NSN 4820-01-011-6579
Velocity Fuse
About this product
Poppet flow control device, spring disk loading method, 2.5 gallons per minute valve discharge flow rate, connection style: g42 flared (tube) all ends.
Manufacturer part number 649XB2-4-2 for national stock number 4820010116579.
Datasheet
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Product description
Safety Relief Valve NSN 4820-01-011-6579.
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MPN or Model
649XB2-4-2
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Schedule B
8481.40.0000 (Safety or relief valves) -
NMF (National Motor Freight)
127220 - Pressure Reg/red/relief Valves NOI -
Unit Weight (Est.)
0.6 lb -
Thread Class
3a all ends -
Thread Direction
Right-hand all ends -
Flow Control Device
Poppet -
Disk Loading Method
Spring -
Valve Discharge Flow Rate
2.5 gallons per minute -
Maximum Operating Temp
225.0 degrees fahrenheit single response -
Connection Style
G42 flared (tube) all ends -
Valve Operation Method
Automatic -
Connection Type
Threaded external tube all ends -
Adjustable Pressure Range
+10.0/+50.0 pounds per square inch -
Maximum Operating Pressure
50.0 pounds per square inch single response -
Thread Size
0.438 inches all ends -
Seat Angle
37.0 degrees all ends -
Opening Pressure Setting
35.0 pounds per square inch -
Outside Diameter Tube Accommodated
0.250 inches all ends -
Material
Steel comp 303 flow control device -
Material Specification
Fed standard 66, aisi 303/sae 30303 federal standard single material response flow control device -
Media For Which Designed
Fuel/oil, hydrocarbon 1st response -
Surface Treatment
Passivate -
Style Designator
Err-090 -
Thread Series Designator
Unjf all ends
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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 4820-01-011-6579 safety relief valveManufacturer Part Numbers and Alternates
MPN manufacturer part number | Registrant or Supplier |
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649XB2-4-2 | Teledyne Industries Inc |
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