199 1/2X 1.5IN.

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-266-3639

Item Name Code

05487

Assigment Date

10/23/1987 (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.

-20.0 fahrenheit 1st response maximum operating temp, weight disk loading method, disk flow control device, 100.0 fahrenheit 2nd response maximum operating temp, 4 all ends bolt hole quantity

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
Disk Loading Method: weight
Bolt Hole Quantity: 4 all ends
Maximum Operating Temp: -20.0 fahrenheit 1st response
Maximum Operating Temp: 100.0 fahrenheit 2nd response
Valve Operation Method: automatic
Flange Shape: round with holes all ends
Connection Type: flange all ends
Mounting Position: horizontal or vertical
Valve Size: 1.500 inches
Maximum Operating Pressure: 3705.0 pounds per square inch single response
Nominal Outside Diameter: 3.750 inches 2nd end
Nominal Outside Diameter: 6.125 inches 1st end
Face To Face Distance: 12.000 inches
Nominal Thickness: 0.562 inches 2nd end
Nominal Thickness: 0.875 inches 1st end
Bolt Hole Nominal Diameter: 0.500 inches 2nd end
Bolt Hole Nominal Diameter: 0.750 inches 1st end
Bolt Circle Nominal Diameter: 2.625 inches 2nd end
Bolt Circle Nominal Diameter: 4.500 inches 1st end
Flange Face Design: raised straight all ends
Raised Face Nominal Height: 0.250 inches all ends
Raised Face Nominal Diameter: 1.375 inches 2nd end
Raised Face Nominal Diameter: 2.875 inches 1st end
Material: steel overall
Style Designator: straight thru flanged 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
199 1/2X 1.5IN.	Check Valve
B42577-H	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-01-266-3639?

The FSCG of the NSN 4820-01-266-3639 is 4820

Does the NSN 4820-01-266-3639 have a Schedule B code assigned?

Yes, the Schedule B code is 8481302090

Does NSN 4820-01-266-3639 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 4820-01-266-3639 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-266-3639 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 4820-01-266-3639 was assigned to the Federal Catalog?

It was assigned 38 years ago, on Fri, Oct 23, 1987