The Disk,valve, cataloged under National Stock Number 4820-01-418-4091, 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 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-418-4091 |
| Primary Part Number | 218013532 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Shank Diameter | 0.374 INCHES NOMINAL IN |
| Flange Seat to Disk End Height | 3.260 INCHES NOMINAL IN |
| Outside Diameter | 2.375 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Material Document and Classification | QQ-S-763, CLASS 304, COND A FED SPEC SINGLE MATERIAL RESPONSE |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Material | STEEL COMP 304 |
| 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 |
|---|---|
| 556-6406597-MRFH-B23 | Naval Sea Systems Command (USA) |
| 556-6406597-MRFH-A23 | Naval Sea Systems Command (USA) |
| 218013532 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| C791-5701 FIND MRFH-A23 | 5/9 Secondary reference U.S. Government activity |
| DF2300-4660 FIND MRFH-A23 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-418-4091 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-418-4091 has 3 manufacturer part numbers on file: 556-6406597-MRFH-B23 (Naval Sea Systems Command), 556-6406597-MRFH-A23 (Naval Sea Systems Command), 218013532 (Naval Sea Systems Command).
Key specifications for 218013532: Shank Diameter: 0.374 INCHES NOMINAL IN; Flange Seat to Disk End Height: 3.260 INCHES NOMINAL IN; Overall Height: 3.450 INCHES NOMINAL IN; Outside Diameter: 2.375 INCHES NOMINAL IN. 7 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.