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4820-00-820-6781

Find complete technical information, availability, and procurement data for: 4820-00-820-6781

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4820-00-820-6781
Federal Supply Group
Valves
Federal Supply Classification
4820 Nonpowered Valves
National Stock Number
4820-00-820-6781
Item Name Code
05488
Assigment Date
01/01/1962 (64 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.

poppet flow control device, right-hand all ends thread direction, inside spring bonnet type, 3a all ends thread class, integral bonnet attachment method

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
Bonnet Type
inside spring
Bonnet Attachment Method
integral
Disk Loading Method
spring
Connection Style
flared (tube) all ends
Valve Operation Method
automatic
Connection Type
threaded external tube all ends
Thread Quantity Per Inch
12 all ends
Adjustable Pressure Range
+115.0 to 250.0 pounds per square inch
Nominal Thread Size
1.500 inches all ends
Seat Angle
37.0 degrees all ends
Nominal Outside Diameter Tube Accommodated
0.750 inches all ends
Material
steel corrosion resisting body
Material
steel corrosion resisting flow control device
Material
steel corrosion resisting seat
Style Designator
angle
Thread Series Designator
un all ends

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number Name
644XB4-12-11 Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-820-6781?
The FSCG of the NSN 4820-00-820-6781 is 4820
Does the NSN 4820-00-820-6781 have a Schedule B code assigned?
Yes, the Schedule B code is 8481400000
Does NSN 4820-00-820-6781 require demilitarization?
Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.
Does NSN 4820-00-820-6781 contain precious materials?
Precious metal content is unknown
Does NSN 4820-00-820-6781 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 4820-00-820-6781 was assigned to the Federal Catalog?
It was assigned 64 years ago, on Mon, Jan 1, 1962

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