The Seat,valve, cataloged under National Stock Number 4820-00-468-0837, 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 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-468-0837 |
| Primary Part Number | 490731PC34 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.418 INCHES NOMINAL IN |
| Flange Diameter | 4.812 INCHES NOMINAL IN |
| Body Outside Diameter | 4.489 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 3.780 INCHES NOMINAL IN |
| Seat Radius | 2.073 INCHES NOMINAL IN |
| Under Flange Height | 0.830 INCHES NOMINAL IN |
| Material | COPPER ALLOY OVERALL |
| Seating Surface Shape | RADIAL |
| 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 |
|---|---|
| 490731PC34 PRIMARY | Naval Sea Systems Command (USA) |
| 490722PC34 PRIMARY | Naval Sea Systems Command (USA) |
| 2R293PC34 PRIMARY | Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots (USA) |
| 2R302PC34 PRIMARY | Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots (USA) |
| Reference | Meaning |
|---|---|
| 1612-285PC34 | 3/2 Design control — primary reference U.S. Government activity |
| 1603-285PC34 | 3/2 Design control — primary reference U.S. Government activity |
| 490722PC34 | 5/9 Secondary reference U.S. Government activity |
| 490731PC34 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-468-0837 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-468-0837 has 4 manufacturer part numbers on file: 490731PC34 (Naval Sea Systems Command), 490722PC34 (Naval Sea Systems Command), 2R293PC34 (Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots), 2R302PC34 (Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots).
Key specifications for 490731PC34: Flange Seat to Disk End Height: 0.418 INCHES NOMINAL IN; Flange Diameter: 4.812 INCHES NOMINAL IN; Body Outside Diameter: 4.489 INCHES NOMINAL IN; Style Designator: PLAIN FLANGED. 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.