# NSN 4820-01-478-0990: Valve, Safety Relief

NSN 4820-01-478-0990 (also written 4820014780990; NIIN 01-478-0990) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 5 manufacturer part numbers from 5 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 4820-01-478-0990 (4820014780990)
- NIIN: 01-478-0990 (014780990)
- Item name: VALVE,SAFETY RELIEF
- Federal Supply Class: [FSC 4820 Valves, Nonpowered](https://nsnexplorer.com/fsc/4820/)
- Federal Supply Group: [FSG 48](https://nsnexplorer.com/group/48/)
- Acquisition method suffix code: AMSC C: needs engineering source approval; other sources must qualify first. (observed 2026-10-27)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAJF | THREAD DIRECTION | ALL ENDS RIGHT-HAND |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| ADSR | BONNET TYPE | INSIDE SPRING |
| ADST | BONNET ATTACHMENT METHOD | THREADED |
| ADSU | DISK LOADING METHOD | SPRING |
| AHNC | CONNECTION STYLE | — |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC |
| AWLS | CONNECTION TYPE | SECOND END THREADED INTERNAL PIPE |
| AWLS | CONNECTION TYPE | FIRST END THREADED EXTERNAL PIPE |
| CMLP | THREAD QUANTITY PER INCH | 18 |
| CQCY | ADJUSTABLE PRESSURE RANGE | POUNDS PER SQUARE INCH 3000.0 TO 4000.0 |
| CQJX | NOMINAL THREAD SIZE | FIRST END INCHES 0.250 |
| CQJX | NOMINAL THREAD SIZE | SECOND END INCHES 0.250 |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 3600.0 |
| MATT | MATERIAL | BODY STEEL COMP 316 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | BODY ASSN STD ALL MATERIAL RESPONSES AST-A266, CO- 316 |
| STYL | STYLE DESIGNATOR | — |
| THSD | THREAD SERIES DESIGNATOR | SECOND END NPT |
| THSD | THREAD SERIES DESIGNATOR | FIRST END NPT |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 2200004 | Z4W93 | ARA MARINE PTY LTD | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 4726-220-RVBA | Z3287 | HIFRASER PTY LTD | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 515-856 3600 PSI | 28953 | RIX INDUSTRIES | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| SS-4R3A5-F | 18034 | NUPRO CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| SS-4R3A5-F | 3T9T9 | SWAGELOK CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-01 | [SPE7MC26V4255](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820014780990) | VALVE, SAFETY RELIEF | III WILLIAMS LLC | $6,465.30 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820014780990&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820014780990
- AMSC record: https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/
- USAspending contract actions (each award above links to its record)
- All data is public U.S. government data; every row above links to its source record where one exists.

Canonical page: https://nsnexplorer.com/nsn/4820-01-478-0990/
JSON: https://nsnexplorer.com/api/nsn/4820-01-478-0990.json