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Safety & Pressure Relief Valves


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LESER Series 481 Clean Service Safety Relief Valve

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LESER Series 481 Clean Service Safety Relief Valve

Inlet Sizes

DN15 - DN25 | 1/2" - 1"
(Clamps to ASME, DIN32676/ISO2852 Threaded)

Pressure Ratings

0.1 - 68 bar | 1.5 - 986 psig


-45 to 250 °C | -49 to 482 °F
(in accordance with DIN EN)


PED/ DIN EN ISO 4126-1, PED/ AD 2000-Merkblatt A2, ASME Sec. VIII Div. 1, CRN, AQSIQ, EAC

  • Applications

    LESER – Clean Service Safety Valves

    Designed for small capacity; Type 481 offers protection for installations in which Clean Service properties are required only at the valve inlet, e. g. protection of gas systems for the bottling of beverages.

    Typical applications for LESER Clean Service safety valves are:

    • Food industry
    • Breweries and beverage
    • Pharmaceutical industry
    • Cosmetic industry
    • Chemical industry
    • Special processes
  • Features

    LESER´s Clean Service Safety Valves offer a large variety of types, materials and options to suit any application:

    Scope of design

    • Valve size d0 10 mm
    • Materials: 1.4404 / 316L, 1.4435 / 316L stainless steel as a standard
    • Standard soft seat for superior tightness
    • Packed knob, packed lifting lever, gastight cap or pneumatic lifting devic

    No bacteria traps or contamination due to

    • Minimum dead space design and flushmounting capability
    • Wetted-part surfaces in compliance with European Hygienic Pipes Standard DIN 11866 and ASME BPE
    • Gap and crevice-free design of internals
    • Standard elastomer bellows for protection of the hard to clean parts
    • Self-draining body design, avoids residues and reduces corrosion
    • Use of FDA and USP VI compliant elastomers

    Automatic plant operation during production and cleaning

    • Optional pneumatic lifting device for cleaning in place (CIP) or sterilizing in place (SIP)
    • Optional proximity switch to indicate the operating condition of the valve
    • Self-draining body design and aseptic O-ring disc with bellows (HyTight Assembly) assure a cleanable outlet of the valve

    Ease of plant design, installation and operation

    • Variety of capacities and versions to fit any application
    • Multiple choice of sanitary connections
    • Single trim for steam, gas and liquid for less spare parts and easier maintenance
    • Outlet chamber sealed from bonnet by EPDM bellows
    • Crevice-free fastening of all elastomer parts
    • Exposed, rinsed O-rings
    • No bacteria traps or contamination
  • Options

    LESER – Clean Service Safety Valves can be individually adapted to the operating conditions with accessories, for example:

    • Special connections specified by the customer for optimised adaptation to the plant
    • HyTight Assembly for superior tightness
    • Every part can be replaced by other material acc. customer specification
  • Datasheets