Program

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