4820-01-321-1790

Find complete technical information, availability, and procurement data for: 4820-01-321-1790
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-321-1790

Item Name Code

05488

Assigment Date

06/13/1990 (36 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.

inside screw bonnet type, threaded bonnet attachment method, 4 1st end bolt hole quantity, 0.750 inches 2nd end nominal pipe size accommodated, disk flow control device

Product Characteristics

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

Nominal Pipe Size Accommodated: 0.750 inches 2nd end
Flow Control Device: disk
Bonnet Type: inside screw
Bonnet Attachment Method: threaded
Bolt Hole Quantity: 4 1st end
Maximum Operating Temp: 150.0 fahrenheit 1st response
Maximum Operating Temp: 425.0 fahrenheit 2nd response
Connection Style: socket 2nd end
Valve Operation Method: automatic
Flange Shape: round with holes 1st end
Connection Type: flange 1st end
Connection Type: unthreaded internal pipe 2nd end
Maximum Operating Pressure: 200.0 pounds per square inch 2nd response
Maximum Operating Pressure: 400.0 pounds per square inch 1st response
Opening Pressure Setting: 200.0 pounds per square inch
Nominal Outside Diameter: 4.312 inches 1st end
Nominal Thickness: 0.688 inches 1st end
Bolt Hole Nominal Diameter: 0.562 inches 1st end
Bolt Circle Nominal Diameter: 3.188 inches 1st end
Flange Face Design: plain 1st end
Material: bronze body
Material: bronze flow control device
Material: copper alloy stem
Material: nickel alloy seat
Media For Which Designed: air 1st response
Media For Which Designed: steam 2nd response
Media For Which Designed: water, fresh 3rd response
Style Designator: angle

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
NMP121-3/4IN-L2	Safety Relief Valve
NMP121-3/4IN-L2122C-200 PSI	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-321-1790?

The FSCG of the NSN 4820-01-321-1790 is 4820

Does the NSN 4820-01-321-1790 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-321-1790 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 4820-01-321-1790 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-321-1790 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 4820-01-321-1790 was assigned to the Federal Catalog?

It was assigned 36 years ago, on Wed, Jun 13, 1990