The Seat,valve, cataloged under National Stock Number 4820-01-531-0579, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is B N L Industries Inc. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-531-0579 |
| Primary Part Number | HBV-F3-24-0002ITEM6 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | B N L Industries Inc |
| Status | ACTIVE |
| Body Outside Diameter | 2.663 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 2.500 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Seat Angle in Deg | 0.345 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 |
|---|---|
| HBV-F3-24-0002ITEM6 PRIMARY | B N L Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| HBV-F3-24-0002 | D/9 Drawing number reference only B N L Industries Inc |
NSN 4820-01-531-0579 is a Seat,valve, manufactured by B N L Industries Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-531-0579 has 1 manufacturer part number on file: HBV-F3-24-0002ITEM6 (B N L Industries Inc).
Key specifications for HBV-F3-24-0002ITEM6: Overall Height: 0.240 INCHES NOMINAL IN; Body Outside Diameter: 2.663 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 2.500 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.