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4820-00-950-5975

Safety Relief Valve

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Official Item Classification

Name
Safety Relief Valve
(NSN) National Stock Number
4820-00-950-5975
(FSG) Federal Supply Group
48 Valves
(FSC) Federal Supply Classification
4820 Nonpowered Valves
(INC) Item Name Code
05488
(FIIG) Federal Item Identification Guide
A046B0
Date
01/01/1962 (64 years ago)

disk flow control device, right-hand 1st end thread direction, 3.000 inches 1st end nominal pipe size accommodated, inside spring bonnet type, threaded bonnet attachment method

Specs & Compatibility

Nominal Pipe Size Accommodated

3.000 inches 1st end

Thread Direction

right-hand 1st end

Flow Control Device

disk

Bonnet Type

inside spring

Bonnet Attachment Method

threaded

Disk Loading Method

spring

Bolt Hole Quantity

4 2nd end

Connection Style

plain,optional end(pipe) 1st end

Valve Operation Method

automatic or manual

Flange Shape

round with holes 2nd end

Connection Type

flange 2nd end

Connection Type

threaded internal pipe 1st end

Features Provided

valve stem lock shield and pressure tight outlet side

Valve Size

2.000 inches

Nominal Thread Size

3.000 inches 1st end

Opening Pressure Setting

12.0 pounds per square inch

Nominal Outside Diameter

6.000 inches 2nd end

Nominal Thickness

0.500 inches 2nd end

First Connection Face To Centerline Distance

4.500 inches

Bolt Hole Nominal Diameter

0.750 inches 2nd end

Second Connection Face To Centerline Distance

2.875 inches

Bolt Circle Nominal Diameter

4.750 inches 2nd end

Flange Face Design

plain 2nd end

Material

copper alloy body

Material

copper alloy flow control device

Material

copper alloy seat

Material

steel stem

Style Designator

angle flanged ends

Thread Series Designator

npt 1st end

Reference Number Differentiating Characteristics

as differentiated by relief pressure rating,and size and type of end connections

Regulatory Compliance

Precious Metals Indicator
U

Precious metal content is unknown

Criticality Code
X

The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Hazardous Metals Indicator
N

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

Pseudo Item Name Code

0005488

Related Hardware Products

Part Number Description
83 Safety Relief Valve

Frequently Asked Questions

What is the FSCG of the NSN 4820-00-950-5975?
The FSCG of the NSN 4820-00-950-5975 is 4820
Does the NSN 4820-00-950-5975 have a Schedule B code assigned?
Yes, the Schedule B code is 8481400000
Does NSN 4820-00-950-5975 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 4820-00-950-5975 contain precious materials?
Precious metal content is unknown
Does NSN 4820-00-950-5975 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 4820-00-950-5975 was assigned to the Federal Catalog?
It was assigned 64 years ago, on Mon, Jan 1, 1962