The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-01-243-4204, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-243-4204 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Outside Diameter | 7.979 INCHES MINIMUM AND 7.989 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZY |
| Style Designator | SPECIAL SHAPED |
| Material Thickness | 0.167 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN |
| Material | STEEL CORROSION RESISTING |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 291187EMK30-12 | C/1 Advisory reference — outside the item-of-supply concept Babcock & Wilcox Co |
| 291187EMK30-12 | 3/9 Design control — primary reference The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
NSN 4820-01-243-4204 is a Diaphragm,actuator Valve,special, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-243-4204: Overall Height: 0.732 INCHES MINIMUM AND 0.768 INCHES MAXIMUM IN; Outside Diameter: 7.979 INCHES MINIMUM AND 7.989 INCHES MAXIMUM IN; Criticality Code Justification: ZZZY; Style Designator: SPECIAL SHAPED. 6 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.
NSN 4820-01-243-4204 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.