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4820-00-252-4852

Safety Relief Valve

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Official Item Classification

Name
Safety Relief Valve
(NSN) National Stock Number
4820-00-252-4852
(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
01/13/1972 (54 years ago)

threaded renewable seat ring type, spring disk loading method, bolted bonnet attachment method, disk flow control device, exposed spring bonnet type

Specs & Compatibility

Flow Control Device

disk

Bonnet Type

exposed spring

Bonnet Attachment Method

bolted

Disk Loading Method

spring

Renewable Seat Ring Type

threaded

Bolt Hole Quantity

4 1st end

Bolt Hole Quantity

4 2nd end

Valve Operation Method

automatic or manual

Flange Shape

round with holes 1st end

Flange Shape

round with holes 2nd end

Connection Type

flange 1st end

Connection Type

flange 2nd end

Features Provided

pressure tight outlet side

Valve Size

1.500 inches

Opening Pressure Setting

675.0 pounds per square inch

Nominal Outside Diameter

6.125 inches 2nd end

Nominal Outside Diameter

7.500 inches 1st end

Nominal Thickness

0.688 inches 1st end

Nominal Thickness

0.875 inches 2nd end

First Connection Face To Centerline Distance

5.718 inches

Bolt Hole Nominal Diameter

0.750 inches 1st end

Bolt Hole Nominal Diameter

0.875 inches 2nd end

Second Connection Face To Centerline Distance

6.938 inches

Bolt Circle Nominal Diameter

4.500 inches 2nd end

Bolt Circle Nominal Diameter

6.000 inches 1st end

Flange Face Design

plain 2nd end

Flange Face Design

raised straight 1st end

Raised Face Nominal Height

0.062 inches 1st end

Raised Face Nominal Diameter

5.000 inches 1st end

Material

steel corrosion resisting flow control device

Material

steel corrosion resisting seat

Style Designator

angle flanged ends

Reference Number Differentiating Characteristics

as differentiated by the opening pressure setting requirement

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
5VMA72 Safety Relief Valve
5VMA72 M0D Safety Relief Valve
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Frequently Asked Questions

What is the FSCG of the NSN 4820-00-252-4852?
The FSCG of the NSN 4820-00-252-4852 is 4820
Does the NSN 4820-00-252-4852 have a Schedule B code assigned?
Yes, the Schedule B code is 8481400000
Does NSN 4820-00-252-4852 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 4820-00-252-4852 contain precious materials?
Precious metal content is unknown
Does NSN 4820-00-252-4852 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 4820-00-252-4852 was assigned to the Federal Catalog?
It was assigned 54 years ago, on Thu, Jan 13, 1972