The Seat,valve, cataloged under National Stock Number 4820-01-270-8565, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is William E Williams Valve Corp. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-270-8565 |
| Primary Part Number | 8468-4-3 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William E Williams Valve Corp |
| Status | ACTIVE |
| Style Designator | PLAIN |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| LHD8410 ITEM 3 | William E Williams Valve Corp (USA) |
| 8468-4-3 PRIMARY | William E Williams Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| LHD8410 | D/9 Drawing number reference only William E Williams Valve Corp |
NSN 4820-01-270-8565 is a Seat,valve, manufactured by William E Williams Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-270-8565 has 2 manufacturer part numbers on file: LHD8410 ITEM 3 (William E Williams Valve Corp), 8468-4-3 (William E Williams Valve Corp).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-271-1889. Verify interchangeability with system specifications before substitution.
Key specifications for 8468-4-3: Style Designator: PLAIN; End Item Identification: VALVE,GATE WILLIAM E. WILLIAMS CORP. 4.00 IN. SIZE IN; Material: STEEL OVERALL; Seating Surface Shape: FLAT. 3 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.