The Seat,valve, cataloged under National Stock Number 4820-01-199-8743, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-199-8743 |
| Primary Part Number | 23399REVM PIECE 5 2IN |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.763 INCHES MINIMUM AND 0.764 INCHES MAXIMUM IN |
| Flange Diameter | 1.828 INCHES NOMINAL IN |
| Body Outside Diameter | 1.622 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 1.495 INCHES MINIMUM AND 1.505 INCHES MAXIMUM IN |
| Under Flange Height | 0.374 INCHES MINIMUM AND 0.383 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Seat Angle in Deg | 7.000 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 |
| Part Number | Manufacturer |
|---|---|
| 23399REVM PIECE 5 2IN PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 23399 | D/9 Drawing number reference only Velan Valve Corp. |
| 2557-73-69 | C/1 Advisory reference — outside the item-of-supply concept Velan Valve Corp. |
| 2557-073-046-S | C/1 Advisory reference — outside the item-of-supply concept Velan Valve Corp. |
NSN 4820-01-199-8743 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-199-8743 has 1 manufacturer part number on file: 23399REVM PIECE 5 2IN (Velan Valve Corp.).
Key specifications for 23399REVM PIECE 5 2IN: Flange Seat to Disk End Height: 0.763 INCHES MINIMUM AND 0.764 INCHES MAXIMUM IN; Flange Diameter: 1.828 INCHES NOMINAL IN; Body Outside Diameter: 1.622 INCHES MINIMUM AND 1.625 INCHES MAXIMUM 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.