The Valve,vent, cataloged under National Stock Number 4820-01-436-3857, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-436-3857 |
| Item Name | Valve,vent |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| 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 |
| Reference | Meaning |
|---|---|
| KT-4564-1-33 | 5/9 Secondary reference Entwistle Co the Kenett Hydraulic Systems Div |
| KT-4564-20 | 3/9 Design control — primary reference Entwistle Co the Kenett Hydraulic Systems Div |
| KT-4564-1 | D/9 Drawing number reference only Entwistle Co the Kenett Hydraulic Systems Div |
NSN 4820-01-436-3857 is a Valve,vent, classified under FSC 4820, Valves, Nonpowered. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-436-3888, 4820-01-436-3934, 6680-01-437-3404. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-436-3857: Special Features: 15 PSI NORMAL OPERATING PRESSURE; End Item Identification: SEAWOLF CLASS SSN; 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.