The Piston,valve, cataloged under National Stock Number 4820-01-207-0565, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-207-0565 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material Document and Classification | MIL-16576A MIL SPEC SINGLE MATERIAL RESPONSE A |
| Valve Size for Which Designed | 12.000 INCHES IN |
| Valve Design Control Activity | 96169 |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| SSN637-515-2143625 | D/9 Drawing number reference only U.S. Government activity |
| 77553-78X14 | D/9 Drawing number reference only U.S. Government activity |
| SSN637-515-2143625 PIECE 3 | 5/2 Secondary reference U.S. Government activity |
| 77553-78X14 PIECE 3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-207-0565 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 3010-01-292-5712. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-207-0565: Material Document and Classification: MIL-16576A MIL SPEC SINGLE MATERIAL RESPONSE A; Valve Size for Which Designed: 12.000 INCHES IN; Valve Design Control Activity: 96169; End Item Identification: SS(N)637 CLASS COMBINATION 12 IN. INBOARD OUTBOARD MAIN SEA WATER VALVE IN. 4 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.