The Seat,valve, cataloged under National Stock Number 4820-01-432-9306, 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 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-432-9306 |
| Primary Part Number | 8543-009-002S |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.937 INCHES NOMINAL IN |
| Flange Diameter | 4.895 INCHES NOMINAL IN |
| Body Outside Diameter | 4.500 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | ASTM A105,GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 4.000 INCHES NOMINAL IN |
| Under Flange Height | 0.102 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 30.000 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 |
|---|---|
| 8543-009-002S PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 83309-37 ITEM NO.4 | 5/1 Secondary reference Velan Valve Corp. |
| 83309-37 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-432-9306 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-432-9306 has 1 manufacturer part number on file: 8543-009-002S (Velan Valve Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-465-5266. Verify interchangeability with system specifications before substitution.
Key specifications for 8543-009-002S: Flange Seat to Disk End Height: 0.937 INCHES NOMINAL IN; Flange Diameter: 4.895 INCHES NOMINAL IN; Body Outside Diameter: 4.500 INCHES NOMINAL IN; Style Designator: PLAIN FLANGED. 10 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.