D559A-4D-3

View detailed technical data, stock status, and sourcing information for: D559A-4D-3
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-019-4650

Item Name Code

05488

Assigment Date

04/15/1976 (50 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.

poppet flow control device, 3a 1st end thread class, right-hand 1st end thread direction, 280.0 fahrenheit single response maximum operating temp, 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.

Thread Class: 3a 1st end
Thread Direction: right-hand 1st end
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: 280.0 fahrenheit single response
Minimum Operating Temp: -40.0 fahrenheit
Connection Style: plain (tube) 1st end
Valve Operation Method: automatic
Connection Type: threaded external tube 1st end
Maximum Operating Pressure: 200.0 pounds per square inch single response
Nominal Thread Size: 0.438 inches 1st end
Opening Pressure Setting: 3.0 pounds per square inch
Material: aluminum alloy 2024 overall
Material Document And Classification: qq-a-250/4,alloy 2024,t351 fed spec single material response overall
Media For Which Designed: air 1st response
Media For Which Designed: alcohol, ethyl 2nd response
Media For Which Designed: ammonia, gaseous 3rd response
Media For Which Designed: fuel/oil, hydrocarbon 4th response
Media For Which Designed: helium 5th response
Style Designator: straight thru w/baffle
Thread Series Designator: unjf 1st end
Furnished Items And Quantity: 1 deflector cap

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
10238-9PC7	Safety Relief Valve
6153-30-3	Safety Relief Valve
D559A-4D-3	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-019-4650?

The FSCG of the NSN 4820-01-019-4650 is 4820

Does the NSN 4820-01-019-4650 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-019-4650 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 4820-01-019-4650 contain precious materials?

Precious metal content is unknown

Does NSN 4820-01-019-4650 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 4820-01-019-4650 was assigned to the Federal Catalog?

It was assigned 50 years ago, on Thu, Apr 15, 1976