4820-01-266-1320

Find complete technical information, availability, and procurement data for: 4820-01-266-1320
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-266-1320

Item Name Code

05488

Assigment Date

10/21/1987 (38 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.

4 1st end bolt hole quantity, disk flow control device, inside screw bonnet type, 150.0 fahrenheit single response maximum operating temp, bolted 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.

Flow Control Device: disk
Bonnet Type: inside screw
Bonnet Attachment Method: bolted
Bolt Hole Quantity: 4 1st end
Maximum Operating Temp: 150.0 fahrenheit single response
Connection Style: socket with brazing ring (tube) 2nd end
Valve Operation Method: automatic
Flange Shape: round with holes 1st end
Connection Type: flange 1st end
Connection Type: unthreaded internal tube 2nd end
Adjustable Pressure Range: +136.0 to 150.0 pounds per square inch
Maximum Operating Pressure: 250.0 pounds per square inch single response
Nominal Outside Diameter: 4.875 inches 1st end
Nominal Thickness: 0.688 inches 1st end
Bolt Hole Nominal Diameter: 0.750 inches 1st end
Bolt Circle Nominal Diameter: 3.500 inches 1st end
Flange Face Design: plain all ends
Nominal Outside Diameter Tube Accommodated: 1.000 inches 2nd end
Material: copper alloy body
Material: nickel alloy flow control device
Material: nickel alloy seat
Material: nickel alloy stem
Media For Which Designed: gas, inert single 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
2014501S0136	Safety Relief Valve
20145C01S0136	Safety Relief Valve
E20145Q51M	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-266-1320?

The FSCG of the NSN 4820-01-266-1320 is 4820

Does the NSN 4820-01-266-1320 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-266-1320 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 4820-01-266-1320 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-266-1320 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 4820-01-266-1320 was assigned to the Federal Catalog?

It was assigned 38 years ago, on Wed, Oct 21, 1987