NMP405

View detailed technical data, stock status, and sourcing information for: NMP405

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NMP405
Federal Supply Group
Valves
Federal Supply Classification
4820 Nonpowered Valves
National Stock Number
4820-00-273-9431
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.

disk flow control device, inside spring bonnet type, union bonnet attachment method, threaded renewable seat ring type, 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
Bonnet Type
inside spring
Bonnet Attachment Method
union
Disk Loading Method
spring
Renewable Seat Ring Type
threaded
Bolt Hole Quantity
4 all ends
Maximum Operating Temp
650.0 fahrenheit single response
Valve Operation Method
automatic
Flange Shape
round with holes all ends
Connection Type
flange all ends
Features Provided
pressure tight outlet side
Valve Size
1.250 inches
Adjustable Pressure Range
+51.0 to 70.0 pounds per square inch
Maximum Operating Pressure
200.0 pounds per square inch single response
Nominal Outside Diameter
4.500 inches all ends
Nominal Thickness
0.438 inches all ends
First Connection Face To Centerline Distance
4.250 inches
Bolt Hole Nominal Diameter
0.562 inches all ends
Second Connection Face To Centerline Distance
5.000 inches
Bolt Circle Nominal Diameter
3.375 inches all ends
Flange Face Design
plain all ends
Material
steel body
Material
steel corrosion resisting seat
Material
steel corrosion resisting stem
Material
steel flow control device
Material Document And Classification
mil-s-867,class3 mil spec single material response flow control device
Media For Which Designed
steam 1st response
Media For Which Designed
water-oil-gas 2nd response
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
1-1/4IN LL3110B Safety Relief Valve
NMP405 Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-273-9431?
The FSCG of the NSN 4820-00-273-9431 is 4820
Does the NSN 4820-00-273-9431 have a Schedule B code assigned?
Yes, the Schedule B code is 8481400000
Does NSN 4820-00-273-9431 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 4820-00-273-9431 contain precious materials?
Precious metal content is unknown
Does NSN 4820-00-273-9431 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 4820-00-273-9431 was assigned to the Federal Catalog?
It was assigned 63 years ago, on Tue, Jan 1, 1963

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