The Piston,valve, cataloged under National Stock Number 4820-01-209-0894, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-209-0894 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Outside Diameter | 16.998 INCHES NOMINAL IN |
| Material Document and Classification | MIL-M-16576 MIL SPEC SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 12.000 INCHES IN |
| Inside Diameter | 12.001 INCHES NOMINAL 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 |
|---|---|
| 76553-78X24 PIECE 3 | 3/2 Design control — primary reference U.S. Government activity |
| 209-2147527 | D/9 Drawing number reference only U.S. Government activity |
| 209-2147527 PIECE 3 | 5/2 Secondary reference U.S. Government activity |
| 76553-78X24 | D/9 Drawing number reference only U.S. Government activity |
| SSBN654-209-2147527 PIECE 3 | 5/9 Secondary reference U.S. Government activity |
| SSBN654-209-2147527 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-209-0894 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 3010-01-210-1385, 3010-01-210-1386. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-209-0894: Outside Diameter: 16.998 INCHES NOMINAL IN; Material Document and Classification: MIL-M-16576 MIL SPEC SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 12.000 INCHES IN; Inside Diameter: 12.001 INCHES NOMINAL IN. 6 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.