The Piston,valve, cataloged under National Stock Number 4820-01-303-2528, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Portland Valve Llc. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-303-2528 |
| Primary Part Number | 6385850CB |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Portland Valve Llc |
| Status | ACTIVE |
| Valve Size for Which Designed | 6.000 INCHES IN |
| Material | IRON CAST |
| 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 |
|---|---|
| 6385850CB PRIMARY | Portland Valve Llc (USA) |
| Reference | Meaning |
|---|---|
| V999QZR1000 | D/9 Drawing number reference only Hammel Dahl Inc |
| 82433AA | 5/9 Secondary reference Hammel Dahl Inc |
| V999QZR1000 PIECE 16 | 5/9 Secondary reference Hammel Dahl Inc |
NSN 4820-01-303-2528 is a Piston,valve, manufactured by Portland Valve Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-303-2528 has 1 manufacturer part number on file: 6385850CB (Portland Valve Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-303-2573, 4820-01-303-2591. Verify interchangeability with system specifications before substitution.
Key specifications for 6385850CB: Valve Size for Which Designed: 6.000 INCHES IN; Special Features: FOR BALLAST VALVE; Material: IRON CAST. 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.