LESER - Critical Service Safety Valve
LESER - Critical Service Safety Valve
Model: 447 / 449 / 546 / 5466
Body Material: Ductile Iron / WCB
End Connection: RF Flanged End

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LESER Critical Service Safety Valves … … combine safety valve know-how with a level-based PTFE equipment and lining concept. All components of Critical Service safety valves are made with PTFE-lined materials, including the permanently medium wetted inlet area composed of a nozzle and a disc, the additional protection of the bonnet area by means of a bellows and all components of the inlet and outlet areas. • Designed and manufactured according to the highest standards • Reach their full lift within a pressure increase of 10% above the set pressure • Are characterised by longstanding proof in service. • Are developed and optimised in close cooperation with plant engineers and service specialists to protect processes with highly corrosive and toxic media. • Meet the highest requirements of end customers, OEMs and planners. • Are approved by all important classification societies worldwide. This ensures the worldwide applicability of LESER Critical Service safety valves. • Designed in accordance with numerous regulations, labelled, produced and approved in accordance with: CE marking in accordance with Pressure Equipment Directives 97/23/EC and DIN EN ISO 4126-1 UV stamp as per ASME Section VIII Division 1 VdTÜV approval as per the Pressure Equipment Directive, EN ISO 4126-1, TÜV SV 100 and AD 2000-Merkblatt A2 AQSIQ based on the approvals acc. to AD 2000-Merkblatt A2 Eurasian Custom Union: as per EAC - Eurasian Conformity



  • PTFE parts in different designs for optimized resistance to highly-corrosive media
  • Economical alternative to high-alloyed materials
  • Carrier gas blanketing using double-walled pipes is possible


Nominal Diameter at Inlet DN 25 - DN 100 | 1" - 4"
Orifice E - N | E - N
Actual Orifice Diameter d0 23 mm - 92 mm | 0.91 in - 3.62 in
Actual Orifice Area A0 415 mm² - 6.648 mm² | 0.645 in² - 10.304 in²
Pressure 0.1 bar - 16 bar | 1.45 psig - 232 psig
Temperature -85 °C to 200 °C | -121 °F to 392 °F
Body Material 0.7043, 1.0460, 1.0619, 1.4404 | Ductile Gr. 60-40-18, Sa 216 WCB, 316L
Valve Connection Flange in accordance with DIN EN 1092-1 and ASME B 16.5
Bellows Stainless steel, PTFE
Load Type Spring loaded



  • Chemical Industry (Chlorine manufacture and processing; Chemical plants and pipelines; Reduced media such as acids or lyes)

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