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product page - LESER Type 481 Clean Service pressure relief valves


TYPE 481

LESER Type 481 Clean Service pressure relief valves
LESER Type 481 Clean Service pressure relief valves



Type 481 LESER Clean Service pressure relief valves are designed, marked, produced and approved according to the requirements of the following regulations:

ce-mark logo


asme logo
EAC logo

Technical Specifications for Type 481

Nominal Diameter at Inlet

DN15 - DN25 | 3/4" - 1"


0.5 x D

Actual Orifice Diameter d₀

10 mm | 0.394 in

Actual Orifice Area A₀

78.5 mm² | 0.122 in²


0.1 - 68 bar | 1.5 - 986 psig

Temperature (in accordance with DIN EN)

-45 to 250 °C | -49 to 482 °F

Body Material

1.4404 | SA 479 316L

Valve Connection

Clamps acc. to ASME BPE, DIN 32676 or ISO 2852 Threaded connection acc. to DIN ISO 228 or ASME B 1.20.1, Aseptic clamps acc. to DIN 11864 T1 Series A or B (with nut) or DIN 11851, Neumo-Sterile thread (with nut)


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


Designed and manufactured acc. to: DIN 11866, ASME BPE, EN 1672-2, DIN ISO 14159, USP class VI and FDA 21 CFR



In our comprehensive download area you will find all necessary documents and detailed information on safety valves you need.

LESER Clean service catalogue
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