The Seat,valve, cataloged under National Stock Number 4820-00-337-1046, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-337-1046 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.623 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Flange Diameter | 4.250 INCHES MINIMUM AND 4.251 INCHES MAXIMUM IN |
| Body Outside Diameter | 3.625 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 1.706 INCHES MINIMUM AND 1.708 INCHES MAXIMUM IN |
| Seat Radius | 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN |
| Under Flange Height | 2.313 INCHES NOMINAL IN |
| Material | COBALT ALLOY SEAT |
| 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 |
| Reference | Meaning |
|---|---|
| 137B367-1 | 5/9 Secondary reference General Electric Company |
| 137B367-1 | 3/9 Design control — primary reference Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| J3169677PC45 | 5/9 Secondary reference U.S. Government activity |
| B3169686PC1 | 5/9 Secondary reference U.S. Government activity |
| 137B367-1 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| 137B367-1 | 5/9 Secondary reference General Electric Company |
| 7089B19PC45 | 5/9 Secondary reference General Electric Co Switchgear and Control Division of Apparatus Group |
| 7089B19PC45 | 5/9 Secondary reference General Electric Company |
NSN 4820-00-337-1046 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-337-1046: Flange Seat to Disk End Height: 0.623 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN; Flange Diameter: 4.250 INCHES MINIMUM AND 4.251 INCHES MAXIMUM IN; Body Outside Diameter: 3.625 INCHES NOMINAL IN; Style Designator: PLAIN FLANGED. 10 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.