"> Emerson Marine Fisher PV DN400 2450mbar
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Emerson Marine

Fisher PV DN400 2450mbar

Emerson Marine Fisher PV DN400 2450mbar is identified in the source list as a pressure/vacuum relief valve (pv valve). It is installed on cargo-tank vent piping, normally on the weather deck or at a designated vent mast or riser location. Its purpose is to control cargo-tank pressure and vacuum and, for high-velocity valves, discharge vapor in the approved manner during loading, discharge and thermal breathing. The source record provides no additional model-specific operating figure beyond the listed designation and category. Valve seat, pallet or spring arrangement, flame-protection features where applicable, weather protection and process connection form the venting device. The exact model designation distinguishes pressure-vacuum function, flow capacity, material and approval from neighboring vent valves; refer to the manufacturer documentation for the exact figure.

Components & Design

Component data being added…

Technical Data

nominal diameter dn 400
set pressure mbar 2450
vacuum mbar -350
material SS316

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Common failures & inspection points

●Valve sticking caused by cargo residues, corrosion or salt deposits, resulting in abnormal tank pressure or failure to reseat
●Seat or seal damage caused by wear, contamination or mechanical impact, resulting in continuous vapor leakage or inability to hold normal pressure
●Flame screen or flow path blockage where fitted caused by dirt, paint or corrosion, resulting in restricted venting and rising tank pressure
●Spring, pallet or mechanism deterioration caused by corrosion or fatigue, resulting in incorrect opening behavior or chatter
●Heating or anti-icing failure where fitted caused by electrical or steam faults, resulting in icing and restricted venting in cold service

Service & Maintenance

Inspect valve body, seat, pallet or spring mechanism, weather cap, flame-protection parts and drain paths for corrosion, deposits and free movement. Keep vents free of paint and cargo residue and do not add unapproved screens or covers. Function-test opening and reseating using the approved workshop or onboard method. Check heating or anti-icing arrangements where fitted. Verify the valve remains matched to the approved cargo-tank vent system after replacement. Refer to the manufacturer documentation for the exact figure for opening pressure, vacuum setting, test flow and service limits.

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Replacement Parts

Keep approved seat seals, gaskets, springs or pallets where serviceable, heating elements or tracing parts where fitted and manufacturer-recommended repair kits. Complete spare valves may be appropriate for critical tanker service. Replacement parts must preserve type approval and material compatibility.
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Equipment Model #103371 · ✓ still in production