NMP251

View detailed technical data, stock status, and sourcing information for: NMP251
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-006-1394

Item Name Code

05488

Assigment Date

07/14/1975 (51 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.

8 all ends bolt hole quantity, spring disk loading method, disk flow control device, union bonnet attachment method, inside spring bonnet type

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 spring
Bonnet Attachment Method: union
Disk Loading Method: spring
Bolt Hole Quantity: 8 all ends
End Item Identification: marine hardware and hull doors
Valve Operation Method: automatic
Flange Shape: round with holes all ends
Connection Type: flange all ends
Valve Size: 3.000 inches
Maximum Operating Pressure: 100.0 kilograms per square centimeter single response
Opening Pressure Setting: 60.0 pounds per square inch
Nominal Outside Diameter: 6.625 inches all ends
Nominal Thickness: 0.500 inches all ends
First Connection Face To Centerline Distance: 6.250 inches
Bolt Hole Nominal Diameter: 0.562 inches all ends
Second Connection Face To Centerline Distance: 5.500 inches
Bolt Circle Nominal Diameter: 5.500 inches all ends
Flange Face Design: plain all ends
Material: copper alloy body
Material: nickel alloy flow control device
Material: nickel alloy seat
Material: nickel alloy stem
Style Designator: angle 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
BAMGG05IK	Safety Relief Valve
BAMGG05IKK	Safety Relief Valve
D506LFF-3IN-60PSI	Safety Relief Valve
D50FF-05-3X3	Safety Relief Valve
LL2210C3INSET60P	Safety Relief Valve
NMP251	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-006-1394?

The FSCG of the NSN 4820-01-006-1394 is 4820

Does the NSN 4820-01-006-1394 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-006-1394 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 4820-01-006-1394 contain precious materials?

Precious metal content is unknown

Does NSN 4820-01-006-1394 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 4820-01-006-1394 was assigned to the Federal Catalog?

It was assigned 51 years ago, on Mon, Jul 14, 1975