D559A-4D-1

View detailed technical data, stock status, and sourcing information for: D559A-4D-1
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-218-4611

Item Name Code

05488

Assigment Date

10/12/1985 (40 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.

spring disk loading method, poppet flow control device, 280.0 fahrenheit single response maximum operating temp, 3a all ends thread class, right-hand all ends thread direction

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 all ends
Thread Direction: right-hand all ends
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: 280.0 fahrenheit single response
Minimum Operating Temp: -40.0 fahrenheit
Connection Style: flared (tube) all ends
Valve Operation Method: automatic
Connection Type: threaded external tube all ends
Thread Quantity Per Inch: 20 all ends
Adjustable Pressure Range: +0.5 to 2.5 pounds per square inch
Maximum Operating Pressure: 200.0 pounds per square inch single response
Nominal Thread Size: 0.438 inches all ends
Seat Angle: 37.0 degrees all ends
Material: aluminum alloy 2024 body
Material: rubber synthetic packing
Material Document And Classification: mil-p-25732 mil spec single material response packing
Media For Which Designed: air 1st response
Media For Which Designed: fuel/oil, hydrocarbon 2nd response
Media For Which Designed: helium 3rd response
Media For Which Designed: hydrogen 4th response
Style Designator: straight thru w/baffle
Thread Series Designator: unjf all ends
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
D559A-4D-1	Safety Relief Valve
Z02RD04A010B	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-218-4611?

The FSCG of the NSN 4820-01-218-4611 is 4820

Does the NSN 4820-01-218-4611 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-218-4611 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 4820-01-218-4611 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-218-4611 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 4820-01-218-4611 was assigned to the Federal Catalog?

It was assigned 40 years ago, on Sat, Oct 12, 1985