The Seat,valve, cataloged under National Stock Number 4820-01-284-2249, 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 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-284-2249 |
| Primary Part Number | LHD8656 PIECE 14 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William E Williams Valve Corp |
| Status | ACTIVE |
| Material | STEEL SEAT |
| 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 |
|---|---|
| S15F3 PIECE 14 | William E Williams Valve Corp (USA) |
| LHD8656 PIECE 14 PRIMARY | William E Williams Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| LHD 8656 | D/9 Drawing number reference only William E Williams Valve Corp |
| S15F3 | D/9 Drawing number reference only William E Williams Valve Corp |
NSN 4820-01-284-2249 is a Seat,valve, manufactured by William E Williams Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-284-2249 has 2 manufacturer part numbers on file: S15F3 PIECE 14 (William E Williams Valve Corp), LHD8656 PIECE 14 (William E Williams Valve Corp).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-284-4910. Verify interchangeability with system specifications before substitution.
Key specifications for LHD8656 PIECE 14: Special Features: BACK; VALVE SIZE 2.50 IN. IN; Material: STEEL SEAT. 1 specification is 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.