The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-343-0439, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-343-0439 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | PLUG |
| Criticality Code Justification | ZZZY |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY SEAT |
| Media for Which Designed | WATER, SALT |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 845-6556172-1 | 5/1 Secondary reference Naval Sea Systems Command |
| 845-6556172 ITEM 1L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 845-6556172-1L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 845-6556172 ITEM 1 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-343-0439 is a Valve,relief,pressure and Temper, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-343-0439: Flow Control Device: PLUG; Criticality Code Justification: ZZZY; Material: COPPER ALLOY FLOW CONTROL DEVICE; Material: COPPER ALLOY SEAT. 6 specifications are 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.
NSN 4820-01-343-0439 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.