The Seat,valve, cataloged under National Stock Number 4820-00-337-1083, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 19 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-337-1083 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.188 INCHES NOMINAL IN |
| Flange Diameter | 2.000 INCHES NOMINAL IN |
| Body Outside Diameter | 1.751 INCHES MINIMUM AND 1.752 INCHES MAXIMUM IN |
| Hardness Rating | 210.0 BRINELL STANDARD NOMINAL BODY |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 1.250 INCHES NOMINAL IN |
| Under Flange Height | 0.688 INCHES NOMINAL IN |
| Seat Angle in Deg | 45.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| DD423S53-082PC39 | 5/2 Secondary reference U.S. Government activity |
| DD423S53-080PC39 | 5/2 Secondary reference U.S. Government activity |
| D15-518MPC393 | 5/2 Secondary reference U.S. Government activity |
| 9988 | 3/2 Design control — primary reference U.S. Government activity |
| D15-518WPC393 | 5/2 Secondary reference U.S. Government activity |
| D15-518MPC393 | 5/9 Secondary reference U.S. Government activity |
| D15-518MPC393 | 5/9 Secondary reference Westinghouse Electric Corp |
| D15-518VPC393 | 5/9 Secondary reference U.S. Government activity |
| D15-518UPC393 | 5/9 Secondary reference U.S. Government activity |
| D15-518WPC393 | 5/9 Secondary reference Westinghouse Electric Corp |
| DD423S53-072PC39 | 5/2 Secondary reference U.S. Government activity |
| DD423S53-081PC39 | 5/2 Secondary reference U.S. Government activity |
| D15-518VPC393 | 5/2 Secondary reference U.S. Government activity |
| D15-518VPC393 | 5/9 Secondary reference Westinghouse Electric Corp |
| 9988 | 5/9 Secondary reference U.S. Government activity |
| D15-518UPC393 | 5/2 Secondary reference U.S. Government activity |
| D15-518WPC393 | 5/9 Secondary reference U.S. Government activity |
| 9988 | 5/9 Secondary reference Westinghouse Electric Corp |
| D15-518UPC393 | 5/9 Secondary reference Westinghouse Electric Corp |
NSN 4820-00-337-1083 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5955-00-499-7333, 6515-01-567-5591, 6650-01-570-8971. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-337-1083: Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN; Flange Diameter: 2.000 INCHES NOMINAL IN; Body Outside Diameter: 1.751 INCHES MINIMUM AND 1.752 INCHES MAXIMUM IN; Hardness Rating: 210.0 BRINELL STANDARD NOMINAL BODY. 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.