The Valve,check, cataloged under National Stock Number 4820-01-491-2311, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Aerospace Systems and Components, Inc.. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-491-2311 |
| Primary Part Number | 4004-18 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Aerospace Systems and Components, Inc. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Bolt Circle Nominal Diameter | 4.625 INCHES ALL ENDS IN |
| Minimum Operating Temp | -65.0 FAHRENHEIT DEGF |
| Bolt Hole Nominal Diameter | 0.223 INCHES ALL ENDS IN |
| Operating Pressure | 15.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 300.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nominal Outside Diameter | 5.000 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 8 ALL ENDS |
| 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 |
|---|---|
| 4004-18 PRIMARY | Aerospace Systems and Components, Inc. (USA) |
NSN 4820-01-491-2311 is a Valve,check, manufactured by Aerospace Systems and Components, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-491-2311 has 1 manufacturer part number on file: 4004-18 (Aerospace Systems and Components, Inc.).
Key specifications for 4004-18: Flow Control Device: DISK; Bolt Circle Nominal Diameter: 4.625 INCHES ALL ENDS IN; Minimum Operating Temp: -65.0 FAHRENHEIT DEGF; Bolt Hole Nominal Diameter: 0.223 INCHES ALL ENDS IN. 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.
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.