The Valve,check, cataloged under National Stock Number 4820-01-015-5124, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-015-5124 |
| Primary Part Number | A51P9049-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Flange Shape | ROUND ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | FLANGE SECOND END |
| Connection Type | UNTHREADED EXTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 3.000 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.348 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Surface Treatment | PASSIVATE |
| Material | STEEL CORROSION RESISTING OVERALL |
| Nominal Thickness | 0.250 INCHES SECOND END IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AV18A1093-1 | Ge Aviation Systems Llc Dba Ge Aviation Systems Llc (USA) |
| A51P9049-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51P9049-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51P9049-1 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
NSN 4820-01-015-5124 is a Valve,check, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-015-5124 has 2 manufacturer part numbers on file: AV18A1093-1 (Ge Aviation Systems Llc Dba Ge Aviation Systems Llc), A51P9049-1 (Northrop Grumman Systems Corporation).
Key specifications for A51P9049-1: Flange Shape: ROUND ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: FLANGE SECOND END; Connection Type: UNTHREADED EXTERNAL TUBE FIRST END. 11 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 4820-01-015-5124 has DEMIL Code B. 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.