The Piston,valve, cataloged under National Stock Number 4820-00-375-7822, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-375-7822 |
| Primary Part Number | 564-3801-936858REV1PC23 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 0.375 INCHES MINIMUM AND 0.621 INCHES MAXIMUM IN |
| Material | STEEL |
| 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 |
|---|---|
| 564-3801-936858REV1PC23 PRIMARY | Naval Sea Systems Command (USA) |
| 22057 PRIMARY | Grove Valve Operations (USA) |
| 564-3801-936859REV1PC23 PRIMARY | Naval Sea Systems Command (USA) |
| N637PC23 PRIMARY | Grove Valve Operations (USA) |
| N638PC23 PRIMARY | Grove Valve Operations (USA) |
| Reference | Meaning |
|---|---|
| 564-3801-936858REV1PC23 | 5/9 Secondary reference U.S. Government activity |
| 564-3801-936859REV1PC23 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-375-7822 is a Piston,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-375-7822 has 5 manufacturer part numbers on file: 564-3801-936858REV1PC23 (Naval Sea Systems Command), 22057 (Grove Valve Operations), 564-3801-936859REV1PC23 (Naval Sea Systems Command), N637PC23 (Grove Valve Operations), N638PC23 (Grove Valve Operations).
2 possible matches (shared part number, not a government interchangeability claim): 6615-00-996-1344, 6525-01-592-9498. Verify interchangeability with system specifications before substitution.
Key specifications for 564-3801-936858REV1PC23: Outside Diameter: 0.375 INCHES MINIMUM AND 0.621 INCHES MAXIMUM IN; Overall Length: 1.780 INCHES NOMINAL IN; Material: STEEL. 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.