# NSN 4820-01-020-4709: Valve, Safety Relief

NSN 4820-01-020-4709 (also written 4820010204709; NIIN 01-020-4709) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 7 manufacturer part numbers from 3 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 4820-01-020-4709 (4820010204709)
- NIIN: 01-020-4709 (010204709)
- 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 R: the government owns neither the data nor the rights, and obtaining them is judged uneconomical. (observed 2026-10-10)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | SECOND END INCHES 0.750 |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | FIRST END INCHES 0.750 |
| AAJF | THREAD DIRECTION | FIRST END RIGHT-HAND |
| AAJF | THREAD DIRECTION | SECOND END RIGHT-HAND |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| ADSR | BONNET TYPE | INSIDE SPRING |
| ADST | BONNET ATTACHMENT METHOD | INTEGRAL |
| ADSU | DISK LOADING METHOD | SPRING |
| AHNC | CONNECTION STYLE | — |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC OR MANUAL |
| AWLS | CONNECTION TYPE | SECOND END THREADED EXTERNAL PIPE |
| AWLS | CONNECTION TYPE | FIRST END THREADED INTERNAL PIPE |
| CQJX | NOMINAL THREAD SIZE | FIRST END INCHES 0.750 |
| CQJX | NOMINAL THREAD SIZE | SECOND END INCHES 0.750 |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 55.0 |
| MATT | MATERIAL | FLOW CONTROL DEVICE COPPER ALLOY OR PLASTIC POLYTETRAFLUOROETHYLENE |
| MATT | MATERIAL | SEAT COPPER ALLOY |
| MATT | MATERIAL | BODY COPPER ALLOY |
| MATT | MATERIAL | STEM COPPER ALLOY |
| SFTT | SURFACE TREATMENT | LOCATION NOT OTHERWISE SPECIFIED CHROMIUM |
| STYL | STYLE DESIGNATOR | — |
| THSD | THREAD SERIES DESIGNATOR | SECOND END NPT |
| THSD | THREAD SERIES DESIGNATOR | FIRST END NPT |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 10-301-50 | 72219 | AALBERTS INTEGRATED PIPING SYSTEMS AMERICAS, INC. | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 10-301CHROME55PSI | 72219 | AALBERTS INTEGRATED PIPING SYSTEMS AMERICAS, INC. | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 10-322-P55 | 72219 | AALBERTS INTEGRATED PIPING SYSTEMS AMERICAS, INC. | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 125-3/4-55-STEAM | 93641 | AQUATROL INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 440173 | 35550 | GREENFIELD WORLD TRADE INC DIV GREENFIELD WORLD TRADE INC D/B/A LEGION INDUSTRIES | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| AQV125BA1MIL1 | 93641 | AQUATROL INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| SERIES125 | 93641 | AQUATROL INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Price history

Newest first.

| Date | Unit price | Quantity | Supplier | Agency | Source |
| --- | --- | --- | --- | --- | --- |
| 2026-09-23 | $78.20 | 172 | ECHELON SUPPLY AND SERVICE, INC. | — | [record](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820010204709) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-23 | [SPE7MC26V4444](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820010204709) | VALVE, SAFETY RELIEF | ECHELON SUPPLY AND SERVICE, INC. | $13,450.40 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820010204709&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820010204709
- 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/4820-01-020-4709/
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