The Stem,fluid Valve, cataloged under National Stock Number 4820-00-596-3599, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-00-596-3599 |
| Primary Part Number | 8551-003-063 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Largest Outside Diameter | 0.750 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 8551-003-063 PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 8551-3-63 | 5/9 Secondary reference Velan Valve Corp. |
| 8551-3-64 | 5/9 Secondary reference Velan Valve Corp. |
| 8551-003-064 | 5/9 Secondary reference Velan Valve Corp. |
NSN 4820-00-596-3599 is a Stem,fluid Valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-596-3599 has 1 manufacturer part number on file: 8551-003-063 (Velan Valve Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-183-4733. Verify interchangeability with system specifications before substitution.
Key specifications for 8551-003-063: Largest Outside Diameter: 0.750 INCHES NOMINAL IN; Overall Length: 11.250 INCHES NOMINAL IN; Material: STEEL CORROSION RESISTING. 2 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.
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.