4820-01-078-4788

Find complete technical information, availability, and procurement data for: 4820-01-078-4788
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-078-4788

Item Name Code

10958

Assigment Date

06/14/1979 (47 years ago)

A valve consisting of a single deadweight loaded disk, or two deadweight loaded disks each with a seperate seat. It is specifically designed for the relief of small pressure and vacuum conditions within a tank or other container to or from the atmosphere. The center of a single deadweight loaded disk may contain a spring loaded disk forming an additional seat or aperture. It may be spring loaded and/or equipped with a manual unloader on either the pressure or vacuum side. Exclude valve, vacuum breaking.

threaded external tube first end connection type, 45.0 pounds per square inch maximum operating pressure, gas media for which designed, straight thru body style, flared first end style designator

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Maximum Operating Pressure: 45.0 pounds per square inch
Body Style: straight thru
Media For Which Designed: gas
First End Connection Type: threaded external tube
First End Style Designator: flared
First End Outside Diameter Tube Accommodated: 0.500 inches nominal
First End Thread Direction: right-hand
Second End Relationship With First End: not identical
Second End Connection Type: unthreaded internal hose
Second End Style Designator: hose socket
Second End Inside Diameter Hose Accommodated: 0.250 inches nominal
Second End Outside Diameter Hose Accommodated: 0.250 inches minimum and 0.437 inches maximum
Flow Control Device: needle
End Connection Quantity: 2
First End Thread Pitch Diameters: +0.5976 to 0.5978 inches
Valve Venting Design Type: atmospheric
Valve Relief Design Type: pressure and vacuum
End Item Identification: used on master gyro compass mk 27 mod 1 system onboard various coast guard vessels
First End Thread Series Designator: unef
First End Nominal Thread Size: 0.625 inches
First End Thread Tolerance Class: 3a external
Material: steel body

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
1853332	Gaseou Pressure Equalizing Valve

FAQs

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

What is the FSCG of the NSN 4820-01-078-4788?

The FSCG of the NSN 4820-01-078-4788 is 4820

Does the NSN 4820-01-078-4788 have a Schedule B code assigned?

Yes, the Schedule B code is 8481809050

Does NSN 4820-01-078-4788 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 4820-01-078-4788 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-078-4788 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 4820-01-078-4788 was assigned to the Federal Catalog?

It was assigned 47 years ago, on Thu, Jun 14, 1979