The Seat,valve, cataloged under National Stock Number 4820-01-049-3383, 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 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-049-3383 |
| Primary Part Number | 2551-8-69 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.328 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN |
| Flange Diameter | 0.500 INCHES NOMINAL IN |
| Body Outside Diameter | 0.351 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | ASTM-A276 ASSN STD 1ST MATERIAL RESPONSE OR ASTM-A479 ASSN STD 1ST MATERIAL RESPONSE BODY |
| Material Document and Classification | COMP STELLITE NO. 5 ASSN STD SINGLE MATERIAL RESPONSE FACE |
| Body Inside Diameter | 0.250 INCHES MINIMUM AND 0.257 INCHES MAXIMUM IN |
| Under Flange Height | 0.218 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN |
| Material | STEEL COMP 410 BODY |
| Material | STEEL AND COBALT FACE |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 23399PIECE5 3/8 | Velan Valve Corp. (USA) |
| 2551-8-69 PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 23399 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-049-3383 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-049-3383 has 2 manufacturer part numbers on file: 23399PIECE5 3/8 (Velan Valve Corp.), 2551-8-69 (Velan Valve Corp.).
Key specifications for 2551-8-69: Flange Seat to Disk End Height: 0.328 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN; Flange Diameter: 0.500 INCHES NOMINAL IN; Body Outside Diameter: 0.351 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 11 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.