The Valve,check, cataloged under National Stock Number 4820-01-628-5677, 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 20 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-628-5677 |
| Primary Part Number | 4001-6 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Aerospace Systems and Components, Inc. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Nominal Pipe Size Accommodated | 3.0 INCHES FIRST END IN |
| Flange Face Design | PLAIN FIRST END |
| Connection Style | PLAIN (TUBE) FIRST END |
| Bolt Circle Nominal Diameter | 3.740 INCHES FIRST END IN |
| Minimum Operating Temp | -65.0 FAHRENHEIT DEGF |
| Connection Type | FLANGE FIRST END |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.199 INCHES FIRST END IN |
| Operating Pressure | 8.3 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 3.0 INCHES IN |
| Maximum Operating Temp | 160.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nominal Outside Diameter | 4.31 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Mounting Facility | WAFER |
| Bolt Hole Quantity | 8 FIRST END |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | ALUMINUM ALLOY BODY |
| 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 |
|---|---|
| 8SC0102-003 | De Havilland Aircraft of Canada Limited (CAN) |
| 4001-6 PRIMARY | Aerospace Systems and Components, Inc. (USA) |
NSN 4820-01-628-5677 is a Valve,check, manufactured by Aerospace Systems and Components, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-628-5677 has 2 manufacturer part numbers on file: 8SC0102-003 (De Havilland Aircraft of Canada Limited), 4001-6 (Aerospace Systems and Components, Inc.).
Key specifications for 4001-6: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES FIRST END; Nominal Pipe Size Accommodated: 3.0 INCHES FIRST END IN; Flange Face Design: PLAIN FIRST END. 20 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.