NMP402

View detailed technical data, stock status, and sourcing information for: NMP402
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-287-2615

Item Name Code

05488

Assigment Date

01/01/1963 (63 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 2nd end bolt hole quantity, threaded renewable seat ring type, automatic valve operation method, disk flow control device, spring disk loading 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
Disk Loading Method: spring
Renewable Seat Ring Type: threaded
Bolt Hole Quantity: 4 2nd end
Valve Operation Method: automatic
Flange Shape: round 1st end
Flange Shape: round with holes 2nd end
Connection Type: flange all ends
Nominal Outside Diameter: 3.500 inches all ends
Nominal Thickness: 0.438 inches all ends
Bolt Hole Nominal Diameter: 0.625 inches 2nd end
Bolt Circle Nominal Diameter: 2.375 inches 2nd end
Flange Face Design: raised straight all ends
Raised Face Nominal Height: 0.062 inches 2nd end
Raised Face Nominal Height: 0.062 inches 1st end
Raised Face Nominal Diameter: 1.375 inches 1st end
Raised Face Nominal Diameter: 1.375 inches 2nd end
Material: copper alloy body
Material: copper alloy flow control device
Material: copper alloy seat
Material: copper alloy stem
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
LL3110B	Safety Relief Valve
NMP0902B01S0018	Safety Relief Valve
NMP402	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-287-2615?

The FSCG of the NSN 4820-00-287-2615 is 4820

Does the NSN 4820-00-287-2615 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-287-2615 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 4820-00-287-2615 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-287-2615 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 4820-00-287-2615 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963