The Cap,valve, cataloged under National Stock Number 4820-01-540-3072, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-540-3072 |
| Item Name | Cap,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Valve Model Number for Which Designed | C3XX |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Attachment Method | BOLTS |
| 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 |
|---|---|
| 2177525 | D/9 Drawing number reference only U.S. Government activity |
| 803-2177525-C3XX-87 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-540-3072 is a Cap,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-573-3612, 4820-01-575-9387. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-540-3072: Valve Model Number for Which Designed: C3XX; Valve Size for Which Designed: 0.500 INCHES IN; Special Features: BONNET ASSEMBLY CONSISTS OF YOKE BUSHING; GLAND EYE BOLTS; GROOVE PINS; IDENT PLATE; DRIVE SCREWS AND BONNET.; End Item Identification: NUCLEAR REACTOR BOUNDRY AREA.. 3 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.