The Valve,butterfly, cataloged under National Stock Number 4820-01-290-4917, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Betts Industries, Inc.. Government technical data includes 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-290-4917 |
| Primary Part Number | WD401ALVB |
| Item Name | Valve,butterfly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Betts Industries, Inc. |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 5.875 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.438 INCHES ALL ENDS IN |
| Operating Pressure | 75.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 4.000 INCHES IN |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nominal Outside Diameter | 6.625 INCHES ALL ENDS IN |
| Mounting Facility | WAFER |
| Bolt Hole Quantity | 8 ALL ENDS |
| Face to Face Distance | 1.125 INCHES IN |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | ALUMINUM BODY |
| Material | RUBBER POLYMETHYLENE-PERFLUOROALKYLENE CLASS FKM FLOW CONTROL DEVICE |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 1.125 INCHES ALL ENDS IN |
| 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 |
|---|---|
| WD401ALVB PRIMARY | Betts Industries, Inc. (USA) |
| Reference | Meaning |
|---|---|
| WD401-AL-V | 5/9 Secondary reference Betts Industries, Inc. |
| 026664V | C/1 Advisory reference — outside the item-of-supply concept Kovatch Corp. |
NSN 4820-01-290-4917 is a Valve,butterfly, manufactured by Betts Industries, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-290-4917 has 1 manufacturer part number on file: WD401ALVB (Betts Industries, Inc.).
Key specifications for WD401ALVB: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 5.875 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS. 18 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.