D559A-4D-42
View detailed technical data, stock status, and sourcing information for: D559A-4D-42
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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.
3a 1st end thread class, right-hand 1st end thread direction, spring disk loading method, 280.0 fahrenheit single response maximum operating temp, poppet flow control device
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
- 0.437 inches 1st end
- Opening Pressure Setting
- 42.0 pounds per square inch
- Material
- aluminum alloy 2024 and rubber butadiene-acrylonitrile class nbr flow control device
- Material
- aluminum alloy 2024 body
- Material
- aluminum alloy 2024 seat
- Material Document And Classification
- qq-a-225/6,alloy2024,t4 fed spec single material response body
- Material Document And Classification
- qq-a-225/6,alloy2024,t4 fed spec single material response flow control device
- Material Document And Classification
- qq-a-225/6,alloy2024,t4 fed spec single material response seat
- Media For Which Designed
- acetylene 2nd response
- Media For Which Designed
- air 1st response
- Media For Which Designed
- ammonia, gaseous 3rd response
- Media For Which Designed
- hydrogen 5th response
- Media For Which Designed
- refrigerant 12 4th 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 |
|---|---|
| 247ASC1527-002 | Safety Relief Valve |
| D559A-4D-42 | Safety Relief Valve |
| D559A4D42PS1 | Safety Relief Valve |
| D559A4D42PSI | Safety Relief Valve |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 4820-00-009-5209?
Does the NSN 4820-00-009-5209 have a Schedule B code assigned?
Does NSN 4820-00-009-5209 require demilitarization?
Does NSN 4820-00-009-5209 contain precious materials?
Does NSN 4820-00-009-5209 contain hazardous materials?
When the NSN 4820-00-009-5209 was assigned to the Federal Catalog?
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