# NSN 4820-01-531-6737: Valve, Safety Relief

NSN 4820-01-531-6737 (also written 4820015316737; NIIN 01-531-6737) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 2 manufacturer part numbers from 1 supplier are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 4820-01-531-6737 (4820015316737)
- NIIN: 01-531-6737 (015316737)
- 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: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | FIRST END INCHES 0.250 |
| AAAR | NOMINAL PIPE SIZE ACCOMMODATED | SECOND END INCHES 0.500 |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| AHNC | CONNECTION STYLE | — |
| AQLR | VALVE OPERATION METHOD | MANUAL |
| AWLS | CONNECTION TYPE | FIRST END BUTT WELD PIPE |
| AWLS | CONNECTION TYPE | SECOND END BUTT WELD PIPE |
| CXCY | PART NAME ASSIGNED BY CONTROLLING AGENCY | RELIEF VALVE ASSEMBLY 1/4" X 1/2" |
| MATT | MATERIAL | BODY STEEL COMP 316 |
| MATT | MATERIAL | SEAT PLASTIC POLYAMIDE NYLON |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | SEAT MIL SPEC SINGLE MATERIAL RESPONSE -IL-R-46198 (SUERSEDED) |
| PRPY | PROPRIETARY CHARACTERISTICS | PACS |
| STYL | STYLE DESIGNATOR | — |
| TMQY | FURNISHED ITEMS AND QUANTITY | HANDLE 1 AND SPRING 1 AND TAILPIECE 2 |
| ZZZT | NONDEFINITIVE SPEC/STD DATA | MATERIAL VESEL S-1 SEAT |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 284361-0009 | 99657 | MAROTTA CONTROLS INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| PRV95FA/284361-0009 | 99657 | MAROTTA CONTROLS INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Price history

Newest first.

| Date | Unit price | Quantity | Supplier | Agency | Source |
| --- | --- | --- | --- | --- | --- |
| 2026-09-22 | $68,751.00 | 2 | MAROTTA CONTROLS INC | — | [record](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820015316737) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-22 | [SPE7MC26V4554](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820015316737) | VALVE, SAFETY RELIEF | MAROTTA CONTROLS INC | $137,502.00 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820015316737&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820015316737
- 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/4820-01-531-6737/
JSON: https://nsnexplorer.com/api/nsn/4820-01-531-6737.json