The Seat,valve, cataloged under National Stock Number 4820-01-195-0377, 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-195-0377 |
| Primary Part Number | 2557-073-062GS |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.764 INCHES NOMINAL IN |
| Flange Diameter | 1.844 INCHES NOMINAL IN |
| Body Outside Diameter | 1.625 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 1.505 INCHES NOMINAL IN |
| Under Flange Height | 0.383 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 |
|---|---|
| 2557-073-062GS PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 2557-73-279 | 5/9 Secondary reference Velan Valve Corp. |
| 23399 ITEM 5 | 5/1 Secondary reference Velan Valve Corp. |
| 23399 | 5/9 Secondary reference Velan Valve Corp. |
| 2557-073-302-S | 5/9 Secondary reference Velan Valve Corp. |
NSN 4820-01-195-0377 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-195-0377 has 1 manufacturer part number on file: 2557-073-062GS (Velan Valve Corp.).
Key specifications for 2557-073-062GS: Flange Seat to Disk End Height: 0.764 INCHES NOMINAL IN; Flange Diameter: 1.844 INCHES NOMINAL IN; Body Outside Diameter: 1.625 INCHES NOMINAL 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.