The Valve,expansion, cataloged under National Stock Number 4820-01-149-8552, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-149-8552 |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 3.219 INCHES NOMINAL IN |
| First End Style Designator | FLARED |
| Criticality Code Justification | ZZZY |
| End Connection Quantity | 2 |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Material | COPPER ALLOY BODY |
| 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 | C |
| Reference | Meaning |
|---|---|
| HC 1/2 FW | 3/1 Design control — primary reference Emerson Electric Co Alco Controls Div |
| 2670-57 PC33 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 503-4556027 PC 33 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 845-2445071ITEM33 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-149-8552 is a Valve,expansion, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-159-5876. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-149-8552: Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU; Face to Face Distance: 3.219 INCHES NOMINAL IN; First End Style Designator: FLARED. 9 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 4820-01-149-8552 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.