# NSN 4820-00-591-5331: Valve, Safety Relief

NSN 4820-00-591-5331 (also written 4820005915331; NIIN 00-591-5331) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 2 manufacturer part numbers from 2 suppliers are on record. No purchases are on record yet.

## Identification

- NSN: 4820-00-591-5331 (4820005915331)
- NIIN: 00-591-5331 (005915331)
- 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 G: the government has a complete data package and the rights to use it. (observed 2026-10-10)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 120.0 |
| FEAT | SPECIAL FEATURES | WITH SCREEN,COPPER 22 BY 22 MESH,0.015 IN. DIA WIRE,SOLDERED ON MALE END |
| MATT | MATERIAL | BODY COPPER ALLOY |
| MATT | MATERIAL | FLOW CONTROL DEVICE COPPER ALLOY |
| ADSY | VALVE DISCHARGE FLOW RATE | GALLONS PER MINUTE 10.0 |
| AHNC | CONNECTION STYLE | — |
| MATT | MATERIAL | SEAT COPPER ALLOY |
| STYL | STYLE DESIGNATOR | — |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | SECOND END INCHES 0.500 |
| SUPP | SUPPLEMENTARY FEATURES | SOLDER WITH ITEM USING MINIMUM AMOUNT OF HEAT POSSIBLE; WRAP BODY OF VALVE WITH WET CLOTH BEFORE APPLYING HEAT |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | FIRST END INCHES 0.500 |
| CXCY | PART NAME ASSIGNED BY CONTROLLING AGENCY | VALVE, PRESSURE RELIEF MODIFIED |
| AWLS | CONNECTION TYPE | SECOND END THREADED EXTERNAL PIPE |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| AWLS | CONNECTION TYPE | FIRST END THREADED INTERNAL PIPE |
| AAJF | THREAD DIRECTION | FIRST END RIGHT-HAND |
| AAJF | THREAD DIRECTION | SECOND END RIGHT-HAND |
| ADSU | DISK LOADING METHOD | SPRING |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 12C506M1 | 98437 | ELLIS & WATTS INTERNATIONAL, LLC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| RV51-164 | 91816 | CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820005915331&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005915331
- AMSC record: https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/
- 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/4820-00-591-5331/
JSON: https://nsnexplorer.com/api/nsn/4820-00-591-5331.json