The Valve,safety Relief, cataloged under National Stock Number 4820-01-494-9671, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-494-9671 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 93-2542-02591 | 5/9 Secondary reference Chart Inc Div Cryogenic Systems Div |
| 93-2542-02596 ITEM 1CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 93-2542-02591CP | 3/1 Design control — primary reference Naval Inventory Control Point Mechanicsburg |
| 93-2542-02596 | D/9 Drawing number reference only Chart Inc Div Cryogenic Systems Div |
| 93-2542-02596 ITEM 1 | 5/9 Secondary reference Chart Inc Div Cryogenic Systems Div |
NSN 4820-01-494-9671 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-494-9683. Verify interchangeability with system specifications before substitution.
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.