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NSN 4820-01-449-8123

Velocity Fuse

About this product

Disk flow control device, inside spring bonnet type, integral bonnet attachment method, disk loading method: spring.

Manufacturer part number 644XB-4-12-2 for national stock number 4820014498123.

Datasheet

  • Product description

    Safety Relief Valve NSN 4820-01-449-8123.

  • MPN or Model

    644XB-4-12-2

  • Schedule B
    8481.40.0000 (Safety or relief valves)
  • NMF (National Motor Freight)
    051080 - Faucets, Bibcocks, Gates Valves
  • Unit Weight (Est.)
    2.1 lb
  • Thread Class
    3a all ends
  • Thread Direction
    Right-hand all ends
  • Flow Control Device
    Disk
  • Bonnet Type
    Inside spring
  • Bonnet Attachment Method
    Integral
  • Disk Loading Method
    Spring
  • Maximum Operating Temp
    250.0 degrees fahrenheit single response
  • End Application
    Aircraft, awacs, e-3a
  • Connection Style
    G43 external seat for gasket seal (boss) all ends
  • Valve Operation Method
    Automatic
  • Connection Type
    Threaded external boss all ends
  • Thready Qty Per Inch (tpi)
    12 all ends
  • Adjustable Pressure Range
    +115.0/+250.0 pounds per square inch
  • Maximum Operating Pressure
    3600.0 pounds per square inch single response
  • Thread Size
    1.062 inches all ends
  • Seat Angle
    37.0 degrees all ends
  • Material
    Stainless steel flow control device
  • Media For Which Designed
    Water-oil-gas single response
  • Style Designator
    Err-090
  • Thread Series Designator
    Un all ends
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 4820014498123

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
644XB-4-12-2 Parker-hannifin Corporation
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