# NSN 4820-00-451-0570: Valve, Safety Relief

NSN 4820-00-451-0570 (also written 4820004510570; NIIN 00-451-0570) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 2 manufacturer part numbers from 2 suppliers are on record. It was last purchased in Aug 2026.

## Identification

- NSN: 4820-00-451-0570 (4820004510570)
- NIIN: 00-451-0570 (004510570)
- 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 D: the data needed to compete the part is unavailable or cannot be obtained economically. (observed 2026-11-04)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC |
| AHNC | CONNECTION STYLE | — |
| ADSY | VALVE DISCHARGE FLOW RATE | GALLONS PER MINUTE 6.0 |
| AAJF | THREAD DIRECTION | FIRST END RIGHT-HAND |
| CQJX | NOMINAL THREAD SIZE | FIRST END INCHES 0.750 |
| AEHZ | MAXIMUM OPERATING TEMP | SINGLE RESPONSE FAHRENHEIT 275.0 |
| CQQF | OPERATING PRESSURE | SINGLE RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 35.0 |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 48.0 |
| CWFD | NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED | FIRST END INCHES 0.500 |
| CWFD | NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED | SECOND END INCHES 0.500 |
| FEAT | SPECIAL FEATURES | SECOND END DESCRIPTION IS INLET |
| MATT | MATERIAL | BODY STEEL COMP 303 |
| MATT | MATERIAL | FLOW CONTROL DEVICE STEEL COMP 630 |
| MATT | MATERIAL | SEAT STEEL COMP 303 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | BODY FED SPEC 1ST MATERIAL RESPONSE QQ-S-764,TYE 303-CANCELED |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | FLOW CONTROL DEVICE MFR REF 2ND MATERIAL RESPONSE A-S 5643 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | SEAT FED SPEC 3RD MATERIAL RESPONSE QQ-S-764,TYE 303-CANCELED |
| MEDA | MEDIA FOR WHICH DESIGNED | SINGLE RESPONSE HYDRAULIC FLUID, MINERAL BASE |
| THSD | THREAD SERIES DESIGNATOR | FIRST END UNIFIED NATIONAL JOINT FINE (UNJF) |
| THSD | THREAD SERIES DESIGNATOR | SECOND END UNF |
| AWLS | CONNECTION TYPE | SECOND END THREADED EXTERNAL BOSS |
| CBBL | FEATURES PROVIDED | PRESSURE TIGHT OUTLET SIDE |
| ADSR | BONNET TYPE | PACKING RETAINING |
| ADSU | DISK LOADING METHOD | SPRING |
| CMLP | THREAD QUANTITY PER INCH | 16 |
| AWLS | CONNECTION TYPE | FIRST END THREADED INTERNAL BOSS |
| AAJD | THREAD CLASS | 3A |
| AAJD | THREAD CLASS | 3B |
| CQJX | NOMINAL THREAD SIZE | SECOND END INCHES 0.750 |
| AAJF | THREAD DIRECTION | SECOND END RIGHT-HAND |
| ADQU | FLOW CONTROL DEVICE | POPPET |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 65651-09106-102 | 78286 | SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| H555 | 06239 | AUSCO INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-08-12 | [SPE7MC26V3905](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820004510570) | VALVE, SAFETY RELIEF | AUSCO INC | $50,184.80 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820004510570&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820004510570
- 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/4820-00-451-0570/
JSON: https://nsnexplorer.com/api/nsn/4820-00-451-0570.json