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product page - LESER clean service prerssure relief valves


Pressure relief valves for food, beverage and pharmaceutical applications

LESER clean service prerssure relief valves

Short and uniform delivery times for Clean Service safety valves: Get 155 top runner variants in three weeks. These top runners cover 90% of the supplied Clean Service valves

  • Better cleaning through:

  • Low dead space ratio L/D from up to < 0.33
    HyTight Assembly: gap-free design of the internal parts
    Surfaces packages according to ASME BPE and DIN 11866 with a high surface
    quality up to Ra max = 0.375 µm / 15 µinc

  • Easy process integration through cleaning (CIP) or sterilizing (SIP) with pneumatic lifting device possible

  • Worldwide approvals, FDA-compliant elastomers and a wide range of aseptic connections

  • Alternative to bursting disc



LESER Clean 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

Valve Types

Type 481 >

Small capacity at high set pressure

DN15 - DN25 (3/4" - 1")

Type 483 >

Small to medium capacity, best cleanability and a variety of aseptic connections

DN 25 - DN 40 (1" - 2")

Type 488 >

High capacity, variety of aseptic connections

DN 25 - DN 100 (1" - 4")

Type 485 >

Small to medium capacity, low dead space ratio through weldable integrated pipework connection

Type 484 >

Small to medium capacity, low dead space ratio through weldable vessel connection

Technical Specifications for Clean Service

Nominal Diameter at Inlet

DN 15 - DN 100 | NPS 3/4'' - NPS 4''

Actual Orifice Diameter d₀

10 mm - 92 mm | 0.394 in - 3.622 in

Actual Orifice Area A₀

78.5 mm² - 6648 mm² | 0.122 in² - 10.304 in²


0.1 bar - 68 bar | 1.5 psig - 986 psig

Temperature (in accordance with DIN EN)

-45 °C to 250 °C | -49 °F to 482 °F

Body Material

1.4404, 1.4435 (BN2) | SA 479 316L

Valve Connection

Large Selection of Aseptic Connections: Threaded, Flanged, Clamped, Welded



Load Type




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

LESER clean service catalogue
View or Download
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For ALL LESER Safety Valve enquiries In the United Kingdom - Contact LESER UK​

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