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4820-01-239-0177

Safety Relief Valve

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Official Item Classification

Name
Safety Relief Valve
(NSN) National Stock Number
4820-01-239-0177
(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
08/24/1986 (40 years ago)

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

Specs & Compatibility

Flow Control Device

disk

Bonnet Type

inside spring

Bonnet Attachment Method

bolted

Disk Loading Method

spring

Bolt Hole Quantity

8 all ends

Maximum Operating Temp

180.0 fahrenheit single response

Valve Operation Method

automatic

Flange Shape

round with holes all ends

Connection Type

flange all ends

Valve Size

4.000 inches

Adjustable Pressure Range

+45.0 to 70.0 pounds per square inch

Maximum Operating Pressure

300.0 pounds per square inch single response

Nominal Outside Diameter

9.000 inches all ends

Nominal Thickness

0.688 inches all ends

First Connection Face To Centerline Distance

5.812 inches

Bolt Hole Nominal Diameter

0.750 inches all ends

Second Connection Face To Centerline Distance

5.812 inches

Bolt Circle Nominal Diameter

7.500 inches all ends

Flange Face Design

raised straight all ends

Raised Face Nominal Height

0.062 inches all ends

Raised Face Nominal Diameter

6.188 inches all ends

Material

nickel alloy seat

Material Document And Classification

astm b61 assn std single material response body

Material Document And Classification

qq-n-298 fed spec single material response seat

Material Document And Classification

qq-n-288 fed spec single material response stem

Media For Which Designed

water, salt single response

Style Designator

angle flanged ends

Furnished Items And Quantity

1 lever

Regulatory Compliance

Precious Metals Indicator
A

Item does not contain precious metal.

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
C3458 Safety Relief Valve
C3458PL4158-45T70PSI Safety Relief Valve

Frequently Asked Questions

What is the FSCG of the NSN 4820-01-239-0177?
The FSCG of the NSN 4820-01-239-0177 is 4820
Does the NSN 4820-01-239-0177 have a Schedule B code assigned?
Yes, the Schedule B code is 8481400000
Does NSN 4820-01-239-0177 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 4820-01-239-0177 contain precious materials?
Item does not contain precious metal.
Does NSN 4820-01-239-0177 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 4820-01-239-0177 was assigned to the Federal Catalog?
It was assigned 40 years ago, on Sun, Aug 24, 1986