NSN 4820-00-580-6431
Velocity Fuse
About this product
0.250 inches 1st end pipe size accommodated, poppet flow control device, spring disk loading method, valve discharge flow rate: 6.0 cubic feet per minute.
Manufacturer part number 559T2M20 for national stock number 4820005806431.
Datasheet
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Product description
Safety Relief Valve NSN 4820-00-580-6431.
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MPN or Model
559T2M20
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Schedule B
8481.40.0000 (Safety or relief valves) -
NMF (National Motor Freight)
127220 - Pressure Reg/red/relief Valves NOI -
Pipe Size Accommodated
0.250 inches 1st end -
Thread Direction
Right-hand 1st end -
Flow Control Device
Poppet -
Disk Loading Method
Spring -
Valve Discharge Flow Rate
6.0 cubic feet per minute -
Maximum Operating Temp
250.0 degrees fahrenheit single response -
Connection Style
Plain (pipe) 1st end -
Valve Operation Method
Automatic -
Connection Type
Threaded external pipe 1st end -
Features Provided
Valve stem lock shield -
Thready Qty Per Inch (tpi)
18 1st end -
Maximum Operating Pressure
200.0 pounds per square inch single response -
Thread Size
0.250 inches 1st end -
Opening Pressure Setting
20.0 pounds per square inch -
Material
Stainless steel seat -
Media For Which Designed
Fuel/oil, hydrocarbon single response -
Style Designator
Straight thru -
Thread Series Designator
Npt 1st end
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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](/public/images/billy-thinking.png)
Pricing and Availability
Get a quote for 4820-00-580-6431 safety relief valveManufacturer Part Numbers and Alternates
MPN manufacturer part number | Registrant or Supplier |
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559T2M20 | Circor Aerospace, Inc. |
381-1040PC2 | Raytheon Co Equipment Development |
Stock Check
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