# NSN 4820-00-549-4733: Valve, Safety Relief

NSN 4820-00-549-4733 (also written 4820005494733; NIIN 00-549-4733) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 9 manufacturer part numbers from 8 suppliers are on record. The government has 1 open solicitation for it.

## Identification

- NSN: 4820-00-549-4733 (4820005494733)
- NIIN: 00-549-4733 (005494733)
- 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 2026-11-04)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| CBBL | FEATURES PROVIDED | PRESSURE TIGHT OUTLET SIDE |
| CQJX | NOMINAL THREAD SIZE | FIRST END INCHES 0.250 |
| AEHZ | MAXIMUM OPERATING TEMP | SECOND RESPONSE FAHRENHEIT 250.0 |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC |
| MATT | MATERIAL | OVERALL COPPER ALLOY |
| MEDA | MEDIA FOR WHICH DESIGNED | FIFTH RESPONSE HYDROGEN |
| MEDA | MEDIA FOR WHICH DESIGNED | FIRST RESPONSE AIR |
| AEHZ | MAXIMUM OPERATING TEMP | FIRST RESPONSE FAHRENHEIT -40.0 |
| MEDA | MEDIA FOR WHICH DESIGNED | SECOND RESPONSE ACETYLENE |
| MEDA | MEDIA FOR WHICH DESIGNED | THIRD RESPONSE AMMONIA, GASEOUS |
| STYL | STYLE DESIGNATOR | — |
| AWLS | CONNECTION TYPE | FIRST END THREADED EXTERNAL PIPE |
| THSD | THREAD SERIES DESIGNATOR | FIRST END NPT |
| MEDA | MEDIA FOR WHICH DESIGNED | FOURTH RESPONSE REFRIGERANT 12 |
| AHNC | CONNECTION STYLE | — |
| AAJF | THREAD DIRECTION | FIRST END RIGHT-HAND |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| ADSU | DISK LOADING METHOD | SPRING |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | FIRST END INCHES 0.250 |
| CQQF | OPERATING PRESSURE | FIRST RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 200.0 |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 10.0 |
| FEAT | SPECIAL FEATURES | POP-OFF TYPE |
| CMLP | THREAD QUANTITY PER INCH | 18 |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 559B-2M-10 | 91816 | CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 559B2M | 12566 | WOMACK MACHINE SUPPLY COMPANY OF OKLAHOMA, INC. | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 559B2M10PSI | 91816 | CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 672238 | 1PQF4 | CAE USA INC. | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 672238 | 36378 | RAYTHEON TECHNICAL SERVICES COMPANY | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 6900-0014-001 | 06032 | ANTENNA PRODUCTS CORPORATION DBA ANTENNA PRODUCTS CORP | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 7748765 | 19204 | ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 7748765 | 19207 | U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| SCD10302-2 | 04984 | CELTECH CORPORATION DIV USE CAGE 65552 FOR ALL ORDERS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Open solicitations

| Solicitation | Quantity | Closes | Link |
| --- | --- | --- | --- |
| SPE7MC-27-T-1633 | 135 | 2026-11-16 | [DIBBS](https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820005494733&category=nsn) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-08-12 | [SPE7M226V4766](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005494733) | VALVE, SAFETY RELIEF | JGILS, LLC DBA JGILS LLC | $12,239.64 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820005494733&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005494733
- 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.

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