The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-451-7978, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-451-7978 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Pressure Rating | 120.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 4400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Temp Rating | 165.0 FAHRENHEIT MAXIMUM DEGF |
| Media for Which Designed | GAS OR LIQUID |
| Material | RUBBER |
| 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 |
|---|---|
| 126814-5 | 3/2 Design control — primary reference U.S. Government activity |
| 134600 | D/9 Drawing number reference only Circor Aerospace, Inc. Dba Circle Seal Controls Use CAGE Code 91816 for Cataloging |
NSN 4820-01-451-7978 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-451-7978: Pressure Rating: 120.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 4400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS; Temp Rating: 165.0 FAHRENHEIT MAXIMUM DEGF; Media for Which Designed: GAS OR LIQUID; End Item Identification: TARAWA CLASS LHA. 4 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.