The Valve,lift-Check, cataloged under National Stock Number 4820-00-971-3494, 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 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-971-3494 |
| Primary Part Number | 128N10000-3 |
| Item Name | Valve,lift-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Renewable Seat Ring Type | PRESSED-IN |
| Connection Style | GASKET SEAL (BOSS) FIRST END |
| Connection Type | THREADED INTERNAL BOSS FIRST END |
| Style Designator | OFFSET |
| Nominal Outside Diameter Tube Accommodated | 0.437 INCHES FIRST END IN |
| Bonnet Type | PACKING RETAINING |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.437 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Thread Class | 3B FIRST END |
| Thread Series Designator | UNF FIRST END |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 128N10000-3 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 128N10000-3 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 4820-00-971-3494 is a Valve,lift-Check, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-971-3494 has 1 manufacturer part number on file: 128N10000-3 (Northrop Grumman Systems Corporation).
Key specifications for 128N10000-3: Flow Control Device: POPPET; Renewable Seat Ring Type: PRESSED-IN; Connection Style: GASKET SEAL (BOSS) FIRST END; Connection Type: THREADED INTERNAL BOSS FIRST END. 13 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.