The Valve,safety Relief, cataloged under National Stock Number 4820-01-193-4646, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-193-4646 |
| 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 |
|---|---|
| D48669 R10B 133T163PSI | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D48669 R10B 133T163PSI | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| R10BF1F120 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
| R10BF1F116-BM1 AND D4866 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| R10BF1F116-BM1 AND D4866 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D48669 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
| R10BF1F116-BM1 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-193-4646 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-228-5535. 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.