The Seat,valve, cataloged under National Stock Number 4820-01-464-6335, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Magnatrol Valve Corp Div Clark-Cooper. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-464-6335 |
| Primary Part Number | 640-21A |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Magnatrol Valve Corp Div Clark-Cooper |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 640-21A PRIMARY | Magnatrol Valve Corp Div Clark-Cooper (USA) |
| Reference | Meaning |
|---|---|
| ADV-665D ITEM 51 | 5/9 Secondary reference Magnatrol Valve Corp Div Clark-Cooper |
| ADV-665D | D/9 Drawing number reference only Magnatrol Valve Corp Div Clark-Cooper |
NSN 4820-01-464-6335 is a Seat,valve, manufactured by Magnatrol Valve Corp Div Clark-Cooper, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-464-6335 has 1 manufacturer part number on file: 640-21A (Magnatrol Valve Corp Div Clark-Cooper).
1 possible match (shared part number, not a government interchangeability claim): 4810-01-464-6338. Verify interchangeability with system specifications before substitution.
Key specifications for 640-21A: End Item Identification: E/I MODEL EV-1925, 2 1/2 INCH SOLENOID VALVE; W/S TARAWA CLASS LHA IN; Material: STEEL CORROSION RESISTING 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.