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product page - LESER type 447 pressure relief valves


TYPE 447

LESER type 447 pressure relief valves



Type 447 LESER Critical Service pressure relief valves are designed, marked, produced and approved according to the requirements of the following regulations:

ce-mark logo


asme-uv logo
EAC logo

Technical Specifications for Type 447

Nominal Diameter at Inlet

DN 25 - DN 100 | 1" - 4"

Actual Orifice Diameter d₀

23 - 92 mm | 0.91 - 3.62 in

Actual Orifice Area A₀

416 - 6648 mm² | 0.645 - 10.304 in²


0.1 - 16 bar | 1.45 - 232 psig

Flange Rating Inlet

PN 16 | CL150

Temperature (in accordance with DIN EN)

-85 to 200 °C | -121 to 392 °F

Temperature (nach ASME)

-29 to 200 °C | -200 to 392 °F

Body Material

1.0406, 10619, 1.0570 + Virgin PTFE | SA 216 WCB

Valve Connection

Flange acc. to DIN EN 1092-1 or acc. to ASME B 16.5

Bellows Material (optional)


Load Type

Spring loaded


PED/ DIN EN ISO 4126-1, PED/ AD 2000-Merkblatt A2, ASME Section XIII certified for Section VIII Div. 1 service, CRN, AQSIQ, EAC



Access all the necessary documents and detailed information for pressure relief valves in our download area.

LESER criticalo service product catalogue
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