The Seat,valve, cataloged under National Stock Number 4820-01-398-8455, 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 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-398-8455 |
| Primary Part Number | 7542-701-209 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Body Outside Diameter | 3.657 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 3.000 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING SEAT |
| Seat Angle in Deg | 15.000 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 |
|---|---|
| 7542-701-209 PRIMARY | Velan Valve Corp. (USA) |
| 7370-050 ITEM 7 3IN | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 7370-050 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-398-8455 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-398-8455 has 2 manufacturer part numbers on file: 7542-701-209 (Velan Valve Corp.), 7370-050 ITEM 7 3IN (Velan Valve Corp.).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-415-3228, 4820-01-415-3234, 4820-01-538-6193. Verify interchangeability with system specifications before substitution.
Key specifications for 7542-701-209: Overall Height: 0.840 INCHES NOMINAL IN; Body Outside Diameter: 3.657 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 3.000 INCHES NOMINAL IN. 6 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.