# NSN 4820-00-455-1097: Valve, Safety Relief

NSN 4820-00-455-1097 (also written 4820004551097; NIIN 00-455-1097) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 3 manufacturer part numbers from 2 suppliers are on record. No purchases are on record yet.

## Identification

- NSN: 4820-00-455-1097 (4820004551097)
- NIIN: 00-455-1097 (004551097)
- 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 2026-10-10)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AWLS | CONNECTION TYPE | ALL ENDS THREADED EXTERNAL TUBE |
| AHNC | CONNECTION STYLE | — |
| CQQF | OPERATING PRESSURE | SINGLE RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 200.0 |
| FEAT | SPECIAL FEATURES | VALVE SIZE 1.000 IN. |
| MATT | MATERIAL | BODY STEEL COMP 303 |
| MATT | MATERIAL | FLOW CONTROL DEVICE RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR AND STEEL COMP 303 |
| MATT | MATERIAL | SEAT STEEL |
| MATT | MATERIAL | STEM STEEL COMP 303 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | BODY FED SPEC SINGLE MATERIAL RESPONSE FED STD 66 |
| AAJF | THREAD DIRECTION | ALL ENDS RIGHT-HAND |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 10.0 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | STEM FED SPEC 1ST MATERIAL RESPONSE FED STD 66 |
| CQRB | SEAT ANGLE | ALL ENDS DEGREES 37.0 |
| MEDA | MEDIA FOR WHICH DESIGNED | FOURTH RESPONSE FUEL/OIL, HYDROCARBON |
| MEDA | MEDIA FOR WHICH DESIGNED | SECOND RESPONSE ALCOHOL, ETHYL |
| MEDA | MEDIA FOR WHICH DESIGNED | THIRD RESPONSE AMMONIA, GASEOUS |
| STYL | STYLE DESIGNATOR | — |
| THSD | THREAD SERIES DESIGNATOR | ALL ENDS UNIFIED NATIONAL JOINT (UNJ) |
| TMQY | FURNISHED ITEMS AND QUANTITY | DEFLECTOR CAP 1 |
| MEDA | MEDIA FOR WHICH DESIGNED | FIRST RESPONSE AIR |
| AAJD | THREAD CLASS | 3A |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | FLOW CONTROL DEVICE FED SPEC SINGLE MATERIAL RESPONSE FED STD 66 |
| CMLP | THREAD QUANTITY PER INCH | 12 |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| ADSU | DISK LOADING METHOD | SPRING |
| AEHZ | MAXIMUM OPERATING TEMP | FIRST RESPONSE FAHRENHEIT -40.0 |
| AEHZ | MAXIMUM OPERATING TEMP | SECOND RESPONSE FAHRENHEIT 280.0 |
| CQJX | NOMINAL THREAD SIZE | ALL ENDS INCHES 1.312 |
| MEDA | MEDIA FOR WHICH DESIGNED | FIFTH RESPONSE HELIUM |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 513-50053 | 9F512 | PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV HYDRAULIC PUMP DIVISION | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| D559T-16D-10 | 91816 | CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| D559T-16D-10-30 | 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=4820004551097&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820004551097
- 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/4820-00-455-1097/
JSON: https://nsnexplorer.com/api/nsn/4820-00-455-1097.json