The Disk,valve, cataloged under National Stock Number 4820-01-511-3905, 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 9 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-511-3905 |
| Primary Part Number | 2177917-10-25 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Pressure Rating | 250.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Supplementary Features | SUPPLIED WITH EXCESS MATERIAL ON THE SEATING SURFACE THAT MUST BE MACHINED OFF WHEN FITTING NEW SEAT AND WEDGE. REPLACES 4820-01-455-5005 DUE TO DESIGN CHANGE FOR A ONE-PIECE CAST WEDGE THAT REPLACES A TWO-PIECE, BRAZED WEDGE. |
| Taper Minor Diameter | 1.774 INCHES NOMINAL IN |
| Style Designator | SOLID WEDGE |
| Taper Major Diameter | 3.758 INCHES NOMINAL IN |
| Seat Angle | 5.0 DEGREES NOMINAL |
| Taper Length | 11.188 INCHES NOMINAL IN |
| Media for Which Designed | GAS OR OIL OR WATER |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 2177917-10-25 PRIMARY | Naval Sea Systems Command (USA) |
| 253871 PC 5 & PC 6 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 4354-W05F-183 | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 2177917 | D/9 Drawing number reference only Naval Sea Systems Command |
| 253871 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 253871 PC 5 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-511-3905 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-511-3905 has 3 manufacturer part numbers on file: 2177917-10-25 (Naval Sea Systems Command), 253871 PC 5 & PC 6 (Huntington Ingalls Inc Div Newport News Shipbuilding), 4354-W05F-183 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).
Key specifications for 2177917-10-25: Pressure Rating: 250.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Supplementary Features: SUPPLIED WITH EXCESS MATERIAL ON THE SEATING SURFACE THAT MUST BE MACHINED OFF WHEN FITTING NEW SEAT AND WEDGE. REPLACES 4820-01-455-5005 DUE TO DESIGN CHANGE FOR A ONE-PIECE CAST WEDGE THAT REPLACES A TWO-PIECE, BRAZED WEDGE.; Taper Minor Diameter: 1.774 INCHES NOMINAL IN; Style Designator: SOLID WEDGE. 9 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.