NSN 4820-00-287-4264

Velocity Fuse

About this product

0.500 inches 2nd end pipe size accommodated, poppet flow control device, exposed spring bonnet type, bonnet attachment method: threaded.

Manufacturer part number 214-4900-799254PCV780 for national stock number 4820002874264.


  • Product description

    Safety Relief Valve NSN 4820-00-287-4264.

  • MPN or Model


  • Schedule B
    8481.40.0000 (Safety or relief valves)
  • NMF (National Motor Freight)
    127220 - Pressure Reg/red/relief Valves NOI
  • Pipe Size Accommodated
    0.500 inches 2nd end
  • Thread Direction
    Right-hand 1st end
  • Flow Control Device
  • Bonnet Type
    Exposed spring
  • Bonnet Attachment Method
  • Disk Loading Method
  • Renewable Seat Ring Type
    Retaining screw
  • Maximum Operating Temp
    550.0 degrees fahrenheit single response
  • Connection Style
    Plain, optional en (pipe) 1st end
  • Valve Operation Method
    Automatic or manual
  • Connection Type
    Threaded internal pipe 1st end
  • Features Provided
    Valve stem lock shield and pressure tight outlet side
  • Maximum Operating Pressure
    250.0 pounds per square inch single response
  • Thread Size
    0.500 inches 2nd end
  • Opening Pressure Setting
    250.0 pounds per square inch
  • Material
    Nickel alloy flow control device
  • Media For Which Designed
    Steam single response
  • Style Designator
  • Thread Series Designator
    Npt 1st end
More from these suppliers
Safety Relief Valve

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes valve (1), relief, pressure and temperature.

Mechanic Bill explains Velocity Fuse

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NSN 4820002874264

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
214-4900-799254PCV780 Naval Sea Systems Command
271-4900-957265PCV780 Naval Sea Systems Command
319-4900-1188487PCV904 Naval Sea Systems Command
346-4900-484711PCV782 Naval Sea Systems Command
389588PCV780 Naval Sea Systems Command
533115PCV782 Naval Sea Systems Command
571-3801-1302581PCV3 Naval Sea Systems Command
340-4900-1000937PVC5 Naval Ship Systems Command
3664-33PCV3 Electric Boat Corporation
44-1-2-176-250 Lunkenheimer Co
533115PCV782 Naval Ship Systems Command
571-3801-1302581PCV3 Naval Ship Systems Command
214-4900-799254PCV780 Naval Ship Systems Command
271-4900-957265PCV780 Naval Ship Systems Command
319-4900-1188487PCV904 Naval Ship Systems Command
346-4900-484711PCV782 Naval Ship Systems Command
389588PCV780 Naval Ship Systems Command
2076-16PCV780 Electric Boat Corporation
2476-16PCV782 Electric Boat Corporation
2776-23PCV782 Electric Boat Corporation
3376-12PCV904 Electric Boat Corporation
Stock Check
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