The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-199-8734, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydrasearch Company, Llc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-199-8734 |
| Primary Part Number | 6VR49-3 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydrasearch Company, Llc |
| Status | ACTIVE |
| Material | COPPER ALLOY BODY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6VR49-3 PRIMARY | Hydrasearch Company, Llc (USA) |
| M3687-2383 | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| Reference | Meaning |
|---|---|
| 4820PL0674998 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| M3687-2383 | 5/9 Secondary reference Derbyshire Machine & Tool Co |
NSN 4820-01-199-8734 is a Valve,relief,pressure and Temper, manufactured by Hydrasearch Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-199-8734 has 2 manufacturer part numbers on file: 6VR49-3 (Hydrasearch Company, Llc), M3687-2383 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-559-0402, 4820-01-559-0421, 4820-01-559-0432. Verify interchangeability with system specifications before substitution.
Key specifications for 6VR49-3: Material: COPPER ALLOY BODY. 1 specification is documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.