The Seat,valve, cataloged under National Stock Number 4820-01-131-3145, 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 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-131-3145 |
| Primary Part Number | 23399 ITEM 5 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.341 INCHES MINIMUM AND 0.342 INCHES MAXIMUM IN |
| Flange Diameter | 0.719 INCHES NOMINAL IN |
| Body Outside Diameter | 0.582 INCHES MINIMUM AND 0.587 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.505 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN |
| Under Flange Height | 0.238 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 2553-69-279 1-2IN | Velan Valve Corp. (USA) |
| 23399 ITEM 5 PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 23399 | D/9 Drawing number reference only Velan Valve Corp. |
| 2553-69-279 3-4 | C/1 Advisory reference — outside the item-of-supply concept Velan Valve Corp. |
NSN 4820-01-131-3145 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-131-3145 has 2 manufacturer part numbers on file: 2553-69-279 1-2IN (Velan Valve Corp.), 23399 ITEM 5 (Velan Valve Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-195-0377. Verify interchangeability with system specifications before substitution.
Key specifications for 23399 ITEM 5: Flange Seat to Disk End Height: 0.341 INCHES MINIMUM AND 0.342 INCHES MAXIMUM IN; Flange Diameter: 0.719 INCHES NOMINAL IN; Body Outside Diameter: 0.582 INCHES MINIMUM AND 0.587 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.