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4820-01-171-4391

Find complete technical information, availability, and procurement data for: 4820-01-171-4391

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4820-01-171-4391
Federal Supply Group
Valves
Federal Supply Classification
4820 Nonpowered Valves
National Stock Number
4820-01-171-4391
Item Name Code
05487
Assigment Date
02/07/1984 (42 years ago)

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.

right-hand all ends thread direction, poppet flow control device, 3a all ends thread class, spring disk loading method, external seat for gasket seal (boss) 2nd end connection style

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class
3a all ends
Thread Direction
right-hand all ends
Flow Control Device
poppet
Disk Loading Method
spring
Connection Style
external seat for gasket seal (boss) 2nd end
Connection Style
plain (tube) 1st end
Valve Operation Method
automatic
Connection Type
threaded external boss 2nd end
Connection Type
threaded external tube 1st end
Mounting Position
horizontal or vertical
Thread Quantity Per Inch
20 2nd end
Maximum Operating Pressure
-65.0 pounds per square inch 1st response
Maximum Operating Pressure
450.0 pounds per square inch 2nd response
Nominal Thread Size
0.438 inches 1st end
Nominal Thread Size
0.563 inches 2nd end
Seat Angle
45.0 degrees 1st end
Material
steel corrosion resisting body
Material
steel flow control device
Media For Which Designed
fuel/oil, hydrocarbon single response
Style Designator
straight thru
Thread Series Designator
unjf 1st end
Thread Series Designator
unjs 2nd end

Related Parts

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Part Number Name
4C2640 Check Valve
4C2640-1 Check Valve
ST7M260-4 Check Valve

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4820-01-171-4391?
The FSCG of the NSN 4820-01-171-4391 is 4820
Does the NSN 4820-01-171-4391 have a Schedule B code assigned?
Yes, the Schedule B code is 8481302090
Does NSN 4820-01-171-4391 require demilitarization?
Usml items - mutilation to the point of scrap required worldwide. (note 7).
Does NSN 4820-01-171-4391 contain precious materials?
Item does not contain precious metal.
Does NSN 4820-01-171-4391 contain hazardous materials?
Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.
When the NSN 4820-01-171-4391 was assigned to the Federal Catalog?
It was assigned 42 years ago, on Tue, Feb 7, 1984

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