The Seat,valve, cataloged under National Stock Number 4820-01-555-8997, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-555-8997 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material | PLASTIC ACETAL SEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2640-801X1 PC 10 | 3/1 Design control — primary reference U.S. Government activity |
| 7383858-264274901-24 | 5/1 Secondary reference Naval Sea Systems Command |
| 2642-749-01 ITEM 24 | 5/1 Secondary reference U.S. Government activity |
| 845-4558733 ITEM 24 | 5/1 Secondary reference U.S. Government activity |
| H547-0001-264274901-24 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-555-8997 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-555-8997: Special Features: 5.967 X 3.937 X .750THK; Part Name Assigned by Controlling Agency: SEAT FOR 4.0 INCH BALL VALVE IN; End Item Identification: SSN774; Material: PLASTIC ACETAL 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.